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Create branch ${ searchTerm }
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<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width"><meta name="theme-color" content="#222"><meta name="generator" content="Hexo 6.3.0"><link rel="preconnect" href="https://fonts.googleapis.com" crossorigin><link rel="preconnect" href="https://cdnjs.cloudflare.com" crossorigin><link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png"><link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png"><link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png"><link rel="mask-icon" href="/images/logo.svg" color="#222"><meta name="google-site-verification" content="2X6S9P7CAjXjVvw8YyQR8pCu-B0oEu7O9quLgxXuWyA"><meta name="baidu-site-verification" content="dV8JGNzi0c"><script>setTimeout(function(){var 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class="next-config" data-name="main" type="application/json">{"hostname":"nicksxs.me","root":"/","images":"/images","scheme":"Pisces","darkmode":false,"version":"8.12.1","exturl":false,"sidebar":{"position":"left","display":"post","padding":18,"offset":12},"copycode":{"enable":true,"style":"mac"},"bookmark":{"enable":false,"color":"#222","save":"auto"},"mediumzoom":false,"lazyload":true,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"stickytabs":false,"motion":{"enable":false,"async":false,"transition":{"post_block":"fadeIn","post_header":"fadeInDown","post_body":"fadeInDown","coll_header":"fadeInLeft","sidebar":"fadeInUp"}},"prism":false,"i18n":{"placeholder":"搜索...","empty":"没有找到任何搜索结果：${query}","hits_time":"找到 ${hits} 个搜索结果（用时 ${time} 毫秒）","hits":"找到 ${hits} 个搜索结果"},"path":"/search.xml","localsearch":{"enable":true,"trigger":"auto","top_n_per_article":1,"unescape":true,"preload":true}}</script><script src="/js/config.js"></script><meta name="description" content="learn from zero,技术博客，Nicksxs，史学森"><meta property="og:type" content="website"><meta property="og:title" content="Nicksxs&#39;s Blog"><meta property="og:url" content="https://nicksxs.me/index.html"><meta property="og:site_name" content="Nicksxs&#39;s Blog"><meta property="og:description" content="learn from zero,技术博客，Nicksxs，史学森"><meta property="og:locale" content="zh_CN"><meta property="article:author" content="Nicksxs"><meta property="article:tag" content="Nicksxs,史学森,米方方,米方方的男朋友,森哥"><meta name="twitter:card" content="summary"><link rel="canonical" href="https://nicksxs.me/"><script class="next-config" data-name="page" type="application/json">{"sidebar":"","isHome":true,"isPost":false,"lang":"zh-CN","comments":"","permalink":"","path":"index.html","title":""}</script><script class="next-config" data-name="calendar" type="application/json">""</script><title>Nicksxs's Blog - What hurts more, the pain of hard work or the pain of regret?</title><script async src="https://www.googletagmanager.com/gtag/js?id=UA-61358619-1"></script><script class="next-config" data-name="google_analytics" type="application/json">{"tracking_id":"UA-61358619-1","only_pageview":false}</script><script src="/js/third-party/analytics/google-analytics.js"></script><script src="/js/third-party/analytics/baidu-analytics.js"></script><script async src="https://hm.baidu.com/hm.js?20f33b3c0c0eff9b1522999c0015646d"></script><noscript><link rel="stylesheet" href="/css/noscript.css"></noscript><link rel="alternate" href="/atom.xml" title="Nicksxs's Blog" type="application/atom+xml"></head><body itemscope itemtype="http://schema.org/WebPage"><div class="headband"></div><main class="main"><header class="header" itemscope itemtype="http://schema.org/WPHeader"><div class="header-inner"><div class="site-brand-container"><div class="site-nav-toggle"><div class="toggle" aria-label="切换导航栏" role="button"><span class="toggle-line"></span> <span class="toggle-line"></span> <span class="toggle-line"></span></div></div><div class="site-meta"><a href="/" class="brand" rel="start"><i class="logo-line"></i><h1 class="site-title">Nicksxs's Blog</h1><i class="logo-line"></i></a><p class="site-subtitle" itemprop="description">What hurts more, the pain of hard work or the pain of regret?</p></div><div class="site-nav-right"><div class="toggle popup-trigger"><i class="fa fa-search fa-fw fa-lg"></i></div></div></div><nav class="site-nav"><ul class="main-menu menu"><li class="menu-item menu-item-home"><a href="/" rel="section"><i class="fa fa-home fa-fw"></i>首页</a></li><li class="menu-item menu-item-about"><a href="/about/" rel="section"><i class="fa fa-user fa-fw"></i>关于</a></li><li class="menu-item menu-item-tags"><a href="/tags/" rel="section"><i class="fa fa-tags fa-fw"></i>标签</a></li><li class="menu-item menu-item-categories"><a href="/categories/" rel="section"><i class="fa fa-th fa-fw"></i>分类</a></li><li class="menu-item menu-item-archives"><a href="/archives/" rel="section"><i class="fa fa-archive fa-fw"></i>归档</a></li><li class="menu-item menu-item-top"><a href="/top/" rel="section"><i class="fa fa-th fa-fw"></i>热度</a></li><li class="menu-item menu-item-sitemap"><a href="/sitemap.xml" rel="section"><i class="fa fa-sitemap fa-fw"></i>站点地图</a></li><li class="menu-item menu-item-commonweal"><a href="/404/" rel="section"><i class="fa fa-heartbeat fa-fw"></i>公益 404</a></li><li class="menu-item menu-item-search"><a role="button" class="popup-trigger"><i class="fa fa-search fa-fw"></i>搜索</a></li></ul></nav><div class="search-pop-overlay"><div class="popup search-popup"><div class="search-header"><span class="search-icon"><i class="fa fa-search"></i></span><div class="search-input-container"><input autocomplete="off" autocapitalize="off" maxlength="80" placeholder="搜索..." spellcheck="false" type="search" class="search-input"></div><span class="popup-btn-close" role="button"><i class="fa 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zero,技术博客，Nicksxs，史学森</div></div><div class="site-state-wrap site-overview-item animated"><nav class="site-state"><div class="site-state-item site-state-posts"><a href="/archives/"><span class="site-state-item-count">190</span> <span class="site-state-item-name">日志</span></a></div><div class="site-state-item site-state-categories"><a href="/categories/"><span class="site-state-item-count">148</span> <span class="site-state-item-name">分类</span></a></div><div class="site-state-item site-state-tags"><a href="/tags/"><span class="site-state-item-count">285</span> <span class="site-state-item-name">标签</span></a></div></nav></div><div class="links-of-author site-overview-item animated"><span class="links-of-author-item"><a href="https://github.com/nicksxs" title="GitHub → https:&#x2F;&#x2F;github.com&#x2F;nicksxs" rel="noopener" target="_blank"><i class="fab fa-github fa-fw"></i>GitHub</a> </span><span class="links-of-author-item"><a href="mailto:nicksxs1202@gmail.com" title="E-Mail → 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rel="tag">condition</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker/" rel="tag">docker</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/dp/" rel="tag">dp</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/dubbo/" rel="tag">dubbo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/echo/" rel="tag">echo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/environment/" rel="tag">environment</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gap-lock/" rel="tag">gap lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gc/" rel="tag">gc</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/git/" rel="tag">git</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/grep/" rel="tag">grep</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/hadoop/" rel="tag">hadoop</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/icu4c/" rel="tag">icu4c</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/im/" rel="tag">im</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-not-null/" rel="tag">is not null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-null/" rel="tag">is null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/j-u-c/" rel="tag">j.u.c</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/java/" rel="tag">java</a><span class="tag-list-count">33</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/jvm/" rel="tag">jvm</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode/" rel="tag">leetcode</a><span class="tag-list-count">40</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode-155/" rel="tag">leetcode 155</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linked-list/" rel="tag">linked list</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linux/" rel="tag">linux</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/lock/" rel="tag">lock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mfc/" rel="tag">mfc</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/min-stack/" rel="tag">min stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mq/" rel="tag">mq</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mvcc/" rel="tag">mvcc</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mysql/" rel="tag">mysql</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/namespace/" rel="tag">namespace</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/next-key-lock/" rel="tag">next-key lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nginx/" rel="tag">nginx</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nullsfirst/" rel="tag">nullsfirst</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/openresty/" rel="tag">openresty</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/php/" rel="tag">php</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/powershell/" rel="tag">powershell</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/procedure/" rel="tag">procedure</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/python/" rel="tag">python</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/read-view/" rel="tag">read view</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/redis/" rel="tag">redis</a><span class="tag-list-count">12</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/scp/" rel="tag">scp</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/signal/" rel="tag">signal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sort/" rel="tag">sort</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spark/" rel="tag">spark</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ssh/" rel="tag">ssh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stack/" rel="tag">stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stream/" rel="tag">stream</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/string/" rel="tag">string</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/swoole/" rel="tag">swoole</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/top/" rel="tag">top</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/uname/" rel="tag">uname</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/unlock/" rel="tag">unlock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8/" rel="tag">utf8</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4/" rel="tag">utf8mb4</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-0900-ai-ci/" rel="tag">utf8mb4_0900_ai_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-general-ci/" rel="tag">utf8mb4_general_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-unicode-ci/" rel="tag">utf8mb4_unicode_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/value/" rel="tag">value</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/websocket/" rel="tag">websocket</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zookeeper/" rel="tag">zookeeper</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zsh/" rel="tag">zsh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">三阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">不可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/" rel="tag">东京奥运会</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">两阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/" rel="tag">中山路</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%BA%8F/" rel="tag">中序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/" rel="tag">中间件</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%BE%E9%87%8D/" rel="tag">举重</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B9%92%E4%B9%93%E7%90%83/" rel="tag">乒乓球</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8B%E5%8A%A1/" rel="tag">事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/" rel="tag">二叉树</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%92%E6%96%A5%E9%94%81/" rel="tag">互斥锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/" rel="tag">代码题解</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/" rel="tag">修电脑的</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%8F%E5%90%91%E9%94%81/" rel="tag">偏向锁</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/" rel="tag">健康码</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4/" rel="tag">公交</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/" rel="tag">公交车</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/" rel="tag">内存分布</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" rel="tag">内存泄漏</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%86%E5%A4%87/" rel="tag">准备</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%8F%E8%82%A5/" rel="tag">减肥</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E4%BA%8B%E5%8A%A1/" rel="tag">分布式事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/" rel="tag">分布式锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%87%E7%89%87/" rel="tag">切片</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/" rel="tag">初始化</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8A%E5%B3%B0%E5%A1%AB%E8%B0%B7/" rel="tag">削峰填谷</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8D%E5%BA%8F/" rel="tag">前序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E5%A1%9E/" rel="tag">加塞</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E8%BD%BD/" rel="tag">加载</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%95%E4%BE%8B/" rel="tag">单例</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/" rel="tag">博客，文章</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8E%A6%E9%97%A8/" rel="tag">厦门</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE/" rel="tag">双亲委派</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%91%E8%A1%8C%E7%89%88/" rel="tag">发行版</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%A3%E7%BD%A9/" rel="tag">口罩</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%90%90%E6%A7%BD/" rel="tag">吐槽</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9B%A4%E7%89%A9%E8%B5%84/" rel="tag">囤物资</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/" rel="tag">垃圾回收</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9F%BA%E7%A1%80%E8%AE%BE%E6%96%BD/" rel="tag">基础设施</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%A4%A7%E6%89%AB%E9%99%A4/" rel="tag">大扫除</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AD%97%E7%AC%A6%E9%9B%86/" rel="tag">字符集</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%89%E5%85%A8/" rel="tag">安全</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/" rel="tag">容错机制</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AF%84%E7%94%9F%E8%99%AB/" rel="tag">寄生虫</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%84%E5%87%BB/" rel="tag">射击</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/" rel="tag">小技巧</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B1%80%E5%8F%A3%E8%A1%97/" rel="tag">局口街</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B8%83%E9%9A%86%E8%BF%87%E6%BB%A4%E5%99%A8/" rel="tag">布隆过滤器</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B2%E6%B4%BB/" rel="tag">干活</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" rel="tag">年中总结</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/" rel="tag">年终总结</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B6%E5%8F%91/" rel="tag">并发</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B8%E7%A6%8F%E4%BA%86%E5%90%97/" rel="tag">幸福了吗</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%BB%E8%AF%BB/" rel="tag">幻读</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BA%94%E7%94%A8/" rel="tag">应用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a 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itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a> </span></span><span id="/2022/12/18/mybatis%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E6%9D%A1sql%E7%9A%84%E6%9B%B4%E5%A4%9A%E7%BB%86%E8%8A%82/" class="post-meta-item leancloud_visitors" data-flag-title="mybatis系列-第一条sql的更多细节" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2022/12/18/mybatis%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E6%9D%A1sql%E7%9A%84%E6%9B%B4%E5%A4%9A%E7%BB%86%E8%8A%82/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2022/12/18/mybatis系列-第一条sql的更多细节/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>执行细节<br>首先设置了默认的<code>languageDriver</code><br><code>org/mybatis/mybatis/3.5.11/mybatis-3.5.11-sources.jar!/org/apache/ibatis/session/Configuration.java:215</code><br>在<code>configuration</code>的构造方法里</p><pre class="line-numbers language-java" data-language="java"><code class="language-java">languageRegistry<span class="token punctuation">.</span><span class="token function">setDefaultDriverClass</span><span class="token punctuation">(</span><span class="token class-name">XMLLanguageDriver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p>而在<br><code>org.apache.ibatis.builder.xml.XMLStatementBuilder#parseStatementNode</code><br>中，创建了<code>sqlSource</code>，这里就会根据前面的 <code>LanguageDriver</code> 的实现选择对应的 <code>sqlSource</code> ，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token class-name">SqlSource</span> sqlSource <span class="token operator">=</span> langDriver<span class="token punctuation">.</span><span class="token function">createSqlSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> context<span class="token punctuation">,</span> parameterTypeClass<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p><code>createSqlSource</code> 就会调用</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">SqlSource</span> <span class="token function">createSqlSource</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> configuration<span class="token punctuation">,</span> <span class="token class-name">XNode</span> script<span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">XMLScriptBuilder</span> builder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLScriptBuilder</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> script<span class="token punctuation">,</span> parameterType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> builder<span class="token punctuation">.</span><span class="token function">parseScriptNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>再往下的逻辑在 <code>parseScriptNode</code> 中，<code>org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseScriptNode</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">SqlSource</span> <span class="token function">parseScriptNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">MixedSqlNode</span> rootSqlNode <span class="token operator">=</span> <span class="token function">parseDynamicTags</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">SqlSource</span> sqlSource<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>isDynamic<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
sqlSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DynamicSqlSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> rootSqlNode<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
sqlSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">RawSqlSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> rootSqlNode<span class="token punctuation">,</span> parameterType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> sqlSource<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>首先要解析<code>dynamicTag</code>，调用了<code>org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseDynamicTags</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">protected</span> <span class="token class-name">MixedSqlNode</span> <span class="token function">parseDynamicTags</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> node<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">SqlNode</span><span class="token punctuation">></span></span> contents <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">NodeList</span> children <span class="token operator">=</span> node<span class="token punctuation">.</span><span class="token function">getNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getChildNodes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> children<span class="token punctuation">.</span><span class="token function">getLength</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">XNode</span> child <span class="token operator">=</span> node<span class="token punctuation">.</span><span class="token function">newXNode</span><span class="token punctuation">(</span>children<span class="token punctuation">.</span><span class="token function">item</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">getNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getNodeType</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">Node</span><span class="token punctuation">.</span><span class="token constant">CDATA_SECTION_NODE</span> <span class="token operator">||</span> child<span class="token punctuation">.</span><span class="token function">getNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getNodeType</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">Node</span><span class="token punctuation">.</span><span class="token constant">TEXT_NODE</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> data <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getStringBody</span><span class="token punctuation">(</span><span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">TextSqlNode</span> textSqlNode <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TextSqlNode</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// ---------> 主要是这边的逻辑</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>textSqlNode<span class="token punctuation">.</span><span class="token function">isDynamic</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
contents<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>textSqlNode<span class="token punctuation">)</span><span class="token punctuation">;</span>
isDynamic <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
contents<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">StaticTextSqlNode</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">getNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getNodeType</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">Node</span><span class="token punctuation">.</span><span class="token constant">ELEMENT_NODE</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span> <span class="token comment">// issue #628</span>
<span class="token class-name">String</span> nodeName <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getNodeName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">NodeHandler</span> handler <span class="token operator">=</span> nodeHandlerMap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>nodeName<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>handler <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Unknown element &lt;"</span> <span class="token operator">+</span> nodeName <span class="token operator">+</span> <span class="token string">"> in SQL statement."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
handler<span class="token punctuation">.</span><span class="token function">handleNode</span><span class="token punctuation">(</span>child<span class="token punctuation">,</span> contents<span class="token punctuation">)</span><span class="token punctuation">;</span>
isDynamic <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">MixedSqlNode</span><span class="token punctuation">(</span>contents<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>判断是否是动态<code>sql</code>，调用了<code>org.apache.ibatis.scripting.xmltags.TextSqlNode#isDynamic</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">isDynamic</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">DynamicCheckerTokenParser</span> checker <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DynamicCheckerTokenParser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// ----------> 主要是这里的方法</span>
<span class="token class-name">GenericTokenParser</span> parser <span class="token operator">=</span> <span class="token function">createParser</span><span class="token punctuation">(</span>checker<span class="token punctuation">)</span><span class="token punctuation">;</span>
parser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>text<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> checker<span class="token punctuation">.</span><span class="token function">isDynamic</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>创建<code>parser</code>的时候可以看到这个<code>parser</code>是干了啥，其实就是找有没有<code>$&#123;</code> , <code>&#125;</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token class-name">GenericTokenParser</span> <span class="token function">createParser</span><span class="token punctuation">(</span><span class="token class-name">TokenHandler</span> handler<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">GenericTokenParser</span><span class="token punctuation">(</span><span class="token string">"$&#123;"</span><span class="token punctuation">,</span> <span class="token string">"&#125;"</span><span class="token punctuation">,</span> handler<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><p>如果是的话，就在上面把 <code>isDynamic</code> 设置为<code>true</code> 如果是<code>true</code> 的话就创建 <code>DynamicSqlSource</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java">sqlSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DynamicSqlSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> rootSqlNode<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p>如果不是的话就创建<code>RawSqlSource</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java">sqlSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">RawSqlSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> rootSqlNode<span class="token punctuation">,</span> parameterType<span class="token punctuation">)</span><span class="token punctuation">;</span>
```java
但是这不是一个真实可用的 `sqlSource` ，
实际创建的时候会走到这
```java
<span class="token keyword">public</span> <span class="token class-name">RawSqlSource</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> configuration<span class="token punctuation">,</span> <span class="token class-name">SqlNode</span> rootSqlNode<span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> <span class="token function">getSql</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> rootSqlNode<span class="token punctuation">)</span><span class="token punctuation">,</span> parameterType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token class-name">RawSqlSource</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> configuration<span class="token punctuation">,</span> <span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">SqlSourceBuilder</span> sqlSourceParser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SqlSourceBuilder</span><span class="token punctuation">(</span>configuration<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> clazz <span class="token operator">=</span> parameterType <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token class-name">Object</span><span class="token punctuation">.</span><span class="token keyword">class</span> <span class="token operator">:</span> parameterType<span class="token punctuation">;</span>
sqlSource <span class="token operator">=</span> sqlSourceParser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>sql<span class="token punctuation">,</span> clazz<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>具体的<code>sqlSource</code>是通过<code>org.apache.ibatis.builder.SqlSourceBuilder#parse</code> 创建的<br>具体的代码逻辑是</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">SqlSource</span> <span class="token function">parse</span><span class="token punctuation">(</span><span class="token class-name">String</span> originalSql<span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">,</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">></span></span> additionalParameters<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ParameterMappingTokenHandler</span> handler <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ParameterMappingTokenHandler</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> parameterType<span class="token punctuation">,</span> additionalParameters<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">GenericTokenParser</span> parser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">GenericTokenParser</span><span class="token punctuation">(</span><span class="token string">"#&#123;"</span><span class="token punctuation">,</span> <span class="token string">"&#125;"</span><span class="token punctuation">,</span> handler<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> sql<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>configuration<span class="token punctuation">.</span><span class="token function">isShrinkWhitespacesInSql</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
sql <span class="token operator">=</span> parser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token function">removeExtraWhitespaces</span><span class="token punctuation">(</span>originalSql<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
sql <span class="token operator">=</span> parser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>originalSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">StaticSqlSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> sql<span class="token punctuation">,</span> handler<span class="token punctuation">.</span><span class="token function">getParameterMappings</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里创建的其实是<code>StaticSqlSource</code> ,多带一句前面的<code>parser</code>是将原来这样<code>select * from student where id = #&#123;id&#125;</code> 的 <code>sql</code> 解析成了<code>select * from student where id = ?</code> 然后创建了<code>StaticSqlSource</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">StaticSqlSource</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> configuration<span class="token punctuation">,</span> <span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">ParameterMapping</span><span class="token punctuation">></span></span> parameterMappings<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>sql <span class="token operator">=</span> sql<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>parameterMappings <span class="token operator">=</span> parameterMappings<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>configuration <span class="token operator">=</span> configuration<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>为什么前面要讲这么多好像没什么关系的代码呢，其实在最开始我们执行<code>sql</code>的代码中</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameterObject<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">BoundSql</span> boundSql <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getBoundSql</span><span class="token punctuation">(</span>parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">CacheKey</span> key <span class="token operator">=</span> <span class="token function">createCacheKey</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里获取了<code>BoundSql</code>，而<code>BoundSql</code>是怎么来的呢，首先调用了<code>org.apache.ibatis.mapping.MappedStatement#getBoundSql</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">BoundSql</span> <span class="token function">getBoundSql</span><span class="token punctuation">(</span><span class="token class-name">Object</span> parameterObject<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">BoundSql</span> boundSql <span class="token operator">=</span> sqlSource<span class="token punctuation">.</span><span class="token function">getBoundSql</span><span class="token punctuation">(</span>parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">ParameterMapping</span><span class="token punctuation">></span></span> parameterMappings <span class="token operator">=</span> boundSql<span class="token punctuation">.</span><span class="token function">getParameterMappings</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>parameterMappings <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> parameterMappings<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
boundSql <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BoundSql</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> boundSql<span class="token punctuation">.</span><span class="token function">getSql</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> parameterMap<span class="token punctuation">.</span><span class="token function">getParameterMappings</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// check for nested result maps in parameter mappings (issue #30)</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">ParameterMapping</span> pm <span class="token operator">:</span> boundSql<span class="token punctuation">.</span><span class="token function">getParameterMappings</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> rmId <span class="token operator">=</span> pm<span class="token punctuation">.</span><span class="token function">getResultMapId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>rmId <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ResultMap</span> rm <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">getResultMap</span><span class="token punctuation">(</span>rmId<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>rm <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
hasNestedResultMaps <span class="token operator">|=</span> rm<span class="token punctuation">.</span><span class="token function">hasNestedResultMaps</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> boundSql<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而我们从上面的解析中可以看到这里的<code>sqlSource</code>是一层<code>RawSqlSource</code> , 它的<code>getBoundSql</code>又是调用内部的<code>sqlSource</code>的方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">BoundSql</span> <span class="token function">getBoundSql</span><span class="token punctuation">(</span><span class="token class-name">Object</span> parameterObject<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> sqlSource<span class="token punctuation">.</span><span class="token function">getBoundSql</span><span class="token punctuation">(</span>parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><p>内部的<code>sqlSource</code> 就是<code>StaticSqlSource</code> ，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">BoundSql</span> <span class="token function">getBoundSql</span><span class="token punctuation">(</span><span class="token class-name">Object</span> parameterObject<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">BoundSql</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> sql<span class="token punctuation">,</span> parameterMappings<span class="token punctuation">,</span> parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><p>这个<code>BoundSql</code>的内容也比较简单</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">BoundSql</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> configuration<span class="token punctuation">,</span> <span class="token class-name">String</span> sql<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">ParameterMapping</span><span class="token punctuation">></span></span> parameterMappings<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameterObject<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>sql <span class="token operator">=</span> sql<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>parameterMappings <span class="token operator">=</span> parameterMappings<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>parameterObject <span class="token operator">=</span> parameterObject<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>additionalParameters <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>metaParameters <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">newMetaObject</span><span class="token punctuation">(</span>additionalParameters<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而上次在这边<code>org.apache.ibatis.executor.SimpleExecutor#doQuery</code> 的时候落了个东西，就是<code>StatementHandler</code>的逻辑</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">doQuery</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Statement</span> stmt <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Configuration</span> configuration <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getConfiguration</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">StatementHandler</span> handler <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">newStatementHandler</span><span class="token punctuation">(</span>wrapper<span class="token punctuation">,</span> ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
stmt <span class="token operator">=</span> <span class="token function">prepareStatement</span><span class="token punctuation">(</span>handler<span class="token punctuation">,</span> ms<span class="token punctuation">.</span><span class="token function">getStatementLog</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> handler<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>stmt<span class="token punctuation">,</span> resultHandler<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token function">closeStatement</span><span class="token punctuation">(</span>stmt<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>它是通过statementType来区分应该使用哪个statementHandler，我们这使用的就是PreparedStatementHandler</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">RoutingStatementHandler</span><span class="token punctuation">(</span><span class="token class-name">Executor</span> executor<span class="token punctuation">,</span> <span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getStatementType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">case</span> <span class="token constant">STATEMENT</span><span class="token operator">:</span>
delegate <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SimpleStatementHandler</span><span class="token punctuation">(</span>executor<span class="token punctuation">,</span> ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token constant">PREPARED</span><span class="token operator">:</span>
delegate <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PreparedStatementHandler</span><span class="token punctuation">(</span>executor<span class="token punctuation">,</span> ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token constant">CALLABLE</span><span class="token operator">:</span>
delegate <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CallableStatementHandler</span><span class="token punctuation">(</span>executor<span class="token punctuation">,</span> ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">ExecutorException</span><span class="token punctuation">(</span><span class="token string">"Unknown statement type: "</span> <span class="token operator">+</span> ms<span class="token punctuation">.</span><span class="token function">getStatementType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>所以上次有个细节可以补充，这边的doQuery里面的handler.query 应该是调用了PreparedStatementHandler 的query方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">doQuery</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Statement</span> stmt <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Configuration</span> configuration <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getConfiguration</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">StatementHandler</span> handler <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">newStatementHandler</span><span class="token punctuation">(</span>wrapper<span class="token punctuation">,</span> ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
stmt <span class="token operator">=</span> <span class="token function">prepareStatement</span><span class="token punctuation">(</span>handler<span class="token punctuation">,</span> ms<span class="token punctuation">.</span><span class="token function">getStatementLog</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> handler<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>stmt<span class="token punctuation">,</span> resultHandler<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token function">closeStatement</span><span class="token punctuation">(</span>stmt<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>因为上面prepareStatement中getConnection拿到connection是com.mysql.cj.jdbc.ConnectionImpl#ConnectionImpl(com.mysql.cj.conf.HostInfo)</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">Statement</span> statement<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">PreparedStatement</span> ps <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">PreparedStatement</span><span class="token punctuation">)</span> statement<span class="token punctuation">;</span>
ps<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> resultSetHandler<span class="token punctuation">.</span><span class="token function">handleResultSets</span><span class="token punctuation">(</span>ps<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>那又为什么是这个呢，可以在网上找，我们在mybatis-config.xml里配置的</p><pre class="line-numbers language-markup" data-language="markup"><code class="language-markup"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>transactionManager</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>JDBC<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p>因此在parseConfiguration中配置environment时</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">parseConfiguration</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> root<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// issue #117 read properties first</span>
<span class="token function">propertiesElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"properties"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Properties</span> settings <span class="token operator">=</span> <span class="token function">settingsAsProperties</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"settings"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">loadCustomVfs</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">loadCustomLogImpl</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">typeAliasesElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"typeAliases"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pluginElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"plugins"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">objectFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"objectFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">objectWrapperFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"objectWrapperFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">reflectorFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"reflectorFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">settingsElement</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// read it after objectFactory and objectWrapperFactory issue #631</span>
<span class="token comment">// ----------> 就是这里</span>
<span class="token function">environmentsElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"environments"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">databaseIdProviderElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"databaseIdProvider"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">typeHandlerElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"typeHandlers"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">mapperElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"mappers"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Error parsing SQL Mapper Configuration. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>调用的这个方法通过获取xml中的transactionManager 配置的类型，也就是JDBC</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">environmentsElement</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> context<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>context <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>environment <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
environment <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"default"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">XNode</span> child <span class="token operator">:</span> context<span class="token punctuation">.</span><span class="token function">getChildren</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> id <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isSpecifiedEnvironment</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// -------> 找到这里</span>
<span class="token class-name">TransactionFactory</span> txFactory <span class="token operator">=</span> <span class="token function">transactionManagerElement</span><span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"transactionManager"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">DataSourceFactory</span> dsFactory <span class="token operator">=</span> <span class="token function">dataSourceElement</span><span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"dataSource"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">DataSource</span> dataSource <span class="token operator">=</span> dsFactory<span class="token punctuation">.</span><span class="token function">getDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Environment<span class="token punctuation">.</span>Builder</span> environmentBuilder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Environment<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">transactionFactory</span><span class="token punctuation">(</span>txFactory<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">dataSource</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">)</span><span class="token punctuation">;</span>
configuration<span class="token punctuation">.</span><span class="token function">setEnvironment</span><span class="token punctuation">(</span>environmentBuilder<span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>是通过以下方法获取的，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 方法全限定名 org.apache.ibatis.builder.xml.XMLConfigBuilder#transactionManagerElement</span>
<span class="token keyword">private</span> <span class="token class-name">TransactionFactory</span> <span class="token function">transactionManagerElement</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> context<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>context <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> type <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"type"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Properties</span> props <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getChildrenAsProperties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">TransactionFactory</span> factory <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">TransactionFactory</span><span class="token punctuation">)</span> <span class="token function">resolveClass</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getDeclaredConstructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">newInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
factory<span class="token punctuation">.</span><span class="token function">setProperties</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> factory<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Environment declaration requires a TransactionFactory."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 方法全限定名 org.apache.ibatis.builder.BaseBuilder#resolveClass</span>
<span class="token keyword">protected</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token function">resolveClass</span><span class="token punctuation">(</span><span class="token class-name">String</span> alias<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>alias <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token function">resolveAlias</span><span class="token punctuation">(</span>alias<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Error resolving class. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 方法全限定名 org.apache.ibatis.builder.BaseBuilder#resolveAlias</span>
<span class="token keyword">protected</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token function">resolveAlias</span><span class="token punctuation">(</span><span class="token class-name">String</span> alias<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> typeAliasRegistry<span class="token punctuation">.</span><span class="token function">resolveAlias</span><span class="token punctuation">(</span>alias<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 方法全限定名 org.apache.ibatis.type.TypeAliasRegistry#resolveAlias</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token function">resolveAlias</span><span class="token punctuation">(</span><span class="token class-name">String</span> string<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>string <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// issue #748</span>
<span class="token class-name">String</span> key <span class="token operator">=</span> string<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token class-name">Locale</span><span class="token punctuation">.</span><span class="token constant">ENGLISH</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span> value<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>typeAliases<span class="token punctuation">.</span><span class="token function">containsKey</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
value <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> typeAliases<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
value <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> <span class="token class-name">Resources</span><span class="token punctuation">.</span><span class="token function">classForName</span><span class="token punctuation">(</span>string<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> value<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">ClassNotFoundException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeException</span><span class="token punctuation">(</span><span class="token string">"Could not resolve type alias '"</span> <span class="token operator">+</span> string <span class="token operator">+</span> <span class="token string">"'. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而通过JDBC获取得是啥的，就是在Configuration的构造方法里写了的JdbcTransactionFactory</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">Configuration</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JDBC"</span><span class="token punctuation">,</span> <span class="token class-name">JdbcTransactionFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre><p>所以我们在这</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token class-name">SqlSession</span> <span class="token function">openSessionFromDataSource</span><span class="token punctuation">(</span><span class="token class-name">ExecutorType</span> execType<span class="token punctuation">,</span> <span class="token class-name">TransactionIsolationLevel</span> level<span class="token punctuation">,</span> <span class="token keyword">boolean</span> autoCommit<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Transaction</span> tx <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">final</span> <span class="token class-name">Environment</span> environment <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">getEnvironment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token class-name">TransactionFactory</span> transactionFactory <span class="token operator">=</span> <span class="token function">getTransactionFactoryFromEnvironment</span><span class="token punctuation">(</span>environment<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>获得到的TransactionFactory 就是 JdbcTransactionFactory ，而后</p><pre class="line-numbers language-java" data-language="java"><code class="language-java">tx <span class="token operator">=</span> transactionFactory<span class="token punctuation">.</span><span class="token function">newTransaction</span><span class="token punctuation">(</span>environment<span class="token punctuation">.</span><span class="token function">getDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> level<span class="token punctuation">,</span> autoCommit<span class="token punctuation">)</span><span class="token punctuation">;</span>
```java
创建的transaction就是<span class="token class-name">JdbcTransaction</span>
```java
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">Transaction</span> <span class="token function">newTransaction</span><span class="token punctuation">(</span><span class="token class-name">DataSource</span> ds<span class="token punctuation">,</span> <span class="token class-name">TransactionIsolationLevel</span> level<span class="token punctuation">,</span> <span class="token keyword">boolean</span> autoCommit<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">JdbcTransaction</span><span class="token punctuation">(</span>ds<span class="token punctuation">,</span> level<span class="token punctuation">,</span> autoCommit<span class="token punctuation">,</span> skipSetAutoCommitOnClose<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后我们再会上去看代码getConnection ,</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">protected</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token class-name">Log</span> statementLog<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// -------> 这里的transaction就是JdbcTransaction</span>
<span class="token class-name">Connection</span> connection <span class="token operator">=</span> transaction<span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>statementLog<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token class-name">ConnectionLogger</span><span class="token punctuation">.</span><span class="token function">newInstance</span><span class="token punctuation">(</span>connection<span class="token punctuation">,</span> statementLog<span class="token punctuation">,</span> queryStack<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> connection<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>即调用了</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"> <span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>connection <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">openConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> connection<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">openConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Opening JDBC Connection"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
connection <span class="token operator">=</span> dataSource<span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>level <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
connection<span class="token punctuation">.</span><span class="token function">setTransactionIsolation</span><span class="token punctuation">(</span>level<span class="token punctuation">.</span><span class="token function">getLevel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">setDesiredAutoCommit</span><span class="token punctuation">(</span>autoCommit<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token function">popConnection</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">.</span><span class="token function">getUsername</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> dataSource<span class="token punctuation">.</span><span class="token function">getPassword</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getProxyConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">private</span> <span class="token class-name">PooledConnection</span> <span class="token function">popConnection</span><span class="token punctuation">(</span><span class="token class-name">String</span> username<span class="token punctuation">,</span> <span class="token class-name">String</span> password<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">boolean</span> countedWait <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token class-name">PooledConnection</span> conn <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">long</span> t <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> localBadConnectionCount <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>conn <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
lock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>state<span class="token punctuation">.</span>idleConnections<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Pool has available connection</span>
conn <span class="token operator">=</span> state<span class="token punctuation">.</span>idleConnections<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Checked out connection "</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" from pool."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Pool does not have available connection</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&lt;</span> poolMaximumActiveConnections<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Can create new connection</span>
<span class="token comment">// ------------> 走到这里会创建PooledConnection，但是里面会先调用dataSource.getConnection()</span>
conn <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PooledConnection</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Created connection "</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Cannot create new connection</span>
<span class="token class-name">PooledConnection</span> oldestActiveConnection <span class="token operator">=</span> state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">long</span> longestCheckoutTime <span class="token operator">=</span> oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getCheckoutTime</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>longestCheckoutTime <span class="token operator">></span> poolMaximumCheckoutTime<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Can claim overdue connection</span>
state<span class="token punctuation">.</span>claimedOverdueConnectionCount<span class="token operator">++</span><span class="token punctuation">;</span>
state<span class="token punctuation">.</span>accumulatedCheckoutTimeOfOverdueConnections <span class="token operator">+=</span> longestCheckoutTime<span class="token punctuation">;</span>
state<span class="token punctuation">.</span>accumulatedCheckoutTime <span class="token operator">+=</span> longestCheckoutTime<span class="token punctuation">;</span>
state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAutoCommit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rollback</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">SQLException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">/*
Just log a message for debug and continue to execute the following
statement like nothing happened.
Wrap the bad connection with a new PooledConnection, this will help
to not interrupt current executing thread and give current thread a
chance to join the next competition for another valid/good database
connection. At the end of this loop, bad &#123;@link @conn&#125; will be set as null.
*/</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Bad connection. Could not roll back"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
conn <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PooledConnection</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
conn<span class="token punctuation">.</span><span class="token function">setCreatedTimestamp</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getCreatedTimestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
conn<span class="token punctuation">.</span><span class="token function">setLastUsedTimestamp</span><span class="token punctuation">(</span>oldestActiveConnection<span class="token punctuation">.</span><span class="token function">getLastUsedTimestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
oldestActiveConnection<span class="token punctuation">.</span><span class="token function">invalidate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Claimed overdue connection "</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Must wait</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>countedWait<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
state<span class="token punctuation">.</span>hadToWaitCount<span class="token operator">++</span><span class="token punctuation">;</span>
countedWait <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"Waiting as long as "</span> <span class="token operator">+</span> poolTimeToWait <span class="token operator">+</span> <span class="token string">" milliseconds for connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">long</span> wt <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
condition<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span>poolTimeToWait<span class="token punctuation">,</span> <span class="token class-name">TimeUnit</span><span class="token punctuation">.</span><span class="token constant">MILLISECONDS</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
state<span class="token punctuation">.</span>accumulatedWaitTime <span class="token operator">+=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> wt<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// set interrupt flag</span>
<span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">interrupt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>conn <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// ping to server and check the connection is valid or not</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>conn<span class="token punctuation">.</span><span class="token function">isValid</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>conn<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAutoCommit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
conn<span class="token punctuation">.</span><span class="token function">getRealConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rollback</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
conn<span class="token punctuation">.</span><span class="token function">setConnectionTypeCode</span><span class="token punctuation">(</span><span class="token function">assembleConnectionTypeCode</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">.</span><span class="token function">getUrl</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> username<span class="token punctuation">,</span> password<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
conn<span class="token punctuation">.</span><span class="token function">setCheckoutTimestamp</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
conn<span class="token punctuation">.</span><span class="token function">setLastUsedTimestamp</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
state<span class="token punctuation">.</span>activeConnections<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>conn<span class="token punctuation">)</span><span class="token punctuation">;</span>
state<span class="token punctuation">.</span>requestCount<span class="token operator">++</span><span class="token punctuation">;</span>
state<span class="token punctuation">.</span>accumulatedRequestTime <span class="token operator">+=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> t<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"A bad connection ("</span> <span class="token operator">+</span> conn<span class="token punctuation">.</span><span class="token function">getRealHashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">") was returned from the pool, getting another connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
state<span class="token punctuation">.</span>badConnectionCount<span class="token operator">++</span><span class="token punctuation">;</span>
localBadConnectionCount<span class="token operator">++</span><span class="token punctuation">;</span>
conn <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>localBadConnectionCount <span class="token operator">></span> <span class="token punctuation">(</span>poolMaximumIdleConnections <span class="token operator">+</span> poolMaximumLocalBadConnectionTolerance<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Could not get a good connection to the database."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">SQLException</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Could not get a good connection to the database."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
lock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>conn <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isDebugEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Unknown severe error condition. The connection pool returned a null connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">SQLException</span><span class="token punctuation">(</span><span class="token string">"PooledDataSource: Unknown severe error condition. The connection pool returned a null connection."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> conn<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>其实就是调用的</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// org.apache.ibatis.datasource.unpooled.UnpooledDataSource#getConnection()</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span>username<span class="token punctuation">,</span> password<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
```java
然后就是
```java
<span class="token keyword">private</span> <span class="token class-name">Connection</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span><span class="token class-name">String</span> username<span class="token punctuation">,</span> <span class="token class-name">String</span> password<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Properties</span> props <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Properties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>driverProperties <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
props<span class="token punctuation">.</span><span class="token function">putAll</span><span class="token punctuation">(</span>driverProperties<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>username <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
props<span class="token punctuation">.</span><span class="token function">setProperty</span><span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">,</span> username<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>password <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
props<span class="token punctuation">.</span><span class="token function">setProperty</span><span class="token punctuation">(</span><span class="token string">"password"</span><span class="token punctuation">,</span> password<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>继续这个逻辑</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"> <span class="token keyword">private</span> <span class="token class-name">Connection</span> <span class="token function">doGetConnection</span><span class="token punctuation">(</span><span class="token class-name">Properties</span> properties<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token function">initializeDriver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Connection</span> connection <span class="token operator">=</span> <span class="token class-name">DriverManager</span><span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span> properties<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">configureConnection</span><span class="token punctuation">(</span>connection<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> connection<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token annotation punctuation">@CallerSensitive</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token class-name">String</span> url<span class="token punctuation">,</span>
<span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span>Properties</span> info<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token function">getConnection</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span> info<span class="token punctuation">,</span> <span class="token class-name">Reflection</span><span class="token punctuation">.</span><span class="token function">getCallerClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span>
<span class="token class-name">String</span> url<span class="token punctuation">,</span> <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span>Properties</span> info<span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> caller<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token comment">/*
* When callerCl is null, we should check the application's
* (which is invoking this class indirectly)
* classloader, so that the JDBC driver class outside rt.jar
* can be loaded from here.
*/</span>
<span class="token class-name">ClassLoader</span> callerCL <span class="token operator">=</span> caller <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">?</span> caller<span class="token punctuation">.</span><span class="token function">getClassLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span><span class="token class-name">DriverManager</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// synchronize loading of the correct classloader.</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>callerCL <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
callerCL <span class="token operator">=</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getContextClassLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span>url <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">SQLException</span><span class="token punctuation">(</span><span class="token string">"The url cannot be null"</span><span class="token punctuation">,</span> <span class="token string">"08001"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"DriverManager.getConnection(\""</span> <span class="token operator">+</span> url <span class="token operator">+</span> <span class="token string">"\")"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Walk through the loaded registeredDrivers attempting to make a connection.</span>
<span class="token comment">// Remember the first exception that gets raised so we can reraise it.</span>
<span class="token class-name">SQLException</span> reason <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token class-name">DriverInfo</span> aDriver <span class="token operator">:</span> registeredDrivers<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// If the caller does not have permission to load the driver then</span>
<span class="token comment">// skip it.</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token function">isDriverAllowed</span><span class="token punctuation">(</span>aDriver<span class="token punctuation">.</span>driver<span class="token punctuation">,</span> callerCL<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// ----------> driver[className=com.mysql.cj.jdbc.Driver@64030b91]</span>
<span class="token function">println</span><span class="token punctuation">(</span><span class="token string">" trying "</span> <span class="token operator">+</span> aDriver<span class="token punctuation">.</span>driver<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Connection</span> con <span class="token operator">=</span> aDriver<span class="token punctuation">.</span>driver<span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span> info<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>con <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Success!</span>
<span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"getConnection returning "</span> <span class="token operator">+</span> aDriver<span class="token punctuation">.</span>driver<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token punctuation">(</span>con<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">SQLException</span> ex<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>reason <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
reason <span class="token operator">=</span> ex<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token function">println</span><span class="token punctuation">(</span><span class="token string">" skipping: "</span> <span class="token operator">+</span> aDriver<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// if we got here nobody could connect.</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>reason <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"getConnection failed: "</span> <span class="token operator">+</span> reason<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> reason<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"getConnection: no suitable driver found for "</span><span class="token operator">+</span> url<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">SQLException</span><span class="token punctuation">(</span><span class="token string">"No suitable driver found for "</span><span class="token operator">+</span> url<span class="token punctuation">,</span> <span class="token string">"08001"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>上面的driver就是driver[className&#x3D;com.mysql.cj.jdbc.Driver@64030b91]</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// com.mysql.cj.jdbc.NonRegisteringDriver#connect</span>
<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">connect</span><span class="token punctuation">(</span><span class="token class-name">String</span> url<span class="token punctuation">,</span> <span class="token class-name">Properties</span> info<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token class-name">ConnectionUrl</span><span class="token punctuation">.</span><span class="token function">acceptsUrl</span><span class="token punctuation">(</span>url<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ConnectionUrl</span> conStr <span class="token operator">=</span> <span class="token class-name">ConnectionUrl</span><span class="token punctuation">.</span><span class="token function">getConnectionUrlInstance</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span> info<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>conStr<span class="token punctuation">.</span><span class="token function">getType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">case</span> <span class="token constant">SINGLE_CONNECTION</span><span class="token operator">:</span>
<span class="token keyword">return</span> <span class="token class-name">ConnectionImpl</span><span class="token punctuation">.</span><span class="token function">getInstance</span><span class="token punctuation">(</span>conStr<span class="token punctuation">.</span><span class="token function">getMainHost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token constant">FAILOVER_CONNECTION</span><span class="token operator">:</span>
<span class="token keyword">case</span> <span class="token constant">FAILOVER_DNS_SRV_CONNECTION</span><span class="token operator">:</span>
<span class="token keyword">return</span> <span class="token class-name">FailoverConnectionProxy</span><span class="token punctuation">.</span><span class="token function">createProxyInstance</span><span class="token punctuation">(</span>conStr<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token constant">LOADBALANCE_CONNECTION</span><span class="token operator">:</span>
<span class="token keyword">case</span> <span class="token constant">LOADBALANCE_DNS_SRV_CONNECTION</span><span class="token operator">:</span>
<span class="token keyword">return</span> <span class="token class-name">LoadBalancedConnectionProxy</span><span class="token punctuation">.</span><span class="token function">createProxyInstance</span><span class="token punctuation">(</span>conStr<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token constant">REPLICATION_CONNECTION</span><span class="token operator">:</span>
<span class="token keyword">case</span> <span class="token constant">REPLICATION_DNS_SRV_CONNECTION</span><span class="token operator">:</span>
<span class="token keyword">return</span> <span class="token class-name">ReplicationConnectionProxy</span><span class="token punctuation">.</span><span class="token function">createProxyInstance</span><span class="token punctuation">(</span>conStr<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">UnsupportedConnectionStringException</span> var5<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">CJException</span> var6<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token punctuation">(</span><span class="token class-name">UnableToConnectException</span><span class="token punctuation">)</span><span class="token class-name">ExceptionFactory</span><span class="token punctuation">.</span><span class="token function">createException</span><span class="token punctuation">(</span><span class="token class-name">UnableToConnectException</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> <span class="token class-name">Messages</span><span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"NonRegisteringDriver.17"</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">&#123;</span>var6<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">,</span> var6<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">CJException</span> var7<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token class-name">SQLExceptionsMapping</span><span class="token punctuation">.</span><span class="token function">translateException</span><span class="token punctuation">(</span>var7<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这是个 SINGLE_CONNECTION ,所以调用的就是 return ConnectionImpl.getInstance(conStr.getMainHost());<br>然后在这里设置了代理类</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">PooledConnection</span><span class="token punctuation">(</span><span class="token class-name">Connection</span> connection<span class="token punctuation">,</span> <span class="token class-name">PooledDataSource</span> dataSource<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>hashCode <span class="token operator">=</span> connection<span class="token punctuation">.</span><span class="token function">hashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>realConnection <span class="token operator">=</span> connection<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>dataSource <span class="token operator">=</span> dataSource<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>createdTimestamp <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>lastUsedTimestamp <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>valid <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>proxyConnection <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">Connection</span><span class="token punctuation">)</span> <span class="token class-name">Proxy</span><span class="token punctuation">.</span><span class="token function">newProxyInstance</span><span class="token punctuation">(</span><span class="token class-name">Connection</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">.</span><span class="token function">getClassLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token constant">IFACES</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>结合这个</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token function">popConnection</span><span class="token punctuation">(</span>dataSource<span class="token punctuation">.</span><span class="token function">getUsername</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> dataSource<span class="token punctuation">.</span><span class="token function">getPassword</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getProxyConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><p>所以最终的connection就是com.mysql.cj.jdbc.ConnectionImpl@358ab600</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2022/12/11/mybatis%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E6%9D%A1sql%E7%9A%84%E7%BB%86%E8%8A%82/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2022/12/11/mybatis%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E6%9D%A1sql%E7%9A%84%E7%BB%86%E8%8A%82/" class="post-title-link" itemprop="url">mybatis系列-第一条sql的细节</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2022-12-11 20:50:29" itemprop="dateCreated datePublished" datetime="2022-12-11T20:50:29+08:00">2022-12-11</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a> </span></span><span id="/2022/12/11/mybatis%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E6%9D%A1sql%E7%9A%84%E7%BB%86%E8%8A%82/" class="post-meta-item leancloud_visitors" data-flag-title="mybatis系列-第一条sql的细节" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2022/12/11/mybatis%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E6%9D%A1sql%E7%9A%84%E7%BB%86%E8%8A%82/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2022/12/11/mybatis系列-第一条sql的细节/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>先补充两个点，<br>第一是前面我们说了<br>使用<code>org.apache.ibatis.builder.xml.XMLConfigBuilder</code> 创建了<code>parser</code>解析器，那么解析的结果是什么<br>看这个方法的返回值</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">Configuration</span> <span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>parsed<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Each XMLConfigBuilder can only be used once."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
parsed <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token function">parseConfiguration</span><span class="token punctuation">(</span>parser<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"/configuration"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> configuration<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>返回的是 <code>org.apache.ibatis.session.Configuration</code> , 而这个 <code>Configuration</code> 也是 <code>mybatis</code> 中特别重要的配置核心类，贴一下里面的成员变量，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Configuration</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">protected</span> <span class="token class-name">Environment</span> environment<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> safeRowBoundsEnabled<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> safeResultHandlerEnabled <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> mapUnderscoreToCamelCase<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> aggressiveLazyLoading<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> multipleResultSetsEnabled <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> useGeneratedKeys<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> useColumnLabel <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> cacheEnabled <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> callSettersOnNulls<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> useActualParamName <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> returnInstanceForEmptyRow<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> shrinkWhitespacesInSql<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> nullableOnForEach<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> argNameBasedConstructorAutoMapping<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">String</span> logPrefix<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">Log</span><span class="token punctuation">></span></span> logImpl<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">extends</span> VFS<span class="token punctuation">></span></span> vfsImpl<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> defaultSqlProviderType<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">LocalCacheScope</span> localCacheScope <span class="token operator">=</span> <span class="token class-name">LocalCacheScope</span><span class="token punctuation">.</span><span class="token constant">SESSION</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">JdbcType</span> jdbcTypeForNull <span class="token operator">=</span> <span class="token class-name">JdbcType</span><span class="token punctuation">.</span><span class="token constant">OTHER</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">Set</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">></span></span> lazyLoadTriggerMethods <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashSet</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token class-name">Arrays</span><span class="token punctuation">.</span><span class="token function">asList</span><span class="token punctuation">(</span><span class="token string">"equals"</span><span class="token punctuation">,</span> <span class="token string">"clone"</span><span class="token punctuation">,</span> <span class="token string">"hashCode"</span><span class="token punctuation">,</span> <span class="token string">"toString"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">Integer</span> defaultStatementTimeout<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">Integer</span> defaultFetchSize<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">ResultSetType</span> defaultResultSetType<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">ExecutorType</span> defaultExecutorType <span class="token operator">=</span> <span class="token class-name">ExecutorType</span><span class="token punctuation">.</span><span class="token constant">SIMPLE</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">AutoMappingBehavior</span> autoMappingBehavior <span class="token operator">=</span> <span class="token class-name">AutoMappingBehavior</span><span class="token punctuation">.</span><span class="token constant">PARTIAL</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">AutoMappingUnknownColumnBehavior</span> autoMappingUnknownColumnBehavior <span class="token operator">=</span> <span class="token class-name">AutoMappingUnknownColumnBehavior</span><span class="token punctuation">.</span><span class="token constant">NONE</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">Properties</span> variables <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Properties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">ReflectorFactory</span> reflectorFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DefaultReflectorFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">ObjectFactory</span> objectFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DefaultObjectFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">ObjectWrapperFactory</span> objectWrapperFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DefaultObjectWrapperFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> lazyLoadingEnabled <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token class-name">ProxyFactory</span> proxyFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">JavassistProxyFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// #224 Using internal Javassist instead of OGNL</span>
<span class="token keyword">protected</span> <span class="token class-name">String</span> databaseId<span class="token punctuation">;</span>
<span class="token comment">/**
* Configuration factory class.
* Used to create Configuration for loading deserialized unread properties.
*
* @see &lt;a href='https://github.com/mybatis/old-google-code-issues/issues/300'>Issue 300 (google code)&lt;/a>
*/</span>
<span class="token keyword">protected</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> configurationFactory<span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">MapperRegistry</span> mapperRegistry <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MapperRegistry</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">InterceptorChain</span> interceptorChain <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">InterceptorChain</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">TypeHandlerRegistry</span> typeHandlerRegistry <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TypeHandlerRegistry</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">TypeAliasRegistry</span> typeAliasRegistry <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TypeAliasRegistry</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">LanguageDriverRegistry</span> languageRegistry <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LanguageDriverRegistry</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">MappedStatement</span><span class="token punctuation">></span></span> mappedStatements <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StrictMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">MappedStatement</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token string">"Mapped Statements collection"</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">conflictMessageProducer</span><span class="token punctuation">(</span><span class="token punctuation">(</span>savedValue<span class="token punctuation">,</span> targetValue<span class="token punctuation">)</span> <span class="token operator">-></span>
<span class="token string">". please check "</span> <span class="token operator">+</span> savedValue<span class="token punctuation">.</span><span class="token function">getResource</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" and "</span> <span class="token operator">+</span> targetValue<span class="token punctuation">.</span><span class="token function">getResource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Cache</span><span class="token punctuation">></span></span> caches <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StrictMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token string">"Caches collection"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">ResultMap</span><span class="token punctuation">></span></span> resultMaps <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StrictMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token string">"Result Maps collection"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">ParameterMap</span><span class="token punctuation">></span></span> parameterMaps <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StrictMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token string">"Parameter Maps collection"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">KeyGenerator</span><span class="token punctuation">></span></span> keyGenerators <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StrictMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token string">"Key Generators collection"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Set</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">></span></span> loadedResources <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashSet</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">XNode</span><span class="token punctuation">></span></span> sqlFragments <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StrictMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token string">"XML fragments parsed from previous mappers"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">XMLStatementBuilder</span><span class="token punctuation">></span></span> incompleteStatements <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">CacheRefResolver</span><span class="token punctuation">></span></span> incompleteCacheRefs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">ResultMapResolver</span><span class="token punctuation">></span></span> incompleteResultMaps <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">MethodResolver</span><span class="token punctuation">></span></span> incompleteMethods <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这么多成员变量，先不一一解释作用，但是其中的几个参数我们应该是已经知道了的，第一个就是 <code>mappedStatements</code> ，上一篇我们知道被解析的mapper就是放在这里，后面的 <code>resultMaps</code> ，<code>parameterMaps</code> 也比较常用的就是我们参数和结果的映射<code>map</code>，这里跟我之前有一篇解释为啥我们一些变量的使用会比较特殊，比如<code>list</code>，可以<a href="https://nicksxs.me/2022/07/09/mybatis-%E7%9A%84-foreach-%E4%BD%BF%E7%94%A8%E7%9A%84%E6%B3%A8%E6%84%8F%E7%82%B9/">参考这篇</a>，<code>keyGenerators</code>是在我们需要定义主键生成器的时候使用。<br>然后第二点是我们创建的 <code>org.apache.ibatis.session.SqlSessionFactory</code> 是哪个，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">SqlSessionFactory</span> <span class="token function">build</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> config<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">DefaultSqlSessionFactory</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><p>是这个 <code>DefaultSqlSessionFactory</code> ，这是其中一个 <code>SqlSessionFactory</code> 的实现<br>接下来我们看看 <code>openSession</code> 里干了啥</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">SqlSession</span> <span class="token function">openSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token function">openSessionFromDataSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">.</span><span class="token function">getDefaultExecutorType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><p>这边有几个参数，第一个是默认的执行器类型，往上找找上面贴着的 <code>Configuration</code> 的成员变量里可以看到默认是<br><code>protected ExecutorType defaultExecutorType = ExecutorType.SIMPLE;</code></p><p>因为没有指明特殊的执行逻辑，所以默认我们也就用简单类型的，第二个参数是是事务级别，第三个是是否自动提交</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token class-name">SqlSession</span> <span class="token function">openSessionFromDataSource</span><span class="token punctuation">(</span><span class="token class-name">ExecutorType</span> execType<span class="token punctuation">,</span> <span class="token class-name">TransactionIsolationLevel</span> level<span class="token punctuation">,</span> <span class="token keyword">boolean</span> autoCommit<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Transaction</span> tx <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">final</span> <span class="token class-name">Environment</span> environment <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">getEnvironment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token class-name">TransactionFactory</span> transactionFactory <span class="token operator">=</span> <span class="token function">getTransactionFactoryFromEnvironment</span><span class="token punctuation">(</span>environment<span class="token punctuation">)</span><span class="token punctuation">;</span>
tx <span class="token operator">=</span> transactionFactory<span class="token punctuation">.</span><span class="token function">newTransaction</span><span class="token punctuation">(</span>environment<span class="token punctuation">.</span><span class="token function">getDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> level<span class="token punctuation">,</span> autoCommit<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// --------> 先关注这里</span>
<span class="token keyword">final</span> <span class="token class-name">Executor</span> executor <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">newExecutor</span><span class="token punctuation">(</span>tx<span class="token punctuation">,</span> execType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">DefaultSqlSession</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> executor<span class="token punctuation">,</span> autoCommit<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">closeTransaction</span><span class="token punctuation">(</span>tx<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// may have fetched a connection so lets call close()</span>
<span class="token keyword">throw</span> <span class="token class-name">ExceptionFactory</span><span class="token punctuation">.</span><span class="token function">wrapException</span><span class="token punctuation">(</span><span class="token string">"Error opening session. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>具体是调用了 <code>Configuration</code> 的这个方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">Executor</span> <span class="token function">newExecutor</span><span class="token punctuation">(</span><span class="token class-name">Transaction</span> transaction<span class="token punctuation">,</span> <span class="token class-name">ExecutorType</span> executorType<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
executorType <span class="token operator">=</span> executorType <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> defaultExecutorType <span class="token operator">:</span> executorType<span class="token punctuation">;</span>
<span class="token class-name">Executor</span> executor<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">ExecutorType</span><span class="token punctuation">.</span><span class="token constant">BATCH</span> <span class="token operator">==</span> executorType<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
executor <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BatchExecutor</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> transaction<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">ExecutorType</span><span class="token punctuation">.</span><span class="token constant">REUSE</span> <span class="token operator">==</span> executorType<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
executor <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReuseExecutor</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> transaction<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// ---------> 会走到这个分支</span>
executor <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SimpleExecutor</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> transaction<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>cacheEnabled<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
executor <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CachingExecutor</span><span class="token punctuation">(</span>executor<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
executor <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">Executor</span><span class="token punctuation">)</span> interceptorChain<span class="token punctuation">.</span><span class="token function">pluginAll</span><span class="token punctuation">(</span>executor<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> executor<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>上面传入的 <code>executorType</code> 是 <code>Configuration</code> 的默认类型，也就是 <code>simple</code> 类型，并且 <code>cacheEnabled</code> 在 <code>Configuration</code> 默认为 <code>true</code>，所以会包装成<code>CachingExecutor</code> ,然后后面就是插件了，这块我们先不展开<br>然后我们的openSession返回的就是创建了<code>DefaultSqlSession</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">DefaultSqlSession</span><span class="token punctuation">(</span><span class="token class-name">Configuration</span> configuration<span class="token punctuation">,</span> <span class="token class-name">Executor</span> executor<span class="token punctuation">,</span> <span class="token keyword">boolean</span> autoCommit<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>configuration <span class="token operator">=</span> configuration<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>executor <span class="token operator">=</span> executor<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>dirty <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>autoCommit <span class="token operator">=</span> autoCommit<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后就是调用 <code>selectOne</code>, 因为前面已经把这部分代码说过了，就直接跳转过来<br><code>org.apache.ibatis.session.defaults.DefaultSqlSession#selectList(java.lang.String, java.lang.Object, org.apache.ibatis.session.RowBounds, org.apache.ibatis.session.ResultHandler)</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">selectList</span><span class="token punctuation">(</span><span class="token class-name">String</span> statement<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> handler<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">MappedStatement</span> ms <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">getMappedStatement</span><span class="token punctuation">(</span>statement<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> executor<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> <span class="token function">wrapCollection</span><span class="token punctuation">(</span>parameter<span class="token punctuation">)</span><span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> handler<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token class-name">ExceptionFactory</span><span class="token punctuation">.</span><span class="token function">wrapException</span><span class="token punctuation">(</span><span class="token string">"Error querying database. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>因为前面说了 <code>executor</code> 包装了 <code>CachingExecutor</code> ，所以会先调用</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameterObject<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">BoundSql</span> boundSql <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getBoundSql</span><span class="token punctuation">(</span>parameterObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">CacheKey</span> key <span class="token operator">=</span> <span class="token function">createCacheKey</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后是调用的真实的query方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameterObject<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">CacheKey</span> key<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span>
<span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Cache</span> cache <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getCache</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>cache <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">flushCacheIfRequired</span><span class="token punctuation">(</span>ms<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">isUseCache</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> resultHandler <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">ensureNoOutParams</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token annotation punctuation">@SuppressWarnings</span><span class="token punctuation">(</span><span class="token string">"unchecked"</span><span class="token punctuation">)</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> list <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> tcm<span class="token punctuation">.</span><span class="token function">getObject</span><span class="token punctuation">(</span>cache<span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>list <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
list <span class="token operator">=</span> delegate<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
tcm<span class="token punctuation">.</span><span class="token function">putObject</span><span class="token punctuation">(</span>cache<span class="token punctuation">,</span> key<span class="token punctuation">,</span> list<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// issue #578 and #116</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> list<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> delegate<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameterObject<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里是第一次查询，没有缓存就先到最后一行，继续是调用到 <code>org.apache.ibatis.executor.BaseExecutor#queryFromDatabase</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">CacheKey</span> key<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">resource</span><span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getResource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">activity</span><span class="token punctuation">(</span><span class="token string">"executing a query"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">object</span><span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>closed<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">ExecutorException</span><span class="token punctuation">(</span><span class="token string">"Executor was closed."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>queryStack <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> ms<span class="token punctuation">.</span><span class="token function">isFlushCacheRequired</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">clearLocalCache</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> list<span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
queryStack<span class="token operator">++</span><span class="token punctuation">;</span>
list <span class="token operator">=</span> resultHandler <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span><span class="token punctuation">)</span> localCache<span class="token punctuation">.</span><span class="token function">getObject</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>list <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">handleLocallyCachedOutputParameters</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> key<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// ----------->会走到这里</span>
list <span class="token operator">=</span> <span class="token function">queryFromDatabase</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> key<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
queryStack<span class="token operator">--</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>queryStack <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">DeferredLoad</span> deferredLoad <span class="token operator">:</span> deferredLoads<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
deferredLoad<span class="token punctuation">.</span><span class="token function">load</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// issue #601</span>
deferredLoads<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>configuration<span class="token punctuation">.</span><span class="token function">getLocalCacheScope</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">LocalCacheScope</span><span class="token punctuation">.</span><span class="token constant">STATEMENT</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// issue #482</span>
<span class="token function">clearLocalCache</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> list<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后是</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">queryFromDatabase</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">CacheKey</span> key<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> list<span class="token punctuation">;</span>
localCache<span class="token punctuation">.</span><span class="token function">putObject</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> <span class="token constant">EXECUTION_PLACEHOLDER</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
list <span class="token operator">=</span> <span class="token function">doQuery</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
localCache<span class="token punctuation">.</span><span class="token function">removeObject</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
localCache<span class="token punctuation">.</span><span class="token function">putObject</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> list<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getStatementType</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">StatementType</span><span class="token punctuation">.</span><span class="token constant">CALLABLE</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
localOutputParameterCache<span class="token punctuation">.</span><span class="token function">putObject</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> parameter<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> list<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后就是 <code>simpleExecutor</code> 的执行过程</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">doQuery</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">,</span> <span class="token class-name">BoundSql</span> boundSql<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Statement</span> stmt <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Configuration</span> configuration <span class="token operator">=</span> ms<span class="token punctuation">.</span><span class="token function">getConfiguration</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">StatementHandler</span> handler <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">newStatementHandler</span><span class="token punctuation">(</span>wrapper<span class="token punctuation">,</span> ms<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> resultHandler<span class="token punctuation">,</span> boundSql<span class="token punctuation">)</span><span class="token punctuation">;</span>
stmt <span class="token operator">=</span> <span class="token function">prepareStatement</span><span class="token punctuation">(</span>handler<span class="token punctuation">,</span> ms<span class="token punctuation">.</span><span class="token function">getStatementLog</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> handler<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>stmt<span class="token punctuation">,</span> resultHandler<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token function">closeStatement</span><span class="token punctuation">(</span>stmt<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>接下去其实就是跟jdbc交互了</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token class-name">Statement</span> statement<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> resultHandler<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">PreparedStatement</span> ps <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">PreparedStatement</span><span class="token punctuation">)</span> statement<span class="token punctuation">;</span>
ps<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> resultSetHandler<span class="token punctuation">.</span><span class="token function">handleResultSets</span><span class="token punctuation">(</span>ps<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p><code>com.mysql.cj.jdbc.ClientPreparedStatement#execute</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">execute</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">checkClosed</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getConnectionMutex</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">JdbcConnection</span> locallyScopedConn <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>connection<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>doPingInstead <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">checkReadOnlySafeStatement</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token class-name">SQLError</span><span class="token punctuation">.</span><span class="token function">createSQLException</span><span class="token punctuation">(</span><span class="token class-name">Messages</span><span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"PreparedStatement.20"</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token class-name">Messages</span><span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"PreparedStatement.21"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">"S1009"</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>exceptionInterceptor<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ResultSetInternalMethods</span> rs <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>lastQueryIsOnDupKeyUpdate <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>retrieveGeneratedKeys<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>lastQueryIsOnDupKeyUpdate <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">containsOnDuplicateKeyUpdate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>batchedGeneratedKeys <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">resetCancelledState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">implicitlyCloseAllOpenResults</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">clearWarnings</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>doPingInstead<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">doPingInstead</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setupStreamingTimeout</span><span class="token punctuation">(</span>locallyScopedConn<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Message</span> sendPacket <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">PreparedQuery</span><span class="token punctuation">)</span><span class="token keyword">this</span><span class="token punctuation">.</span>query<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">fillSendPacket</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">PreparedQuery</span><span class="token punctuation">)</span><span class="token keyword">this</span><span class="token punctuation">.</span>query<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getQueryBindings</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> oldDb <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>locallyScopedConn<span class="token punctuation">.</span><span class="token function">getDatabase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getCurrentDatabase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
oldDb <span class="token operator">=</span> locallyScopedConn<span class="token punctuation">.</span><span class="token function">getDatabase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
locallyScopedConn<span class="token punctuation">.</span><span class="token function">setDatabase</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getCurrentDatabase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token class-name">CachedResultSetMetaData</span> cachedMetadata <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> cacheResultSetMetadata <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">Boolean</span><span class="token punctuation">)</span>locallyScopedConn<span class="token punctuation">.</span><span class="token function">getPropertySet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getBooleanProperty</span><span class="token punctuation">(</span><span class="token class-name">PropertyKey</span><span class="token punctuation">.</span>cacheResultSetMetadata<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>cacheResultSetMetadata<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
cachedMetadata <span class="token operator">=</span> locallyScopedConn<span class="token punctuation">.</span><span class="token function">getCachedMetaData</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">PreparedQuery</span><span class="token punctuation">)</span><span class="token keyword">this</span><span class="token punctuation">.</span>query<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getOriginalSql</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
locallyScopedConn<span class="token punctuation">.</span><span class="token function">setSessionMaxRows</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getQueryInfo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirstStmtChar</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token char">'S'</span> <span class="token operator">?</span> <span class="token keyword">this</span><span class="token punctuation">.</span>maxRows <span class="token operator">:</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
rs <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">executeInternal</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>maxRows<span class="token punctuation">,</span> sendPacket<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">createStreamingResultSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getQueryInfo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirstStmtChar</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token char">'S'</span><span class="token punctuation">,</span> cachedMetadata<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>cachedMetadata <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
locallyScopedConn<span class="token punctuation">.</span><span class="token function">initializeResultsMetadataFromCache</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">PreparedQuery</span><span class="token punctuation">)</span><span class="token keyword">this</span><span class="token punctuation">.</span>query<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getOriginalSql</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> cachedMetadata<span class="token punctuation">,</span> rs<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>rs<span class="token punctuation">.</span><span class="token function">hasRows</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> cacheResultSetMetadata<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
locallyScopedConn<span class="token punctuation">.</span><span class="token function">initializeResultsMetadataFromCache</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">PreparedQuery</span><span class="token punctuation">)</span><span class="token keyword">this</span><span class="token punctuation">.</span>query<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getOriginalSql</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token class-name">CachedResultSetMetaData</span><span class="token punctuation">)</span><span class="token keyword">null</span><span class="token punctuation">,</span> rs<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>retrieveGeneratedKeys<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
rs<span class="token punctuation">.</span><span class="token function">setFirstCharOfQuery</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getQueryInfo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirstStmtChar</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>oldDb <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
locallyScopedConn<span class="token punctuation">.</span><span class="token function">setDatabase</span><span class="token punctuation">(</span>oldDb<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>rs <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>lastInsertId <span class="token operator">=</span> rs<span class="token punctuation">.</span><span class="token function">getUpdateID</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>results <span class="token operator">=</span> rs<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> rs <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> rs<span class="token punctuation">.</span><span class="token function">hasRows</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">CJException</span> var11<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token class-name">SQLExceptionsMapping</span><span class="token punctuation">.</span><span class="token function">translateException</span><span class="token punctuation">(</span>var11<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getExceptionInterceptor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></div><footer class="post-footer"><div 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href="/2022/12/04/mybatis%E6%98%AF%E5%A6%82%E4%BD%95%E5%88%9D%E5%A7%8B%E5%8C%96mapper%E7%9A%84/" class="post-title-link" itemprop="url">mybatis系列-mybatis是如何初始化mapper的</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2022-12-04 20:36:54" itemprop="dateCreated datePublished" datetime="2022-12-04T20:36:54+08:00">2022-12-04</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar-check"></i> </span><span class="post-meta-item-text">更新于</span> <time title="修改时间：2022-12-11 20:43:45" itemprop="dateModified" datetime="2022-12-11T20:43:45+08:00">2022-12-11</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a> </span></span><span id="/2022/12/04/mybatis%E6%98%AF%E5%A6%82%E4%BD%95%E5%88%9D%E5%A7%8B%E5%8C%96mapper%E7%9A%84/" class="post-meta-item leancloud_visitors" data-flag-title="mybatis系列-mybatis是如何初始化mapper的" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2022/12/04/mybatis%E6%98%AF%E5%A6%82%E4%BD%95%E5%88%9D%E5%A7%8B%E5%8C%96mapper%E7%9A%84/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2022/12/04/mybatis是如何初始化mapper的/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>前一篇讲了mybatis的初始化使用，如果我第一次看到这个使用入门文档，比较会产生疑惑的是配置了mapper，怎么就能通过<code>selectOne</code>跟语句id就能执行sql了，那么第一个问题，就是mapper是怎么被解析的，存在哪里，怎么被拿出来的</p><h2 id="添加解析mapper"><a href="#添加解析mapper" class="headerlink" title="添加解析mapper"></a>添加解析mapper</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token class-name"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>ibatis<span class="token punctuation">.</span>session<span class="token punctuation">.</span></span>SqlSessionFactoryBuilder</span>#<span class="token function">build</span><span class="token punctuation">(</span><span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span>InputStream</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token class-name">SqlSessionFactory</span> <span class="token function">build</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token function">build</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><p>通过读取mybatis-config.xml来构建SqlSessionFactory，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">SqlSessionFactory</span> <span class="token function">build</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream<span class="token punctuation">,</span> <span class="token class-name">String</span> environment<span class="token punctuation">,</span> <span class="token class-name">Properties</span> properties<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 创建下xml的解析器</span>
<span class="token class-name">XMLConfigBuilder</span> parser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLConfigBuilder</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">,</span> environment<span class="token punctuation">,</span> properties<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 进行解析，后再构建</span>
<span class="token keyword">return</span> <span class="token function">build</span><span class="token punctuation">(</span>parser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token class-name">ExceptionFactory</span><span class="token punctuation">.</span><span class="token function">wrapException</span><span class="token punctuation">(</span><span class="token string">"Error building SqlSession."</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>inputStream <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
inputStream<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Intentionally ignore. Prefer previous error.</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>创建XMLConfigBuilder</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">XMLConfigBuilder</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream<span class="token punctuation">,</span> <span class="token class-name">String</span> environment<span class="token punctuation">,</span> <span class="token class-name">Properties</span> props<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// --------> 创建 XPathParser</span>
<span class="token keyword">this</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">XPathParser</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">,</span> props<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">XMLMapperEntityResolver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> environment<span class="token punctuation">,</span> props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token class-name">XPathParser</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream<span class="token punctuation">,</span> <span class="token keyword">boolean</span> validation<span class="token punctuation">,</span> <span class="token class-name">Properties</span> variables<span class="token punctuation">,</span> <span class="token class-name">EntityResolver</span> entityResolver<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">commonConstructor</span><span class="token punctuation">(</span>validation<span class="token punctuation">,</span> variables<span class="token punctuation">,</span> entityResolver<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>document <span class="token operator">=</span> <span class="token function">createDocument</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">InputSource</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">private</span> <span class="token class-name">XMLConfigBuilder</span><span class="token punctuation">(</span><span class="token class-name">XPathParser</span> parser<span class="token punctuation">,</span> <span class="token class-name">String</span> environment<span class="token punctuation">,</span> <span class="token class-name">Properties</span> props<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">super</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Configuration</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">resource</span><span class="token punctuation">(</span><span class="token string">"SQL Mapper Configuration"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>configuration<span class="token punctuation">.</span><span class="token function">setVariables</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>parsed <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>environment <span class="token operator">=</span> environment<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>parser <span class="token operator">=</span> parser<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里主要是创建了Builder包含了Parser<br>然后调用parse方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">Configuration</span> <span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>parsed<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Each XMLConfigBuilder can only be used once."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 标记下是否已解析，但是这里是否有线程安全问题</span>
parsed <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token comment">// --------> 解析配置</span>
<span class="token function">parseConfiguration</span><span class="token punctuation">(</span>parser<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"/configuration"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> configuration<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>实际的解析区分了各类标签</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">parseConfiguration</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> root<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// issue #117 read properties first</span>
<span class="token comment">// 解析properties，这个不是spring自带的，需要额外配置，并且在config文件里应该放在最前</span>
<span class="token function">propertiesElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"properties"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Properties</span> settings <span class="token operator">=</span> <span class="token function">settingsAsProperties</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"settings"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">loadCustomVfs</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">loadCustomLogImpl</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">typeAliasesElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"typeAliases"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pluginElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"plugins"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">objectFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"objectFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">objectWrapperFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"objectWrapperFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">reflectorFactoryElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"reflectorFactory"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">settingsElement</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// read it after objectFactory and objectWrapperFactory issue #631</span>
<span class="token function">environmentsElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"environments"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">databaseIdProviderElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"databaseIdProvider"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">typeHandlerElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"typeHandlers"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// ----------> 我们需要关注的是mapper的处理</span>
<span class="token function">mapperElement</span><span class="token punctuation">(</span>root<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"mappers"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Error parsing SQL Mapper Configuration. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后就是调用到mapperElement方法了</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">mapperElement</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> parent<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>parent <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">XNode</span> child <span class="token operator">:</span> parent<span class="token punctuation">.</span><span class="token function">getChildren</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token string">"package"</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> mapperPackage <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"name"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
configuration<span class="token punctuation">.</span><span class="token function">addMappers</span><span class="token punctuation">(</span>mapperPackage<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> resource <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"resource"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> url <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"url"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> mapperClass <span class="token operator">=</span> child<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"class"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>resource <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> url <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> mapperClass <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">resource</span><span class="token punctuation">(</span>resource<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream <span class="token operator">=</span> <span class="token class-name">Resources</span><span class="token punctuation">.</span><span class="token function">getResourceAsStream</span><span class="token punctuation">(</span>resource<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">XMLMapperBuilder</span> mapperParser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLMapperBuilder</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">,</span> configuration<span class="token punctuation">,</span> resource<span class="token punctuation">,</span> configuration<span class="token punctuation">.</span><span class="token function">getSqlFragments</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// --------> 我们这没有指定package，所以是走到这</span>
mapperParser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>resource <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> url <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> mapperClass <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">resource</span><span class="token punctuation">(</span>url<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span><span class="token punctuation">(</span><span class="token class-name">InputStream</span> inputStream <span class="token operator">=</span> <span class="token class-name">Resources</span><span class="token punctuation">.</span><span class="token function">getUrlAsStream</span><span class="token punctuation">(</span>url<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
<span class="token class-name">XMLMapperBuilder</span> mapperParser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLMapperBuilder</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">,</span> configuration<span class="token punctuation">,</span> url<span class="token punctuation">,</span> configuration<span class="token punctuation">.</span><span class="token function">getSqlFragments</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
mapperParser<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>resource <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> url <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> mapperClass <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> mapperInterface <span class="token operator">=</span> <span class="token class-name">Resources</span><span class="token punctuation">.</span><span class="token function">classForName</span><span class="token punctuation">(</span>mapperClass<span class="token punctuation">)</span><span class="token punctuation">;</span>
configuration<span class="token punctuation">.</span><span class="token function">addMapper</span><span class="token punctuation">(</span>mapperInterface<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"A mapper element may only specify a url, resource or class, but not more than one."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>核心就在这个parse()方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">parse</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>configuration<span class="token punctuation">.</span><span class="token function">isResourceLoaded</span><span class="token punctuation">(</span>resource<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// -------> 然后就是走到这里,配置xml的mapper节点的内容</span>
<span class="token function">configurationElement</span><span class="token punctuation">(</span>parser<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"/mapper"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
configuration<span class="token punctuation">.</span><span class="token function">addLoadedResource</span><span class="token punctuation">(</span>resource<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">bindMapperForNamespace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">parsePendingResultMaps</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">parsePendingCacheRefs</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">parsePendingStatements</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>具体的处理逻辑</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">configurationElement</span><span class="token punctuation">(</span><span class="token class-name">XNode</span> context<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> namespace <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"namespace"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>namespace <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> namespace<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Mapper's namespace cannot be empty"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
builderAssistant<span class="token punctuation">.</span><span class="token function">setCurrentNamespace</span><span class="token punctuation">(</span>namespace<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">cacheRefElement</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"cache-ref"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">cacheElement</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">evalNode</span><span class="token punctuation">(</span><span class="token string">"cache"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">parameterMapElement</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">evalNodes</span><span class="token punctuation">(</span><span class="token string">"/mapper/parameterMap"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">resultMapElements</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">evalNodes</span><span class="token punctuation">(</span><span class="token string">"/mapper/resultMap"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sqlElement</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">evalNodes</span><span class="token punctuation">(</span><span class="token string">"/mapper/sql"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// -------> 走到这，从上下文构建statement</span>
<span class="token function">buildStatementFromContext</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">evalNodes</span><span class="token punctuation">(</span><span class="token string">"select|insert|update|delete"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">BuilderException</span><span class="token punctuation">(</span><span class="token string">"Error parsing Mapper XML. The XML location is '"</span> <span class="token operator">+</span> resource <span class="token operator">+</span> <span class="token string">"'. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>具体代码在这，从上下文构建<code>statement</code>，只不过区分了下<code>databaseId</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">buildStatementFromContext</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">XNode</span><span class="token punctuation">></span></span> list<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>configuration<span class="token punctuation">.</span><span class="token function">getDatabaseId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">buildStatementFromContext</span><span class="token punctuation">(</span>list<span class="token punctuation">,</span> configuration<span class="token punctuation">.</span><span class="token function">getDatabaseId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// -----> 判断databaseId</span>
<span class="token function">buildStatementFromContext</span><span class="token punctuation">(</span>list<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>判断下<code>databaseId</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">buildStatementFromContext</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">XNode</span><span class="token punctuation">></span></span> list<span class="token punctuation">,</span> <span class="token class-name">String</span> requiredDatabaseId<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">XNode</span> context <span class="token operator">:</span> list<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">final</span> <span class="token class-name">XMLStatementBuilder</span> statementParser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLStatementBuilder</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> builderAssistant<span class="token punctuation">,</span> context<span class="token punctuation">,</span> requiredDatabaseId<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// -------> 解析statement节点</span>
statementParser<span class="token punctuation">.</span><span class="token function">parseStatementNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IncompleteElementException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
configuration<span class="token punctuation">.</span><span class="token function">addIncompleteStatement</span><span class="token punctuation">(</span>statementParser<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>接下来就是真正处理的xml语句内容的，各个节点的信息内容</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">parseStatementNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> id <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> databaseId <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"databaseId"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">databaseIdMatchesCurrent</span><span class="token punctuation">(</span>id<span class="token punctuation">,</span> databaseId<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requiredDatabaseId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token class-name">String</span> nodeName <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getNodeName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">SqlCommandType</span> sqlCommandType <span class="token operator">=</span> <span class="token class-name">SqlCommandType</span><span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>nodeName<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token class-name">Locale</span><span class="token punctuation">.</span><span class="token constant">ENGLISH</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> isSelect <span class="token operator">=</span> sqlCommandType <span class="token operator">==</span> <span class="token class-name">SqlCommandType</span><span class="token punctuation">.</span><span class="token constant">SELECT</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> flushCache <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getBooleanAttribute</span><span class="token punctuation">(</span><span class="token string">"flushCache"</span><span class="token punctuation">,</span> <span class="token operator">!</span>isSelect<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> useCache <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getBooleanAttribute</span><span class="token punctuation">(</span><span class="token string">"useCache"</span><span class="token punctuation">,</span> isSelect<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> resultOrdered <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getBooleanAttribute</span><span class="token punctuation">(</span><span class="token string">"resultOrdered"</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Include Fragments before parsing</span>
<span class="token class-name">XMLIncludeTransformer</span> includeParser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLIncludeTransformer</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> builderAssistant<span class="token punctuation">)</span><span class="token punctuation">;</span>
includeParser<span class="token punctuation">.</span><span class="token function">applyIncludes</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">getNode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> parameterType <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"parameterType"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterTypeClass <span class="token operator">=</span> <span class="token function">resolveClass</span><span class="token punctuation">(</span>parameterType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> lang <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"lang"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">LanguageDriver</span> langDriver <span class="token operator">=</span> <span class="token function">getLanguageDriver</span><span class="token punctuation">(</span>lang<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Parse selectKey after includes and remove them.</span>
<span class="token function">processSelectKeyNodes</span><span class="token punctuation">(</span>id<span class="token punctuation">,</span> parameterTypeClass<span class="token punctuation">,</span> langDriver<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Parse the SQL (pre: &lt;selectKey> and &lt;include> were parsed and removed)</span>
<span class="token class-name">KeyGenerator</span> keyGenerator<span class="token punctuation">;</span>
<span class="token class-name">String</span> keyStatementId <span class="token operator">=</span> id <span class="token operator">+</span> <span class="token class-name">SelectKeyGenerator</span><span class="token punctuation">.</span><span class="token constant">SELECT_KEY_SUFFIX</span><span class="token punctuation">;</span>
keyStatementId <span class="token operator">=</span> builderAssistant<span class="token punctuation">.</span><span class="token function">applyCurrentNamespace</span><span class="token punctuation">(</span>keyStatementId<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>configuration<span class="token punctuation">.</span><span class="token function">hasKeyGenerator</span><span class="token punctuation">(</span>keyStatementId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
keyGenerator <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">getKeyGenerator</span><span class="token punctuation">(</span>keyStatementId<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
keyGenerator <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getBooleanAttribute</span><span class="token punctuation">(</span><span class="token string">"useGeneratedKeys"</span><span class="token punctuation">,</span>
configuration<span class="token punctuation">.</span><span class="token function">isUseGeneratedKeys</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token class-name">SqlCommandType</span><span class="token punctuation">.</span><span class="token constant">INSERT</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>sqlCommandType<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token operator">?</span> <span class="token class-name">Jdbc3KeyGenerator</span><span class="token punctuation">.</span><span class="token constant">INSTANCE</span> <span class="token operator">:</span> <span class="token class-name">NoKeyGenerator</span><span class="token punctuation">.</span><span class="token constant">INSTANCE</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 语句的主要参数解析</span>
<span class="token class-name">SqlSource</span> sqlSource <span class="token operator">=</span> langDriver<span class="token punctuation">.</span><span class="token function">createSqlSource</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> context<span class="token punctuation">,</span> parameterTypeClass<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">StatementType</span> statementType <span class="token operator">=</span> <span class="token class-name">StatementType</span><span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"statementType"</span><span class="token punctuation">,</span> <span class="token class-name">StatementType</span><span class="token punctuation">.</span><span class="token constant">PREPARED</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Integer</span> fetchSize <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getIntAttribute</span><span class="token punctuation">(</span><span class="token string">"fetchSize"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Integer</span> timeout <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getIntAttribute</span><span class="token punctuation">(</span><span class="token string">"timeout"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> parameterMap <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"parameterMap"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> resultType <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"resultType"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> resultTypeClass <span class="token operator">=</span> <span class="token function">resolveClass</span><span class="token punctuation">(</span>resultType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> resultMap <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"resultMap"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> resultSetType <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"resultSetType"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">ResultSetType</span> resultSetTypeEnum <span class="token operator">=</span> <span class="token function">resolveResultSetType</span><span class="token punctuation">(</span>resultSetType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>resultSetTypeEnum <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
resultSetTypeEnum <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">getDefaultResultSetType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token class-name">String</span> keyProperty <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"keyProperty"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> keyColumn <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"keyColumn"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> resultSets <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">getStringAttribute</span><span class="token punctuation">(</span><span class="token string">"resultSets"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// --------> 添加映射的statement</span>
builderAssistant<span class="token punctuation">.</span><span class="token function">addMappedStatement</span><span class="token punctuation">(</span>id<span class="token punctuation">,</span> sqlSource<span class="token punctuation">,</span> statementType<span class="token punctuation">,</span> sqlCommandType<span class="token punctuation">,</span>
fetchSize<span class="token punctuation">,</span> timeout<span class="token punctuation">,</span> parameterMap<span class="token punctuation">,</span> parameterTypeClass<span class="token punctuation">,</span> resultMap<span class="token punctuation">,</span> resultTypeClass<span class="token punctuation">,</span>
resultSetTypeEnum<span class="token punctuation">,</span> flushCache<span class="token punctuation">,</span> useCache<span class="token punctuation">,</span> resultOrdered<span class="token punctuation">,</span>
keyGenerator<span class="token punctuation">,</span> keyProperty<span class="token punctuation">,</span> keyColumn<span class="token punctuation">,</span> databaseId<span class="token punctuation">,</span> langDriver<span class="token punctuation">,</span> resultSets<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>添加的逻辑具体可以看下</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">MappedStatement</span> <span class="token function">addMappedStatement</span><span class="token punctuation">(</span>
<span class="token class-name">String</span> id<span class="token punctuation">,</span>
<span class="token class-name">SqlSource</span> sqlSource<span class="token punctuation">,</span>
<span class="token class-name">StatementType</span> statementType<span class="token punctuation">,</span>
<span class="token class-name">SqlCommandType</span> sqlCommandType<span class="token punctuation">,</span>
<span class="token class-name">Integer</span> fetchSize<span class="token punctuation">,</span>
<span class="token class-name">Integer</span> timeout<span class="token punctuation">,</span>
<span class="token class-name">String</span> parameterMap<span class="token punctuation">,</span>
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">,</span>
<span class="token class-name">String</span> resultMap<span class="token punctuation">,</span>
<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">></span></span> resultType<span class="token punctuation">,</span>
<span class="token class-name">ResultSetType</span> resultSetType<span class="token punctuation">,</span>
<span class="token keyword">boolean</span> flushCache<span class="token punctuation">,</span>
<span class="token keyword">boolean</span> useCache<span class="token punctuation">,</span>
<span class="token keyword">boolean</span> resultOrdered<span class="token punctuation">,</span>
<span class="token class-name">KeyGenerator</span> keyGenerator<span class="token punctuation">,</span>
<span class="token class-name">String</span> keyProperty<span class="token punctuation">,</span>
<span class="token class-name">String</span> keyColumn<span class="token punctuation">,</span>
<span class="token class-name">String</span> databaseId<span class="token punctuation">,</span>
<span class="token class-name">LanguageDriver</span> lang<span class="token punctuation">,</span>
<span class="token class-name">String</span> resultSets<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>unresolvedCacheRef<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IncompleteElementException</span><span class="token punctuation">(</span><span class="token string">"Cache-ref not yet resolved"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
id <span class="token operator">=</span> <span class="token function">applyCurrentNamespace</span><span class="token punctuation">(</span>id<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> isSelect <span class="token operator">=</span> sqlCommandType <span class="token operator">==</span> <span class="token class-name">SqlCommandType</span><span class="token punctuation">.</span><span class="token constant">SELECT</span><span class="token punctuation">;</span>
<span class="token class-name">MappedStatement<span class="token punctuation">.</span>Builder</span> statementBuilder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MappedStatement<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span>configuration<span class="token punctuation">,</span> id<span class="token punctuation">,</span> sqlSource<span class="token punctuation">,</span> sqlCommandType<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">resource</span><span class="token punctuation">(</span>resource<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">fetchSize</span><span class="token punctuation">(</span>fetchSize<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">timeout</span><span class="token punctuation">(</span>timeout<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">statementType</span><span class="token punctuation">(</span>statementType<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">keyGenerator</span><span class="token punctuation">(</span>keyGenerator<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">keyProperty</span><span class="token punctuation">(</span>keyProperty<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">keyColumn</span><span class="token punctuation">(</span>keyColumn<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">databaseId</span><span class="token punctuation">(</span>databaseId<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">lang</span><span class="token punctuation">(</span>lang<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">resultOrdered</span><span class="token punctuation">(</span>resultOrdered<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">resultSets</span><span class="token punctuation">(</span>resultSets<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">resultMaps</span><span class="token punctuation">(</span><span class="token function">getStatementResultMaps</span><span class="token punctuation">(</span>resultMap<span class="token punctuation">,</span> resultType<span class="token punctuation">,</span> id<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">resultSetType</span><span class="token punctuation">(</span>resultSetType<span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">flushCacheRequired</span><span class="token punctuation">(</span><span class="token function">valueOrDefault</span><span class="token punctuation">(</span>flushCache<span class="token punctuation">,</span> <span class="token operator">!</span>isSelect<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">useCache</span><span class="token punctuation">(</span><span class="token function">valueOrDefault</span><span class="token punctuation">(</span>useCache<span class="token punctuation">,</span> isSelect<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">cache</span><span class="token punctuation">(</span>currentCache<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">ParameterMap</span> statementParameterMap <span class="token operator">=</span> <span class="token function">getStatementParameterMap</span><span class="token punctuation">(</span>parameterMap<span class="token punctuation">,</span> parameterType<span class="token punctuation">,</span> id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>statementParameterMap <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
statementBuilder<span class="token punctuation">.</span><span class="token function">parameterMap</span><span class="token punctuation">(</span>statementParameterMap<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token class-name">MappedStatement</span> statement <span class="token operator">=</span> statementBuilder<span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// ------> 正好是这里在configuration中添加了映射好的statement</span>
configuration<span class="token punctuation">.</span><span class="token function">addMappedStatement</span><span class="token punctuation">(</span>statement<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> statement<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而里面就是往map里添加</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addMappedStatement</span><span class="token punctuation">(</span><span class="token class-name">MappedStatement</span> ms<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
mappedStatements<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>ms<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> ms<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><h2 id="获取mapper"><a href="#获取mapper" class="headerlink" title="获取mapper"></a>获取mapper</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token class-name">StudentDO</span> studentDO <span class="token operator">=</span> session<span class="token punctuation">.</span><span class="token function">selectOne</span><span class="token punctuation">(</span><span class="token string">"com.nicksxs.mybatisdemo.StudentMapper.selectStudent"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p>就是调用了 <code>org.apache.ibatis.session.defaults.DefaultSqlSession#selectOne(java.lang.String, java.lang.Object)</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token class-name">T</span> <span class="token function">selectOne</span><span class="token punctuation">(</span><span class="token class-name">String</span> statement<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Popular vote was to return null on 0 results and throw exception on too many.</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">></span></span> list <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">selectList</span><span class="token punctuation">(</span>statement<span class="token punctuation">,</span> parameter<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>list<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> list<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>list<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TooManyResultsException</span><span class="token punctuation">(</span><span class="token string">"Expected one result (or null) to be returned by selectOne(), but found: "</span> <span class="token operator">+</span> list<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>调用实际的实现方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">selectList</span><span class="token punctuation">(</span><span class="token class-name">String</span> statement<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">selectList</span><span class="token punctuation">(</span>statement<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span><span class="token punctuation">.</span><span class="token constant">DEFAULT</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><p>这里还有一层</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">selectList</span><span class="token punctuation">(</span><span class="token class-name">String</span> statement<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token function">selectList</span><span class="token punctuation">(</span>statement<span class="token punctuation">,</span> parameter<span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">Executor</span><span class="token punctuation">.</span><span class="token constant">NO_RESULT_HANDLER</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><p>根本的就是从configuration里获取了mappedStatement</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">E</span><span class="token punctuation">></span></span> <span class="token function">selectList</span><span class="token punctuation">(</span><span class="token class-name">String</span> statement<span class="token punctuation">,</span> <span class="token class-name">Object</span> parameter<span class="token punctuation">,</span> <span class="token class-name">RowBounds</span> rowBounds<span class="token punctuation">,</span> <span class="token class-name">ResultHandler</span> handler<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 这里进行了获取</span>
<span class="token class-name">MappedStatement</span> ms <span class="token operator">=</span> configuration<span class="token punctuation">.</span><span class="token function">getMappedStatement</span><span class="token punctuation">(</span>statement<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> executor<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>ms<span class="token punctuation">,</span> <span class="token function">wrapCollection</span><span class="token punctuation">(</span>parameter<span class="token punctuation">)</span><span class="token punctuation">,</span> rowBounds<span class="token punctuation">,</span> handler<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token class-name">ExceptionFactory</span><span class="token punctuation">.</span><span class="token function">wrapException</span><span class="token punctuation">(</span><span class="token string">"Error querying database. Cause: "</span> <span class="token operator">+</span> e<span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">ErrorContext</span><span class="token punctuation">.</span><span class="token function">instance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2022/11/27/mybatis%E7%B3%BB%E5%88%97-%E5%85%A5%E9%97%A8%E7%AF%87/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2022/11/27/mybatis%E7%B3%BB%E5%88%97-%E5%85%A5%E9%97%A8%E7%AF%87/" class="post-title-link" itemprop="url">mybatis系列-入门篇</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2022-11-27 19:47:52" itemprop="dateCreated datePublished" datetime="2022-11-27T19:47:52+08:00">2022-11-27</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/Mybatis/" itemprop="url" rel="index"><span itemprop="name">Mybatis</span></a> </span></span><span id="/2022/11/27/mybatis%E7%B3%BB%E5%88%97-%E5%85%A5%E9%97%A8%E7%AF%87/" class="post-meta-item leancloud_visitors" data-flag-title="mybatis系列-入门篇" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2022/11/27/mybatis%E7%B3%BB%E5%88%97-%E5%85%A5%E9%97%A8%E7%AF%87/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2022/11/27/mybatis系列-入门篇/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>mybatis是我们比较常用的orm框架，下面是官网的介绍</p><blockquote><p>MyBatis 是一款优秀的持久层框架，它支持自定义 SQL、存储过程以及高级映射。MyBatis 免除了几乎所有的 JDBC 代码以及设置参数和获取结果集的工作。MyBatis 可以通过简单的 XML 或注解来配置和映射原始类型、接口和 Java POJO（Plain Old Java Objects，普通老式 Java 对象）为数据库中的记录。</p></blockquote><p>mybatis一大特点，或者说比较为人熟知的应该就是比 hibernate 是更轻量化，为国人所爱好的orm框架，对于hibernate目前还没有深入的拆解过，后续可以也写一下，在使用体验上觉得是个比较精巧的框架，看代码也比较容易，所以就想写个系列，第一篇先是介绍下使用<br>根据官网的文档上我们先来尝试一下简单使用<br>首先我们有个简单的配置，这个文件是<code>mybatis-config.xml</code></p><pre class="line-numbers language-markup" data-language="markup"><code class="language-markup"><span class="token prolog">&lt;?xml version="1.0" encoding="UTF-8" ?></span>
<span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">configuration</span>
<span class="token name">PUBLIC</span> <span class="token string">"-//mybatis.org//DTD Config 3.0//EN"</span>
<span class="token string">"https://mybatis.org/dtd/mybatis-3-config.dtd"</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>configuration</span><span class="token punctuation">></span></span>
<span class="token comment">&lt;!-- 需要加入的properties--></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>properties</span> <span class="token attr-name">resource</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>application-development.properties<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
<span class="token comment">&lt;!-- 指出使用哪个环境，默认是development--></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>environments</span> <span class="token attr-name">default</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>development<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>environment</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>development<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token comment">&lt;!-- 指定事务管理器类型--></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>transactionManager</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>JDBC<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
<span class="token comment">&lt;!-- 指定数据源类型--></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dataSource</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>POOLED<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token comment">&lt;!-- 下面就是具体的参数占位了--></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>driver<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;driver&#125;<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>url<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;url&#125;<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;username&#125;<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;password&#125;<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dataSource</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>environment</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>environments</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>mappers</span><span class="token punctuation">></span></span>
<span class="token comment">&lt;!-- 指定mapper xml的位置或文件--></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>mapper</span> <span class="token attr-name">resource</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>mapper/StudentMapper.xml<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>mappers</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>configuration</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>在代码里创建mybatis里重要入口</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token class-name">String</span> resource <span class="token operator">=</span> <span class="token string">"mybatis-config.xml"</span><span class="token punctuation">;</span>
<span class="token class-name">InputStream</span> inputStream <span class="token operator">=</span> <span class="token class-name">Resources</span><span class="token punctuation">.</span><span class="token function">getResourceAsStream</span><span class="token punctuation">(</span>resource<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">SqlSessionFactory</span> sqlSessionFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SqlSessionFactoryBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><p>然后我们上面的StudentMapper.xml</p><pre class="line-numbers language-markup" data-language="markup"><code class="language-markup"><span class="token prolog">&lt;?xml version="1.0" encoding="UTF-8" ?></span>
<span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">mapper</span>
<span class="token name">PUBLIC</span> <span class="token string">"-//mybatis.org//DTD Mapper 3.0//EN"</span>
<span class="token string">"https://mybatis.org/dtd/mybatis-3-mapper.dtd"</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>mapper</span> <span class="token attr-name">namespace</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>com.nicksxs.mybatisdemo.StudentMapper<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>select</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>selectStudent<span class="token punctuation">"</span></span> <span class="token attr-name">resultType</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>com.nicksxs.mybatisdemo.StudentDO<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
select * from student where id = #&#123;id&#125;
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>select</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>mapper</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>那么我们就要使用这个mapper，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token class-name">String</span> resource <span class="token operator">=</span> <span class="token string">"mybatis-config.xml"</span><span class="token punctuation">;</span>
<span class="token class-name">InputStream</span> inputStream <span class="token operator">=</span> <span class="token class-name">Resources</span><span class="token punctuation">.</span><span class="token function">getResourceAsStream</span><span class="token punctuation">(</span>resource<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">SqlSessionFactory</span> sqlSessionFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SqlSessionFactoryBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span>inputStream<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">(</span><span class="token class-name">SqlSession</span> session <span class="token operator">=</span> sqlSessionFactory<span class="token punctuation">.</span><span class="token function">openSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">StudentDO</span> studentDO <span class="token operator">=</span> session<span class="token punctuation">.</span><span class="token function">selectOne</span><span class="token punctuation">(</span><span class="token string">"com.nicksxs.mybatisdemo.StudentMapper.selectStudent"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"id is "</span> <span class="token operator">+</span> studentDO<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" name is "</span> <span class="token operator">+</span>studentDO<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>sqlSessionFactory是sqlSession的工厂，我们可以通过sqlSessionFactory来创建sqlSession，而SqlSession 提供了在数据库执行 SQL 命令所需的所有方法。你可以通过 SqlSession 实例来直接执行已映射的 SQL 语句。可以看到mapper.xml中有定义mapper的namespace，就可以通过session.selectOne()传入namespace+id来调用这个方法<br>但是这样调用比较不合理的点，或者说按后面mybatis优化之后我们可以指定mapper接口</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">StudentMapper</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">public</span> <span class="token class-name">StudentDO</span> <span class="token function">selectStudent</span><span class="token punctuation">(</span><span class="token class-name">Long</span> id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><p>就可以可以通过mapper接口获取方法，这样就不用涉及到未知的变量转换等异常</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">try</span> <span class="token punctuation">(</span><span class="token class-name">SqlSession</span> session <span class="token operator">=</span> sqlSessionFactory<span class="token punctuation">.</span><span class="token function">openSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">StudentMapper</span> mapper <span class="token operator">=</span> session<span class="token punctuation">.</span><span class="token function">getMapper</span><span class="token punctuation">(</span><span class="token class-name">StudentMapper</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">StudentDO</span> studentDO <span class="token operator">=</span> mapper<span class="token punctuation">.</span><span class="token function">selectStudent</span><span class="token punctuation">(</span><span class="token number">1L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"id is "</span> <span class="token operator">+</span> studentDO<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" name is "</span> <span class="token operator">+</span>studentDO<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这一篇咱们先介绍下简单的使用，后面可以先介绍下这些的原理。</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2022/11/20/powershell-%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BA%8C/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2022/11/20/powershell-%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BA%8C/" class="post-title-link" itemprop="url">powershell 初体验二</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2022-11-20 21:15:44 / 修改时间：21:16:13" itemprop="dateCreated datePublished" datetime="2022-11-20T21:15:44+08:00">2022-11-20</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E8%AF%AD%E8%A8%80/" itemprop="url" rel="index"><span itemprop="name">语言</span></a> </span></span><span id="/2022/11/20/powershell-%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BA%8C/" class="post-meta-item leancloud_visitors" data-flag-title="powershell 初体验二" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2022/11/20/powershell-%E5%88%9D%E4%BD%93%E9%AA%8C%E4%BA%8C/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2022/11/20/powershell-初体验二/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>powershell创建数组也很方便<br>可以这样</p><pre class="line-numbers language-powershell" data-language="powershell"><code class="language-powershell"><span class="token variable">$nums</span>=2<span class="token punctuation">,</span>0<span class="token punctuation">,</span>1<span class="token punctuation">,</span>2<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p>顺便可以用下我们上次学到的<code>gettype()</code><br><img data-src="https://img.nicksxs.com/blog/ntNjZZ.png"></p><p>如果是想创建连续数字的数组还可以用这个方便的方法</p><pre class="line-numbers language-powershell" data-language="powershell"><code class="language-powershell"><span class="token variable">$nums</span>=1<span class="token punctuation">.</span><span class="token punctuation">.</span>5<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p><img data-src="https://img.nicksxs.com/blog/0Em1Mb.png"><br>而且数组还可以存放各种类型的数据</p><pre class="line-numbers language-powershell" data-language="powershell"><code class="language-powershell"><span class="token variable">$array</span>=1<span class="token punctuation">,</span><span class="token string">"哈哈"</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token namespace">[System.Guid]</span>::NewGuid<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token punctuation">(</span><span class="token function">get-date</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p><img data-src="https://img.nicksxs.com/blog/ixU6Hp.png"><br>还有判断类型可以用<code>-is</code><br><img data-src="https://img.nicksxs.com/blog/eeWIP9.png"><br>创建一个空数组</p><pre class="line-numbers language-powershell" data-language="powershell"><code class="language-powershell"><span class="token variable">$array</span>=@<span class="token punctuation">(</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p><img data-src="https://img.nicksxs.com/blog/Bp9UAF.png"><br>数组添加元素</p><pre class="line-numbers language-powershell" data-language="powershell"><code class="language-powershell"><span class="token variable">$array</span><span class="token operator">+=</span><span class="token string">"a"</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p><img data-src="https://img.nicksxs.com/blog/iaXGt5.png"><br>数组删除元素</p><pre class="line-numbers language-powershell" data-language="powershell"><code class="language-powershell"><span class="token variable">$a</span>=1<span class="token punctuation">.</span><span class="token punctuation">.</span>4
<span class="token variable">$a</span>=<span class="token variable">$a</span><span class="token punctuation">[</span>0<span class="token punctuation">.</span><span class="token punctuation">.</span>1<span class="token punctuation">]</span><span class="token operator">+</span><span class="token variable">$a</span><span class="token punctuation">[</span>3<span class="token punctuation">]</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre><p><img data-src="https://img.nicksxs.com/blog/oUKE8A.png"></p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><nav class="pagination"><span class="page-number current">1</span><a class="page-number" href="/page/2/">2</a><span class="space">&hellip;</span><a class="page-number" href="/page/38/">38</a><a class="extend next" rel="next" href="/page/2/"><i class="fa fa-angle-right" aria-label="下一页"></i></a></nav></div></main><footer class="footer"><div class="footer-inner"><div class="beian"><a href="https://beian.miit.gov.cn/" rel="noopener" target="_blank">浙ICP备16002580号-2 </a><img src="/uploads/beian.png" alt=""><a href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=33010602011094" rel="noopener" target="_blank">浙公网安备 33010602011094号</a></div><div class="copyright">&copy; <span itemprop="copyrightYear">2022</span> <span class="with-love"><i class="fa fa-heart"></i> </span><span class="author" itemprop="copyrightHolder">Nicksxs</span></div><div class="busuanzi-count"><span class="post-meta-item" id="busuanzi_container_site_uv"><span class="post-meta-item-icon"><i class="fa fa-user"></i> </span><span class="site-uv" title="总访客量"><span id="busuanzi_value_site_uv"></span> </span></span><span class="post-meta-item" id="busuanzi_container_site_pv"><span class="post-meta-item-icon"><i class="fa fa-eye"></i> </span><span class="site-pv" title="总访问量"><span id="busuanzi_value_site_pv"></span></span></span></div></div></footer><script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/3.2.1/anime.min.js" integrity="sha256-XL2inqUJaslATFnHdJOi9GfQ60on8Wx1C2H8DYiN1xY=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.5.7/jquery.fancybox.min.js" integrity="sha256-yt2kYMy0w8AbtF89WXb2P1rfjcP/HTHLT7097U8Y5b8=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/lozad.js/1.16.0/lozad.min.js" integrity="sha256-mOFREFhqmHeQbXpK2lp4nA3qooVgACfh88fpJftLBbc=" crossorigin="anonymous"></script><script src="/js/comments.js"></script><script src="/js/utils.js"></script><script src="/js/next-boot.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/hexo-generator-searchdb/1.4.0/search.js" integrity="sha256-vXZMYLEqsROAXkEw93GGIvaB2ab+QW6w3+1ahD9nXXA=" crossorigin="anonymous"></script><script src="/js/third-party/search/local-search.js"></script><script src="/js/third-party/fancybox.js"></script><script async src="https://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script><script class="next-config" data-name="leancloud_visitors" type="application/json">{"enable":true,"app_id":"ysza182Vghlqjdt7QiwGLLJy-gzGzoHsz","app_key":"s9GDqbn7gnGGkusf66YRVccw","server_url":"https://leancloud.cn","security":true}</script><script src="/js/third-party/statistics/lean-analytics.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/quicklink/2.2.0/quicklink.umd.js" integrity="sha256-4kQf9z5ntdQrzsBC3YSHnEz02Z9C1UeW/E9OgnvlzSY=" crossorigin="anonymous"></script><script class="next-config" data-name="quicklink" type="application/json">{"enable":false,"home":false,"archive":false,"delay":true,"timeout":3000,"priority":true,"url":"https://nicksxs.me/"}</script><script src="/js/third-party/quicklink.js"></script><script class="next-config" data-name="disqus" type="application/json">{"enable":true,"shortname":"nicksxs","count":true,"i18n":{"disqus":"disqus"}}</script><script src="/js/third-party/comments/disqus.js"></script></body></html>