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872 lines
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361 KiB
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class=tag-list-link href=/tags/Spring/ rel=tag>Spring</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/Spring-Event/ rel=tag>Spring Event</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/SpringBoot/ rel=tag>SpringBoot</a><span class=tag-list-count>15</span><li class=tag-list-item><a class=tag-list-link href=/tags/Sql%E6%B3%A8%E5%85%A5/ rel=tag>Sql注入</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/Synchronized/ rel=tag>Synchronized</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Thread-dump/ rel=tag>Thread dump</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadLocal/ rel=tag>ThreadLocal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadPool/ rel=tag>ThreadPool</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Tomcat/ rel=tag>Tomcat</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/Trapping-Rain-Water/ rel=tag>Trapping Rain Water</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/WeakReference/ rel=tag>WeakReference</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Web/ rel=tag>Web</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Webhook/ rel=tag>Webhook</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Windows/ rel=tag>Windows</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/WordPress/ rel=tag>WordPress</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/aqs/ rel=tag>aqs</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/await/ rel=tag>await</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/bloom-filter/ rel=tag>bloom filter</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/c/ rel=tag>c++</a><span class=tag-list-count>14</span><li class=tag-list-item><a class=tag-list-link href=/tags/cglib/ rel=tag>cglib</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/cgroup/ rel=tag>cgroup</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/cluster/ rel=tag>cluster</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/condition/ rel=tag>condition</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dnsmasq/ rel=tag>dnsmasq</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/dp/ rel=tag>dp</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/echo/ rel=tag>echo</a><span class=tag-list-count>1</span><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 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 class=tag-list-item><a class=tag-list-link href=/tags/gc/ rel=tag>gc</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/grep/ rel=tag>grep</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/headscale/ rel=tag>headscale</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/hexo/ rel=tag>hexo</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/im/ rel=tag>im</a><span class=tag-list-count>1</span><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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/java/ rel=tag>java</a><span class=tag-list-count>36</span><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 class=tag-list-item><a class=tag-list-link href=/tags/leetcode/ rel=tag>leetcode</a><span class=tag-list-count>40</span><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 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 class=tag-list-item><a class=tag-list-link href=/tags/linux/ rel=tag>linux</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/mfc/ rel=tag>mfc</a><span class=tag-list-count>2</span><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 class=tag-list-item><a class=tag-list-link href=/tags/mq/ rel=tag>mq</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/mysql/ rel=tag>mysql</a><span class=tag-list-count>6</span><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 class=tag-list-item><a class=tag-list-link href=/tags/nas/ rel=tag>nas</a><span class=tag-list-count>6</span><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 class=tag-list-item><a class=tag-list-link href=/tags/nginx/ rel=tag>nginx</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/openresty/ rel=tag>openresty</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/powershell/ rel=tag>powershell</a><span class=tag-list-count>2</span><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 class=tag-list-item><a class=tag-list-link href=/tags/python/ rel=tag>python</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/redis/ rel=tag>redis</a><span class=tag-list-count>12</span><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 class=tag-list-item><a class=tag-list-link href=/tags/signal/ rel=tag>signal</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/spark/ rel=tag>spark</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ssh/ rel=tag>ssh</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/stream/ rel=tag>stream</a><span class=tag-list-count>2</span><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 class=tag-list-item><a class=tag-list-link href=/tags/swoole/ rel=tag>swoole</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/uname/ rel=tag>uname</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/utf8/ rel=tag>utf8</a><span class=tag-list-count>1</span><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 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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/value/ rel=tag>value</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/windows/ rel=tag>windows</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/wsl/ rel=tag>wsl</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/zsh/ rel=tag>zsh</a><span class=tag-list-count>1</span><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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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>7</span><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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 class=tag-list-item><a class=tag-list-link 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href=/tags/%E6%8D%A2%E8%BD%A6%E7%89%8C/ rel=tag>换车牌</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8E%92%E5%BA%8F/ rel=tag>排序</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8E%A5%E9%9B%A8%E6%B0%B4/ rel=tag>接雨水</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%95%B0%E6%8D%AE%E6%BA%90%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2/ rel=tag>数据源动态切换</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/ rel=tag>数据结构</a><span class=tag-list-count>11</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%96%B0%E8%AF%AD%E8%A8%80/ rel=tag>新语言</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%97%85%E6%B8%B8/ rel=tag>旅游</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link 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class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%9F%E6%B4%BB/ rel=tag>生活</a><span class=tag-list-count>42</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%B5%E7%93%B6%E8%BD%A6/ rel=tag>电瓶车</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%96%AB%E6%83%85/ rel=tag>疫情</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E4%B9%A6/ rel=tag>看书</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E5%89%A7/ rel=tag>看剧</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9F%A9%E9%98%B5/ rel=tag>矩阵</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%AB%AF%E5%8F%A3%E8%BD%AC%E5%8F%91/ rel=tag>端口转发</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B1%BB%E5%8A%A0%E8%BD%BD/ rel=tag>类加载</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B3%9F%E5%BF%83%E4%BA%8B/ rel=tag>糟心事</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B4%A2%E5%BC%95/ rel=tag>索引</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BA%BF%E7%A8%8B%E6%B1%A0/ rel=tag>线程池</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98/ rel=tag>缓存</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E5%87%BB%E7%A9%BF/ rel=tag>缓存击穿</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E7%A9%BF%E9%80%8F/ rel=tag>缓存穿透</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link 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title=https://covermusic.cn>69伙伴</a></ul></div></div></aside></div><div class="main-inner index posts-expand"><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ itemprop=url>2022 年终总结</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 itemprop="dateCreated datePublished" title="创建时间：2023-01-15 13:45:17 / 修改时间：13:45:18" datetime=2023-01-15T13:45:17+08:00>2023-01-15</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/%E7%94%9F%E6%B4%BB/ itemprop=url rel=index><span itemprop=name>生活</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ itemprop=url rel=index><span itemprop=name>年终总结</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="2022 年终总结" id=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ 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 href=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/01/15/2022-年终总结/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>一年又一年，时间匆匆，这一年过得不太容易，很多事情都是来得猝不及防，很多规划也照例是没有完成，今年更多了一些，又是比较丧的一篇总结<div class=post-button><a class=btn href=/2023/01/15/2022-%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/#more rel=contents>阅读全文 »</a></div></div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/ itemprop=url>mybatis系列-dataSource解析</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 itemprop="dateCreated datePublished" title="创建时间：2023-01-08 20:35:14" datetime=2023-01-08T20:35:14+08:00>2023-01-08</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 class="post-meta-item leancloud_visitors" data-flag-title=mybatis系列-dataSource解析 id=/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/ 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 href=/2023/01/08/mybatis%E7%B3%BB%E5%88%97-dataSource%E8%A7%A3%E6%9E%90/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/01/08/mybatis系列-dataSource解析/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>DataSource 作为数据库查询的最重要的数据源，在 mybatis 中也展开来说下<br>首先是解析的过程<pre class="line-numbers language-java" data-language=java><code class=language-java><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></code></pre><p>在构建 SqlSessionFactory 也就是 DefaultSqlSessionFactory 的时候，<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 punctuation">{</span>
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<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>
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<span class="token punctuation">}</span>
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<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">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<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>
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<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>
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<span class="token punctuation">}</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">{</span>
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<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>
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<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
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<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>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</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">{</span>
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<span class="token comment">// Intentionally ignore. Prefer previous error.</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<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></code></pre><p>前面也说过，就是解析 <code>mybatis-config.xml</code> 成 <code>Configuration</code><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">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>parsed<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<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>
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<span class="token punctuation">}</span>
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parsed <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<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>
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<span class="token keyword">return</span> configuration<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token comment">// issue #117 read properties first</span>
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<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>
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<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>
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<span class="token function">loadCustomVfs</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">loadCustomLogImpl</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<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>
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<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>
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<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>
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<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>
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<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>
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<span class="token function">settingsElement</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// read it after objectFactory and objectWrapperFactory issue #631</span>
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<span class="token comment">// -------------> 是在这里解析了DataSource</span>
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<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>
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<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>
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<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>
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<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>
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<span class="token punctuation">}</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">{</span>
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<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>
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<span class="token punctuation">}</span>
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<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></code></pre><p>环境解析了这一块的内容<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"><</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>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</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>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</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>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</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>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</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>${driver}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>url<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${url}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</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>${username}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${password}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dataSource</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>environment</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>environments</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></code></pre><p>解析也是自上而下的，<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">{</span>
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<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">{</span>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<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">{</span>
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<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>
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<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">{</span>
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<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>
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<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>
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<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>
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<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>
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<span class="token punctuation">.</span><span class="token function">transactionFactory</span><span class="token punctuation">(</span>txFactory<span class="token punctuation">)</span>
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<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>
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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>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<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></code></pre><p>前面第一步是解析事务管理器元素<pre class="line-numbers language-java" data-language=java><code class=language-java><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">{</span>
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<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">{</span>
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<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>
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<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>
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<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>
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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>
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<span class="token keyword">return</span> factory<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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>
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<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></code></pre><p>而这里的 <code>resolveClass</code> 其实就使用了上一篇的 <code>typeAliases</code> 系统，这里是使用了 <code>JdbcTransactionFactory</code> 作为事务管理器，<br>后面的就是 <code>DataSourceFactory</code> 的创建也是 <code>DataSource</code> 的创建<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token class-name">DataSourceFactory</span> <span class="token function">dataSourceElement</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">{</span>
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<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">{</span>
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<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>
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<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>
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<span class="token class-name">DataSourceFactory</span> factory <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">DataSourceFactory</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>
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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>
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<span class="token keyword">return</span> factory<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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 DataSourceFactory."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<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></code></pre><p>因为在config文件中设置了Pooled，所以对应创建的就是 <code>PooledDataSourceFactory</code><br>但是这里其实有个比较需要注意的，mybatis 这里的其实是继承了 <code>UnpooledDataSourceFactory</code><br>将基础方法都放在了 <code>UnpooledDataSourceFactory</code> 中<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">PooledDataSourceFactory</span> <span class="token keyword">extends</span> <span class="token class-name">UnpooledDataSourceFactory</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token class-name">PooledDataSourceFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>dataSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PooledDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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></code></pre><p>这里只保留了在构造方法里创建 <code>DataSource</code><br>而这个 <code>PooledDataSource</code> 虽然没有直接继承 <code>UnpooledDataSource</code>，但其实<br>在构造方法里也是<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">PooledDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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dataSource <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">UnpooledDataSource</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span></span></code></pre><p>至于为什么这么做呢应该也是考虑到能比较多的复用代码，因为 <code>Pooled</code> 其实跟 <code>Unpooled</code> 最重要的差别就在于是不是每次都重开连接<br>使用连接池能够让应用在有大量查询的时候不用反复创建连接，省去了建联的网络等开销，<code>Unpooled</code>就是完成与数据库的连接，并可以获取该连接<br>主要的代码<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<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">{</span>
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<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>
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<span class="token punctuation">}</span>
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<span class="token annotation punctuation">@Override</span>
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<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 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">{</span>
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<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>
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<span class="token punctuation">}</span>
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<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">{</span>
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<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>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<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>
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<span class="token punctuation">}</span>
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<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">{</span>
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<span class="token function">initializeDriver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<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>
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<span class="token function">configureConnection</span><span class="token punctuation">(</span>connection<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> connection<span class="token punctuation">;</span>
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<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></code></pre><p>而对于Pooled就会处理池化的逻辑<pre class="line-numbers language-java" data-language=java><code class=language-java><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">{</span>
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<span class="token keyword">boolean</span> countedWait <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token class-name">PooledConnection</span> conn <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<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>
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<span class="token keyword">int</span> localBadConnectionCount <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<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">{</span>
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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>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<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">{</span>
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<span class="token comment">// Pool has available connection</span>
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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>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token comment">// Pool does not have available connection</span>
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<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"><</span> poolMaximumActiveConnections<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Can create new connection</span>
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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>
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<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">{</span>
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|
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>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token comment">// Cannot create new connection</span>
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<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>
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<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>
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<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">{</span>
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<span class="token comment">// Can claim overdue connection</span>
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|
state<span class="token punctuation">.</span>claimedOverdueConnectionCount<span class="token operator">++</span><span class="token punctuation">;</span>
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|
state<span class="token punctuation">.</span>accumulatedCheckoutTimeOfOverdueConnections <span class="token operator">+=</span> longestCheckoutTime<span class="token punctuation">;</span>
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|
state<span class="token punctuation">.</span>accumulatedCheckoutTime <span class="token operator">+=</span> longestCheckoutTime<span class="token punctuation">;</span>
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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>
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<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">{</span>
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|
<span class="token keyword">try</span> <span class="token punctuation">{</span>
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|
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>
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<span class="token punctuation">}</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">{</span>
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|
<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 {@link @conn} will be set as null.
|
|
*/</span>
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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>
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|
<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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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>
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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>
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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>
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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>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token comment">// Must wait</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<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">{</span>
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|
state<span class="token punctuation">.</span>hadToWaitCount<span class="token operator">++</span><span class="token punctuation">;</span>
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countedWait <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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">{</span>
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|
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>
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<span class="token punctuation">}</span>
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<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>
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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>
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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>
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<span class="token punctuation">}</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">{</span>
|
|
<span class="token comment">// set interrupt flag</span>
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|
<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>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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|
<span class="token punctuation">}</span>
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|
<span class="token punctuation">}</span>
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<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">{</span>
|
|
<span class="token comment">// ping to server and check the connection is valid or not</span>
|
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<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">{</span>
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|
<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">{</span>
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|
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>
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|
<span class="token punctuation">}</span>
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|
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>
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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>
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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>
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|
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>
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state<span class="token punctuation">.</span>requestCount<span class="token operator">++</span><span class="token punctuation">;</span>
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|
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>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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|
<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">{</span>
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|
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">}</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">{</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">{</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">}</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">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</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">}</span>
|
|
|
|
<span class="token punctuation">}</span>
|
|
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|
<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">{</span>
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|
<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">{</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">}</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">}</span>
|
|
|
|
<span class="token keyword">return</span> conn<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></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></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>它的入口不是个get方法，而是pop，从含义来来讲就不一样<br><code>org.apache.ibatis.datasource.pooled.PooledDataSource#getConnection()</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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|
<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">{</span>
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|
<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>
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|
<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span></span></code></pre><p>对于具体怎么获取连接我们可以下一篇具体讲下</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/ itemprop=url>mybatis系列-typeAliases系统</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 itemprop="dateCreated datePublished" title="创建时间：2023-01-01 20:07:42 / 修改时间：20:08:24" datetime=2023-01-01T20:07:42+08:00>2023-01-01</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 class="post-meta-item leancloud_visitors" data-flag-title=mybatis系列-typeAliases系统 id=/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/ 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 href=/2023/01/01/mybatis%E7%B3%BB%E5%88%97-typeAliases%E7%B3%BB%E7%BB%9F/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/01/01/mybatis系列-typeAliases系统/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>其实前面已经聊到过这个概念，在mybatis的配置中，以及一些初始化逻辑都是用了typeAliases，<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"><</span>typeAliases</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Author<span class="token punctuation">"</span></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>domain.blog.Author<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Blog<span class="token punctuation">"</span></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>domain.blog.Blog<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Comment<span class="token punctuation">"</span></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>domain.blog.Comment<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Post<span class="token punctuation">"</span></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>domain.blog.Post<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Section<span class="token punctuation">"</span></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>domain.blog.Section<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>typeAlias</span> <span class="token attr-name">alias</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Tag<span class="token punctuation">"</span></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>domain.blog.Tag<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>typeAliases</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></code></pre><p>可以在这里注册类型别名，然后在mybatis中配置使用时，可以简化这些类型的使用，其底层逻辑主要是一个map，<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">TypeAliasRegistry</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span><span class="token punctuation">></span></span> typeAliases <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"><</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></code></pre><p>以string作为key，class对象作为value，比如我们在一开始使用的配置文件<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"><</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>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</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>${driver}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>url<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${url}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</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>${username}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>${password}<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dataSource</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></code></pre><p>这里使用的dataSource是POOLED，那它肯定是个别名或者需要对应处理<br>而这个别名就是在Configuration的构造方法里初始化<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">{</span>
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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>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"MANAGED"</span><span class="token punctuation">,</span> <span class="token class-name">ManagedTransactionFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JNDI"</span><span class="token punctuation">,</span> <span class="token class-name">JndiDataSourceFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"POOLED"</span><span class="token punctuation">,</span> <span class="token class-name">PooledDataSourceFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"UNPOOLED"</span><span class="token punctuation">,</span> <span class="token class-name">UnpooledDataSourceFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"PERPETUAL"</span><span class="token punctuation">,</span> <span class="token class-name">PerpetualCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"FIFO"</span><span class="token punctuation">,</span> <span class="token class-name">FifoCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"LRU"</span><span class="token punctuation">,</span> <span class="token class-name">LruCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"SOFT"</span><span class="token punctuation">,</span> <span class="token class-name">SoftCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"WEAK"</span><span class="token punctuation">,</span> <span class="token class-name">WeakCache</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"DB_VENDOR"</span><span class="token punctuation">,</span> <span class="token class-name">VendorDatabaseIdProvider</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"XML"</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>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"RAW"</span><span class="token punctuation">,</span> <span class="token class-name">RawLanguageDriver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"SLF4J"</span><span class="token punctuation">,</span> <span class="token class-name">Slf4jImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"COMMONS_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">JakartaCommonsLoggingImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"LOG4J"</span><span class="token punctuation">,</span> <span class="token class-name">Log4jImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"LOG4J2"</span><span class="token punctuation">,</span> <span class="token class-name">Log4j2Impl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JDK_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">Jdk14LoggingImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"STDOUT_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">StdOutImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"NO_LOGGING"</span><span class="token punctuation">,</span> <span class="token class-name">NoLoggingImpl</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"CGLIB"</span><span class="token punctuation">,</span> <span class="token class-name">CglibProxyFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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typeAliasRegistry<span class="token punctuation">.</span><span class="token function">registerAlias</span><span class="token punctuation">(</span><span class="token string">"JAVASSIST"</span><span class="token punctuation">,</span> <span class="token class-name">JavassistProxyFactory</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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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>
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languageRegistry<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span><span class="token class-name">RawLanguageDriver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<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></code></pre><p>正是通过<code>typeAliasRegistry.registerAlias("POOLED", PooledDataSourceFactory.class);</code>这一行，注册了<br><code>POOLED</code>对应的别名类型是<code>PooledDataSourceFactory.class</code><br>具体的注册方法是在<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">registerAlias</span><span class="token punctuation">(</span><span class="token class-name">String</span> alias<span class="token punctuation">,</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> value<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<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">{</span>
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<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">"The parameter alias cannot be null"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// issue #748</span>
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<span class="token comment">// 转换成小写，</span>
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<span class="token class-name">String</span> key <span class="token operator">=</span> alias<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>
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<span class="token comment">// 判断是否已经注册过了</span>
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<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 operator">&&</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 operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&&</span> <span class="token operator">!</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 function">equals</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<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">"The alias '"</span> <span class="token operator">+</span> alias <span class="token operator">+</span> <span class="token string">"' is already mapped to the value '"</span> <span class="token operator">+</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 function">getName</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>
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<span class="token punctuation">}</span>
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<span class="token comment">// 放进map里</span>
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typeAliases<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> value<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<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></code></pre><p>而获取的逻辑在这<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"><</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"><</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">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<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">{</span>
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<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// issue #748</span>
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<span class="token comment">// 同样的转成小写</span>
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<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>
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<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> value<span class="token punctuation">;</span>
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<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">{</span>
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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"><</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>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token comment">// 这里还有从路径下处理的逻辑</span>
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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"><</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>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> value<span class="token punctuation">;</span>
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<span class="token punctuation">}</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">{</span>
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<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>
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<span class="token punctuation">}</span>
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<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></code></pre><p>逻辑比较简单，但是在mybatis中也是不可或缺的一块概念</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/ itemprop=url>docker比一般多一点的初学者介绍四</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 itemprop="dateCreated datePublished" title="创建时间：2022-12-25 19:40:28 / 修改时间：19:41:57" datetime=2022-12-25T19:40:28+08:00>2022-12-25</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/Docker/ itemprop=url rel=index><span itemprop=name>Docker</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title=docker比一般多一点的初学者介绍四 id=/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/ 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 href=/2022/12/25/docker%E6%AF%94%E4%B8%80%E8%88%AC%E5%A4%9A%E4%B8%80%E7%82%B9%E7%9A%84%E5%88%9D%E5%AD%A6%E8%80%85%E4%BB%8B%E7%BB%8D%E5%9B%9B/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2022/12/25/docker比一般多一点的初学者介绍四/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>这次单独介绍下docker体系里非常重要的cgroup，docker对资源的限制也是基于cgroup构建的，<br>简单尝试<br>新建一个shell脚本<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token shebang important">#!/bin/bash</span>
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<span class="token keyword">while</span> <span class="token boolean">true</span><span class="token punctuation">;</span><span class="token keyword">do</span>
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<span class="token builtin class-name">echo</span> <span class="token string">"1"</span>
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<span class="token keyword">done</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span></span></code></pre><p>直接执行的话就是单核100%的cpu<br><img data-src=https://img.nicksxs.com/blog/rFp7D1.jpg><p>首先在cgroup下面建个目录<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token function">mkdir</span> <span class="token parameter variable">-p</span> /sys/fs/cgroup/cpu/sxs_test/<span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>查看目录下的文件<br><img data-src=https://img.nicksxs.com/blog/b6UwLR.jpg><br>其中cpuacct开头的表示cpu相关的统计信息，<br>我们要配置cpu的额度，是在cpu.cfs_quota_us中<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token builtin class-name">echo</span> <span class="token number">2000</span> <span class="token operator">></span> /sys/fs/cgroup/cpu/sxs_test/cpu.cfs_quota_us <span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这样表示可以使用2%的cpu，总的配额是在cpu.cfs_period_us中<br><img data-src=https://img.nicksxs.com/blog/oikqB8.png><p>然后将当前进程输入到cgroup.procs,<pre class="line-numbers language-bash" data-language=bash><code class=language-bash><span class="token builtin class-name">echo</span> <span class="token variable">$$</span> <span class="token operator">></span> /sys/fs/cgroup/cpu/sxs_test/cgroup.procs<span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这样就会自动继承当前进程产生的新进程<br>再次执行就可以看到cpu被限制了<br><img data-src=https://img.nicksxs.com/blog/W0ptVg.png></div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/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/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link 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/ itemprop=url>mybatis系列-第一条sql的更多细节</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 itemprop="dateCreated datePublished" title="创建时间：2022-12-18 21:42:38" datetime=2022-12-18T21:42:38+08:00>2022-12-18</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 class="post-meta-item leancloud_visitors" data-flag-title=mybatis系列-第一条sql的更多细节 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/ 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 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 title=disqus><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<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> ，<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<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<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"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<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>
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<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>
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<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>再往下的逻辑在 <code>parseScriptNode</code> 中，<code>org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseScriptNode</code><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">{</span>
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<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>
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<span class="token class-name">SqlSource</span> sqlSource<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>isDynamic<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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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>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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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>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> sqlSource<span class="token punctuation">;</span>
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<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></code></pre><p>首先要解析<code>dynamicTag</code>，调用了<code>org.apache.ibatis.scripting.xmltags.XMLScriptBuilder#parseDynamicTags</code><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">{</span>
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<span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</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"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<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>
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<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"><</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">{</span>
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<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>
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<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">{</span>
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<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>
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<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>
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<span class="token comment">// ---------> 主要是这边的逻辑</span>
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<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">{</span>
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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>
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isDynamic <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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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>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</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">{</span> <span class="token comment">// issue #628</span>
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<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>
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<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>
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<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">{</span>
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<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 <"</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>
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<span class="token punctuation">}</span>
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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>
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isDynamic <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<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>
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<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></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><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">{</span>
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<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>
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<span class="token comment">// ----------> 主要是这里的方法</span>
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<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>
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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>
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<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>
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<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></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>${</code> , <code>}</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token class-name">GenericTokenParser</span> <span class="token function">createParser</span><span class="token punctuation">(</span><span class="token class-name">TokenHandler</span> handler<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">GenericTokenParser</span><span class="token punctuation">(</span><span class="token string">"${"</span><span class="token punctuation">,</span> <span class="token string">"}"</span><span class="token punctuation">,</span> handler<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</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><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><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>
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```java
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但是这不是一个真实可用的 `sqlSource` ，
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实际创建的时候会走到这
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```java
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<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"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<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>
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<span class="token punctuation">}</span>
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<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"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> parameterType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<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>
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<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</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>
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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"><</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>
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<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></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<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"><</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"><</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">{</span>
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|
<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>
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<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">"#{"</span><span class="token punctuation">,</span> <span class="token string">"}"</span><span class="token punctuation">,</span> handler<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">String</span> sql<span class="token punctuation">;</span>
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<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">{</span>
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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>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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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>
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<span class="token punctuation">}</span>
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<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>
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<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></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 = #{id}</code> 的 <code>sql</code> 解析成了<code>select * from student where id = ?</code> 然后创建了<code>StaticSqlSource</code><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"><</span><span class="token class-name">ParameterMapping</span><span class="token punctuation">></span></span> parameterMappings<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>sql <span class="token operator">=</span> sql<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>parameterMappings <span class="token operator">=</span> parameterMappings<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>configuration <span class="token operator">=</span> configuration<span class="token punctuation">;</span>
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<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>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<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation"><</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"><</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">{</span>
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<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>
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<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>
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<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>
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<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></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><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">{</span>
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<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>
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<span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</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>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<span class="token comment">// check for nested result maps in parameter mappings (issue #30)</span>
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<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">{</span>
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<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>
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<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">{</span>
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<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>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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|
<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> boundSql<span class="token punctuation">;</span>
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|
<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></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<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<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">{</span>
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<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>
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<span class="token punctuation">}</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> ，<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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|
<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">{</span>
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|
<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>
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<span class="token punctuation">}</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<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"><</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">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>sql <span class="token operator">=</span> sql<span class="token punctuation">;</span>
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|
<span class="token keyword">this</span><span class="token punctuation">.</span>parameterMappings <span class="token operator">=</span> parameterMappings<span class="token punctuation">;</span>
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|
<span class="token keyword">this</span><span class="token punctuation">.</span>parameterObject <span class="token operator">=</span> parameterObject<span class="token punctuation">;</span>
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|
<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"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<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>
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|
<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></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<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"><</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"><</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">{</span>
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|
<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">{</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>
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<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>
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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>
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<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>
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<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
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<span class="token function">closeStatement</span><span class="token punctuation">(</span>stmt<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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></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<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">{</span>
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<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">{</span>
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<span class="token keyword">case</span> <span class="token constant">STATEMENT</span><span class="token operator">:</span>
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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>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token keyword">case</span> <span class="token constant">PREPARED</span><span class="token operator">:</span>
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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>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token keyword">case</span> <span class="token constant">CALLABLE</span><span class="token operator">:</span>
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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>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token keyword">default</span><span class="token operator">:</span>
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<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>
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<span class="token punctuation">}</span>
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<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></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<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation"><</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"><</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">{</span>
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<span class="token class-name">Statement</span> stmt <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<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>
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<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>
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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>
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<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>
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<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
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<span class="token function">closeStatement</span><span class="token punctuation">(</span>stmt<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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></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)<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation"><</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"><</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">{</span>
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<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>
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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>
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<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>
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<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></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<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"><</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<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">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token comment">// issue #117 read properties first</span>
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<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>
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<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>
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<span class="token function">loadCustomVfs</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">loadCustomLogImpl</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<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>
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<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>
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<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>
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<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>
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<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>
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<span class="token function">settingsElement</span><span class="token punctuation">(</span>settings<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// read it after objectFactory and objectWrapperFactory issue #631</span>
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<span class="token comment">// ----------> 就是这里</span>
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<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>
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<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>
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<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>
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<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>
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<span class="token punctuation">}</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">{</span>
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<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>
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<span class="token punctuation">}</span>
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<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></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<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">{</span>
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<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">{</span>
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<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">{</span>
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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>
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<span class="token punctuation">}</span>
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<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">{</span>
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<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>
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<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">{</span>
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<span class="token comment">// -------> 找到这里</span>
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<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>
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<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>
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<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>
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<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>
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<span class="token punctuation">.</span><span class="token function">transactionFactory</span><span class="token punctuation">(</span>txFactory<span class="token punctuation">)</span>
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<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>
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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>
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<span class="token keyword">break</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<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></code></pre><p>是通过以下方法获取的，<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>
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<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">{</span>
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<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">{</span>
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<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>
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<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>
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<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>
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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>
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<span class="token keyword">return</span> factory<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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>
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<span class="token punctuation">}</span>
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<span class="token comment">// 方法全限定名 org.apache.ibatis.builder.BaseBuilder#resolveClass</span>
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<span class="token keyword">protected</span> <span class="token generics"><span class="token punctuation"><</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"><</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">{</span>
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<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">{</span>
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<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<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>
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<span class="token punctuation">}</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">{</span>
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|
<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>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 方法全限定名 org.apache.ibatis.builder.BaseBuilder#resolveAlias</span>
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<span class="token keyword">protected</span> <span class="token generics"><span class="token punctuation"><</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"><</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">{</span>
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<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>
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<span class="token punctuation">}</span>
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<span class="token comment">// 方法全限定名 org.apache.ibatis.type.TypeAliasRegistry#resolveAlias</span>
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<span class="token keyword">public</span> <span class="token generics"><span class="token punctuation"><</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"><</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">{</span>
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|
<span class="token keyword">try</span> <span class="token punctuation">{</span>
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|
<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">{</span>
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|
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
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<span class="token comment">// issue #748</span>
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<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>
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<span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> value<span class="token punctuation">;</span>
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|
<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">{</span>
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|
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"><</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>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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|
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"><</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>
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|
<span class="token punctuation">}</span>
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|
<span class="token keyword">return</span> value<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</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">{</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">}</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></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<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">{</span>
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|
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<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">{</span>
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|
<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">{</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<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">{</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">}</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 ,<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">{</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">{</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">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> connection<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></code></pre><p>即调用了<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">{</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">{</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">}</span>
|
|
<span class="token keyword">return</span> connection<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</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">{</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">{</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">}</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">{</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">}</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">}</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">{</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">}</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">{</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">{</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">{</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">{</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">{</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">}</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</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"><</span> poolMaximumActiveConnections<span class="token punctuation">)</span> <span class="token punctuation">{</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">{</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">}</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</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">{</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">{</span>
|
|
<span class="token keyword">try</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 function">rollback</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">catch</span> <span class="token punctuation">(</span><span class="token class-name">SQLException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</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 {@link @conn} 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">}</span>
|
|
<span class="token punctuation">}</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">{</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">}</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
|
|
<span class="token comment">// Must wait</span>
|
|
<span class="token keyword">try</span> <span class="token punctuation">{</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">{</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">}</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">{</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">}</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">}</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">{</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">}</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>conn <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</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">{</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">{</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">}</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">}</span> <span class="token keyword">else</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">{</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">}</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">{</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">{</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">}</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">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</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">}</span>
|
|
|
|
<span class="token punctuation">}</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">{</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">{</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">}</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">}</span>
|
|
|
|
<span class="token keyword">return</span> conn<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></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></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<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">{</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">}</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">{</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">{</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">}</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">{</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">}</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">{</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">}</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">}</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<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">{</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">}</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">{</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">}</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"><</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">{</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">{</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">{</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">}</span>
|
|
<span class="token punctuation">}</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">{</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">}</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">{</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">{</span>
|
|
<span class="token keyword">try</span> <span class="token punctuation">{</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">{</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">}</span>
|
|
<span class="token punctuation">}</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">{</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">{</span>
|
|
reason <span class="token operator">=</span> ex<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</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">}</span>
|
|
|
|
<span class="token punctuation">}</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">{</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">}</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">}</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=com.mysql.cj.jdbc.Driver@64030b91]<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">{</span>
|
|
<span class="token keyword">try</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">try</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 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">{</span>
|
|
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</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">{</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">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</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">{</span>
|
|
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</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">{</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">{</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">}</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">}</span>
|
|
<span class="token punctuation">}</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">{</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">}</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></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<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">{</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">}</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<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">{</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">}</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</div><footer class=post-footer><div class=post-eof></div></footer></article></div><nav class=pagination><a class="extend prev" aria-label=上一页 href=/page/8/ rel=prev title=上一页><i class="fa fa-angle-left"></i></a><a class=page-number href=/>1</a><span class=space>…</span><a class=page-number href=/page/8/>8</a><span class="page-number current">9</span><a class=page-number href=/page/10/>10</a><span class=space>…</span><a class=page-number href=/page/47/>47</a><a class="extend next" aria-label=下一页 href=/page/10/ rel=next title=下一页><i class="fa fa-angle-right"></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 alt src=/uploads/beian.png><a 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