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2023年 (2篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2023/12/21/%E4%B8%80%E6%96%87%E8%AF%A6%E8%A7%A3%E9%99%90%E6%B5%81%E6%8E%A5%E5%8F%A3%E5%AE%9E%E7%8E%B0" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>一文详解限流接口实现</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2023/01/06/CodeReview%E6%96%B9%E6%B3%95%E8%AE%BA%E4%B8%8E%E5%AE%9E%E8%B7%B5%E6%80%BB%E7%BB%93" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; display: inline-block;">2</div>阿里巴巴的Code Review方法论与实践总结</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-802ad7d8><section class="VPSidebarItem level-0 collapsible collapsed" data-v-802ad7d8 data-v-95d837d1><div class="item" role="button" tabindex="0" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><h2 class="text" data-v-95d837d1><img class="chinese-zodiac" style="position: static; vertical-align: middle; padding-bottom: 3px;" src="/img/svg/chinese-zodiac/tiger.svg" title="虎年" alt="生肖">
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2022年 (15篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/12/07/%E7%BD%91%E7%AB%99%E5%BC%80%E5%90%AF%E7%81%B0%E8%89%B2%E6%98%BE%E7%A4%BA" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>简单聊聊如何让网站开启灰色显示</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/11/01/%E4%BD%BF%E7%94%A8IDEA%E8%BF%9B%E8%A1%8C%E8%BF%9C%E7%A8%8B%E7%A8%8B%E5%BA%8F%E8%B0%83%E8%AF%95" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; display: inline-block;">2</div>使用 IntelliJ IDEA 进行远程程序调试</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/31/CentOS%E5%AE%89%E8%A3%85Docker" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-yellow mr-[6px]" style="font-weight: 550; display: inline-block;">3</div>CentOS 安装 Docker、Docker Compose</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/28/Docker%E5%AE%89%E8%A3%85MinIO" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">4</div>Docker 安装 MinIO 详细步骤</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/27/Docker%E5%AE%89%E8%A3%85Consul" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">5</div>Docker 安装 Consul 详细步骤</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/26/Docker%E5%AE%89%E8%A3%85OpenLDAP" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">6</div>Docker 安装 OpenLDAP 详细步骤</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/06/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8%E5%BF%AB%E6%8D%B7%E9%94%AE" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">7</div>个人常用快捷键</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/05/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Git%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">8</div>个人常用 Git 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/01/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Docker%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">9</div>个人常用 Docker 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/08/29/%E5%86%85%E7%BD%91CentOS%E6%9C%8D%E5%8A%A1%E5%99%A8%E8%AE%BE%E7%BD%AE%E7%BD%91%E7%BB%9C%E4%BB%A3%E7%90%86" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">10</div>内网CentOS服务器设置网络代理</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/28/%E4%B8%BA%E6%8C%87%E5%AE%9AGit%E4%BB%93%E5%BA%93%E5%8D%95%E7%8B%AC%E9%85%8D%E7%BD%AE%E7%94%A8%E6%88%B7%E5%90%8D%E5%92%8C%E9%82%AE%E7%AE%B1" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">11</div>为指定Git仓库单独配置用户名和邮箱</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/27/%E4%BF%AE%E6%94%B9Git%E6%89%80%E6%9C%89%E6%8F%90%E4%BA%A4%E8%AE%B0%E5%BD%95%E4%B8%AD%E7%9A%84%E4%BD%9C%E8%80%85%E5%92%8C%E9%82%AE%E7%AE%B1" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">12</div>修改Git所有提交记录中的作者和邮箱</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/26/%E4%BF%AE%E6%94%B9Git%E6%9C%80%E5%90%8E%E4%B8%80%E6%AC%A1%E6%8F%90%E4%BA%A4%E8%AE%B0%E5%BD%95%E7%9A%84%E4%BD%9C%E8%80%85%E5%92%8C%E9%82%AE%E7%AE%B1" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">13</div>修改Git最后一次提交记录的作者和邮箱</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/25/%E5%90%88%E5%B9%B6%E4%B8%A4%E4%B8%AAGit%E4%BB%93%E5%BA%93%E7%9A%84%E5%8E%86%E5%8F%B2%E6%8F%90%E4%BA%A4%E8%AE%B0%E5%BD%95" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">14</div>合并两个Git仓库的历史提交记录</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/02/16/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8SQL%E5%87%BD%E6%95%B0" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">15</div>个人常用 SQL 函数</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-802ad7d8><section class="VPSidebarItem level-0 collapsible collapsed" data-v-802ad7d8 data-v-95d837d1><div class="item" role="button" tabindex="0" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><h2 class="text" data-v-95d837d1><img class="chinese-zodiac" style="position: static; vertical-align: middle; padding-bottom: 3px;" src="/img/svg/chinese-zodiac/ox.svg" title="牛年" alt="生肖">
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2021年 (2篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2021/05/29/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F%E4%B9%8B%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>设计模式之单例模式</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2021/03/12/%E7%B2%BE%E5%AF%86%E8%AE%A1%E7%AE%97%E5%B7%A5%E5%85%B7%E7%B1%BB-BigDecimal" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; display: inline-block;">2</div>精密计算工具类-BigDecimal</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-802ad7d8><section class="VPSidebarItem level-0 collapsible collapsed" data-v-802ad7d8 data-v-95d837d1><div class="item" role="button" tabindex="0" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><h2 class="text" data-v-95d837d1><img class="chinese-zodiac" style="position: static; vertical-align: middle; padding-bottom: 3px;" src="/img/svg/chinese-zodiac/pig.svg" title="猪年" alt="生肖">
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2019年 (4篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/31/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Linux%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>个人常用 Linux 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/30/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Hutool%E5%B7%A5%E5%85%B7%E7%B1%BB" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; display: inline-block;">2</div>个人常用 Hutool 工具类</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/29/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Stream%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-yellow mr-[6px]" style="font-weight: 550; display: inline-block;">3</div>个人常用 Stream 使用技巧</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/28/%E4%B8%AA%E4%BA%BASQL%E4%BC%98%E5%8C%96%E6%8A%80%E5%B7%A7" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">4</div>个人 SQL 优化技巧</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-03322d68 data-v-2c336b25><div class="VPDoc has-sidebar has-aside" data-v-2c336b25 data-v-53ed897c><!--[--><!--]--><div class="container" data-v-53ed897c><div class="aside" data-v-53ed897c><div class="aside-curtain" data-v-53ed897c></div><div class="aside-container" data-v-53ed897c><div class="aside-content" data-v-53ed897c><div class="VPDocAside" data-v-53ed897c data-v-3d450548><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-3d450548 data-v-70b38f01><div class="content" data-v-70b38f01><div class="outline-marker" data-v-70b38f01></div><div class="outline-title" role="heading" aria-level="2" data-v-70b38f01>目录</div><nav aria-labelledby="doc-outline-aria-label" data-v-70b38f01><span class="visually-hidden" id="doc-outline-aria-label" data-v-70b38f01> Table of Contents for current page </span><ul class="root" data-v-70b38f01 data-v-e10534d6><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-3d450548></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-53ed897c><div class="content-container" data-v-53ed897c><!--[--><!--]--><!----><main class="main" data-v-53ed897c><div style="position:relative;" class="vp-doc _categories_fragments_2023_01_06_CodeReview%E6%96%B9%E6%B3%95%E8%AE%BA%E4%B8%8E%E5%AE%9E%E8%B7%B5%E6%80%BB%E7%BB%93" data-v-53ed897c><div><h1 id="阿里巴巴的code-review方法论与实践总结" tabindex="-1">阿里巴巴的Code Review方法论与实践总结 <a class="header-anchor" href="#阿里巴巴的code-review方法论与实践总结" aria-label="Permalink to "阿里巴巴的Code Review方法论与实践总结""></a></h1><!----><p>作为卓越工程文化的一部分，Code Review 其实一直在进行中，只是各团队根据自身情况张驰有度，松紧可能也不一，这里简单梳理一下 CR 的方法和团队实践。</p><h2 id="为什么要cr" tabindex="-1">为什么要CR <a class="header-anchor" href="#为什么要cr" aria-label="Permalink to "为什么要CR""></a></h2><ul><li><strong>提前发现缺陷</strong> 在CodeReview阶段发现的逻辑错误、业务理解偏差、性能隐患等时有发生，CR可以提前发现问题。</li><li><strong>提高代码质量</strong> 主要体现在代码健壮性、设计合理性、代码优雅性等方面，持续CodeReview可以提升团队整体代码质量。</li><li><strong>统一规范和风格</strong> 集团编码规范自不必说，对于代码风格要不要统一，可能会有不同的看法，个人观点对于风格也不强求。但代码其实不是写给自己看的，是写给下一任看的，就像经常被调侃的“程序员不喜欢写注释，更不喜欢别人不写注释”，代码风格的统一更有助于代码的可读性及继任者的快速上手。</li><li><strong>防止架构腐烂</strong> 架构的维护者是谁？仅靠架构师或应用Owner是远远不够的，需要所有成员的努力，所谓人人都是架构师。架构防腐最好前置在设计阶段，但CodeReview作为对最终产出代码的检查，也算是最后一道关键工序。</li><li><strong>知识分享</strong> 每一次CodeReview，都是一次知识的分享，磨合一定时间后，团队成员间会你中有我、我中有你，集百家之所长，融百家之所思。同时，业务逻辑都在代码中，团队CodeReview也是一种新人业务细节学习的途径。</li><li><strong>团队共识</strong> 通过多次讨论与交流，逐步达成团队共识，特别是对架构理解和设计原则的认知，在共识的基础上团队也会更有凝聚力，特别是在较多新人加入时尤为重要。</li></ul><h2 id="他山之石" tabindex="-1">他山之石 <a class="header-anchor" href="#他山之石" aria-label="Permalink to "他山之石""></a></h2><h3 id="某大厂a" tabindex="-1">某大厂A <a class="header-anchor" href="#某大厂a" aria-label="Permalink to "某大厂A""></a></h3><p>非常重视 Code Review，基本上代码需要至少有两位以上 Reviewer 审核通过后，才会让你 Check In。</p><h4 id="代码评审规则" tabindex="-1">代码评审规则 <a class="header-anchor" href="#代码评审规则" aria-label="Permalink to "代码评审规则""></a></h4><ul><li>如果变更达到可以提升系统整体代码质量的程度，就可以让它们通过，即使它们可能还不完美。这是所有代码评审准则的最高原则。</li><li>世界上没有“完美”的代码，只有更好的代码。<strong>评审者不应该要求代码提交者在每个细节都写得很完美。评审者应该做好修改时间与修改重要性之间的权衡。</strong></li></ul><h4 id="代码评审原则" tabindex="-1">代码评审原则 <a class="header-anchor" href="#代码评审原则" aria-label="Permalink to "代码评审原则""></a></h4><ul><li>以客观的技术因素与数据为准，而非个人偏好。</li><li>在代码样式上，遵从代码样式指南，所有代码都应与其保持一致，任何与代码样式指南不一致的观点都是个人偏好。但如果某项代码样式在指南中未提及，那就接受作者的样式。</li><li>任务涉及软件设计的问题，都应取决于基本设计原则，而不应由个人喜好来决定。当同时有多种可行方案时，如果作者能证明（以数据或公认的软件工程原理为依据）这些方案基本差不多，那就接受作者的选项；否则，应由标准的软件设计原则为准。</li><li>如果没有可用的规则，那么审核者应该让作者与当前代码库保持一致，至少不会恶化代码系统的质量。（一旦恶化代码质量，就会带来<strong>破窗效应</strong>，导致系统的代码质量逐渐下降）</li></ul><h4 id="代码审核者应该看什么" tabindex="-1">代码审核者应该看什么 <a class="header-anchor" href="#代码审核者应该看什么" aria-label="Permalink to "代码审核者应该看什么""></a></h4><ul><li><strong>设计</strong>：代码是否设计良好？这种设计是否适合当前系统？</li><li><strong>功能</strong>：代码实现的行为与作者的期望是否相符？代码实现的交互界面是否对用户友好？</li><li><strong>复杂性</strong>：代码可以更简单吗？如果将来有其他开发者使用这段代码，他能很快理解吗？</li><li><strong>测试</strong>：这段代码是否有正确的、设计良好的自动化测试？</li><li><strong>命名</strong>：在为变量、类名、方法等命名时，开发者使用的名称是否清晰易懂？</li><li><strong>注释</strong>：所有的注释是否都一目了然？</li><li><strong>代码样式</strong>：所有的代码是否都遵循代码样式？</li><li><strong>文档</strong>：开发者是否同时更新了相关文档？</li></ul><h3 id="某大厂b" tabindex="-1">某大厂B <a class="header-anchor" href="#某大厂b" aria-label="Permalink to "某大厂B""></a></h3><ul><li>在开发流程上专门有这个环节，排期会明确排进日程，比如 5 天开发会排 2 天来做代码审核，分为代码自审、交叉审核、集中审核。</li><li>有明确的量化指标，如 8 人时审核/每千行代码，8 个以上非提示性有效问题/每千行代码。</li></ul><h3 id="某大厂c" tabindex="-1">某大厂C <a class="header-anchor" href="#某大厂c" aria-label="Permalink to "某大厂C""></a></h3><ul><li>推行 Code Owner 机制，每个代码变更必须有 Code Owner 审核通过才可以提交。</li><li>所有的一线工程师，无论职级高低，最重要的工程输出原则是 “show me the code”，而 Code Review 是最能够反应这个客观输出的。</li><li>尽量让每个人的 Code Review 参与状况都公开透明，每个变更发送给项目合作者，及转发到小组内成员，小组内任何人都可以去 Review 其他人的代码。</li><li>明确每个人的考评和 Code Review 表现相关，包括 Code Review 输出状况及提交代码的质量等。</li></ul><h2 id="我们怎么做cr" tabindex="-1">我们怎么做CR <a class="header-anchor" href="#我们怎么做cr" aria-label="Permalink to "我们怎么做CR""></a></h2><h3 id="作为代码提交者" tabindex="-1">作为代码提交者 <a class="header-anchor" href="#作为代码提交者" aria-label="Permalink to "作为代码提交者""></a></h3><ul><li><p><strong>发起时机</strong>：发起 Code Review 尽量提前，开发过程小步快跑</p><p><img src="/assets/202301062024211.XSdkEyRK.png" alt="202301062024211"></p></li><li><p><strong>代码行数</strong>：提交 Code Review 的代码行数最好在 400 行以下。根据数据分析发现，从代码行数来看，超过 400 行的 CR，缺陷发现率会急剧下降；从CR速度来看，超过 500 行/小时后，Review 质量也会大大降低，一个高质量的 CR 最好控制在一个小时以内。</p></li><li><p><strong>明确意图</strong>：编写语义明确的<strong>标题</strong>（必填）和<strong>描述</strong>（选填，可以包括背景、思路、改造点和影响面、风险等）</p></li><li><p><strong>善用工具</strong>：IDEA 打开编码规约实时检测，减少代码样式、编码规约等基础性问题 （阿里编码规约插件：<a href="https://github.com/alibaba/p3c/tree/master/idea-plugin%EF%BC%89" target="_blank" rel="noreferrer">https://github.com/alibaba/p3c/tree/master/idea-plugin）</a></p></li></ul><h3 id="作为代码评审者" tabindex="-1">作为代码评审者 <a class="header-anchor" href="#作为代码评审者" aria-label="Permalink to "作为代码评审者""></a></h3><h4 id="评审范围" tabindex="-1">评审范围 <a class="header-anchor" href="#评审范围" aria-label="Permalink to "评审范围""></a></h4><p>主要从两方面来评审：</p><ul><li>代码逻辑 <ul><li><strong>功能完整</strong>：代码实现是否满足功能需求，实现上有没有需求的理解偏差，对用户是否友好；</li><li><strong>逻辑设计</strong>：是否考虑了全局设计和兼容现有业务细节，是否考虑边界条件和并发控制；</li><li><strong>安全隐患</strong>：是否存在数据安全隐患及敏感信息泄漏，如越权、SQL 注入、CSRF、敏感信息未脱敏等；</li><li><strong>性能隐患</strong>：是否存在损害性能的隐患，如死锁、死循环、FullGC、慢 SQL、缓存数据热点等；</li><li><strong>测试用例</strong>：单元测试用例的验证逻辑是否有效，测试用例的代码行覆盖率和分支覆盖率；</li></ul></li><li>代码质量 <ul><li><strong>编码规范</strong>：命名、注释、领域术语、架构分层、日志打印、代码样式等是否符合规范</li><li><strong>可读性</strong>：是否逻辑清晰、易理解，避免使用奇淫巧技，避免过度拆分</li><li><strong>简洁性</strong>：是否有重复可简化的复杂逻辑，代码复杂度是否过高，符合 KISS 和 DRY 原则</li><li><strong>可维护性</strong>：在可读性和简洁性基础上，是否分层清晰、模块化合理、高内聚低耦合、遵从基本设计原则</li><li><strong>可扩展性</strong>：是否仅仅是满足一次性需求的代码，是否有必要的前瞻性扩展设计</li><li><strong>可测试性</strong>：代码是否方便写单元测试及分支覆盖，是否便于自动化测试</li></ul></li></ul><h4 id="评审注意事项" tabindex="-1">评审注意事项 <a class="header-anchor" href="#评审注意事项" aria-label="Permalink to "评审注意事项""></a></h4><ul><li>尽快完成评审</li><li>避免过度追求完美</li><li>明确评论是否要解决</li><li>避免使用反问句来评价</li></ul><p>我们主要是通过交叉 CR、集中 CR 相结合的方式，由应用 Owner + SM + 架构师 + TL 完成。</p><h2 id="cr怎么避免流于形式" tabindex="-1">CR怎么避免流于形式 <a class="header-anchor" href="#cr怎么避免流于形式" aria-label="Permalink to "CR怎么避免流于形式""></a></h2><p>CR 流于形式的因素很多，大概如下：</p><ul><li><p><strong>不认同 CodeReview</strong></p><ul><li>评审者的姿态？有没有带来好处？有没有从中收获？这些都会直观影响团队成员的认可度</li><li>每个 Review 建议的提出都是一次思想交流，评论要友好、中肯、具体，避免教条式及负面词汇，在遵守评审原则下，同时尊重个性展现</li><li>团队集中 CodeReview 尽量不要太正式和严肃，轻松的气氛下更有助于互相理解，来点水果，聊聊业务聊聊代码</li><li>在 Review 过程有时候会陷入谁对谁错的争论，只要是为了寻求真理辩证的去看问题，哪怕是讨论再激烈也是有收获的，注意只对事不对人。</li></ul></li><li><p><strong>CodeReview 后改动太大</strong></p><ul><li>发布前发现问题多，改动太大，影响项目计划</li><li>大项目要求编码前设计评审，小需求可以事先 Review 设计思路，避免最后的惊喜</li><li>每次 Review 的代码行数最好控制在数百行以内</li></ul></li><li><p><strong>评审者没有足够时间</strong></p><ul><li>评审者在任务安排上尽量预留好时间</li><li>尽快评审，代码在百行以内及时响应，在千行以内当日完结</li></ul></li><li><p><strong>评审者不了解业务和代码</strong></p><ul><li>代码提交人编写清晰的标题和描述</li><li>有必要的情况下评审者需要了解 PRD</li><li>评审者需要提前了解系统和代码</li></ul></li><li><p><strong>Review 建议未修改</strong></p><ul><li>这一点极为重要，需要对修改后的代码再次 Review，确保理解一致，以及预防带问题上线</li><li>应用可以设置 Review 建议需全部解决的卡点，同时对于非必需修改的建议可以进行打标或说明</li></ul></li></ul><h2 id="cr实践中发现的几个常见代码问题" tabindex="-1">CR实践中发现的几个常见代码问题 <a class="header-anchor" href="#cr实践中发现的几个常见代码问题" aria-label="Permalink to "CR实践中发现的几个常见代码问题""></a></h2><p>笔者对个人 CR 评论问题做了个大概统计，Bug 发现数占比约 4%（直接或潜在 Bug），重复代码数占比约 5%，其他还有规范、安全、性能、设计等问题。在 CR 代码质量时，可以参考《重构：改善既有代码的设计》，书中所列的 22 种坏味道在 CR 中基本都会遇到。而此处我们主要聚焦以下几个常见问题：</p><h3 id="dry" tabindex="-1">DRY <a class="header-anchor" href="#dry" aria-label="Permalink to "DRY""></a></h3><p>DRY 是 Don't Repeat Yourself 的缩写，DRY 是 Andy Hunt 和 Dave Thomas's 在《 The Pragmatic Programmer 》一书中提出的核心原则。DRY 原则描述的重复是知识和意图的重复，包含代码重复、文档重复、数据重复、表征重复，我们这里重点讲讲<strong>代码重复</strong>。</p><h4 id="代码重复" tabindex="-1">代码重复 <a class="header-anchor" href="#代码重复" aria-label="Permalink to "代码重复""></a></h4><blockquote><p>《重构》中对 “Duplicated Code（重复代码）” 的描述：</p><p>坏味道行列中首当其冲的就是 Duplicated Code。如果你在一个以上的地点看到相同的程序结构，那么可以肯定：设法将它们合而为一，程序会变得更好。</p><p>最单纯的 Duplicated Code 就是“同一个类的两个函数含有相同的表达式”。这时候你需要做的就是采用 Extract Method (110) 提炼出重复的代码，然后让这两个地点都调用被提炼出来的那一段代码。</p><p>另一种常见情况就是“两个互为兄弟的子类内含相同表达式”。要避免这种情况，只需对两个类都使用 Extract Method (110)，然后再对被提炼出来的代码使用 Pull Up Method (332)，将它推入超类内。如果代码之间只是类似，并非完全相同，那么就得运用 Extract Method (110) 将相似部分和差异部分割开，构成单独一个函数。然后你可能发现可以运用 Form Template Method (345) 获得一个Template Method 设计模式。如果有些函数以不同的算法做相同的事，你可以选择其中较清晰的一个，并使用 Substitute Algorithm (139) 将其他函数的算法替换掉。</p><p>如果两个毫不相关的类出现 Duplicated Code，你应该考虑对其中一个使用 Extract Class (149)，将重复代码提炼到一个独立类中，然后在另一个类内使用这个新类。但是，重复代码所在的函数也可能的确只应该属于某个类，另一个类只能调用它，抑或这个函数可能属于第三个类，而另两个类应该引用这第三个类。你必须决定这个函数放在哪儿最合适，并确保它被安置后就不会再在其他任何地方出现。</p></blockquote><p>代码重复的几种场景：</p><ul><li>一个类中重复代码抽象为一个方法</li><li>两个子类间重复代码抽象到父类</li><li>两个不相关类间重复代码抽象到第三个类</li></ul><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-VGwMY" id="tab-1WujOnE" checked="checked"><label for="tab-1WujOnE">反例</label><input type="radio" name="group-VGwMY" id="tab-ZfpWRYL"><label for="tab-ZfpWRYL">正例</label></div><div class="blocks"><div class="language-java vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BillVO </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">convertBillDTO2BillVO</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(BillDTO billDTO) {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (billDTO </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BillVO</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> BillVO</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Money</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> cost</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billDTO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getCost</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (cost </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> &&</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> cost.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setCostDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">format</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"%s %s"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, cost.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getCurrency</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(), cost.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()));</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Money</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sale</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billDTO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getSale</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (sale </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> &&</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sale.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setSaleDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">format</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"%s %s"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, sale.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getCurrency</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(), sale.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()));</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Money</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> grossProfit</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billDTO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getGrossProfit</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (grossProfit </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> &&</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> grossProfit.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setGrossProfitDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">format</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"%s %s"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, grossProfit.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getCurrency</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(), grossProfit.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()));</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> final</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MONEY_DISPLAY_TEXT_PATTERN</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> "%s %s"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BillVO </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">convertBillDTO2BillVO</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(BillDTO billDTO) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (billDTO </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BillVO</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> BillVO</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setCostDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildMoneyDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(billDTO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getCost</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()));</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setSaleDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildMoneyDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(billDTO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getSale</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()));</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setGrossProfitDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildMoneyDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(billDTO.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getGrossProfit</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()));</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> billVO;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildMoneyDisplayText</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(Money money) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (money </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> ||</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> money.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> StringUtils.EMPTY;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">format</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(MONEY_DISPLAY_TEXT_PATTERN, money.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getCurrency</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(), money.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getAmount</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">().</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">toPlainString</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">());</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div></div></div><h4 id="dyr实践忠告" tabindex="-1">DYR实践忠告 <a class="header-anchor" href="#dyr实践忠告" aria-label="Permalink to "DYR实践忠告""></a></h4><ul><li>不要借用 DRY 之名，过度提前抽象，请遵循 <strong>Rule of three 原则</strong>。</li><li>不要过度追求 DRY，破坏了内聚性，实践中需要<strong>平衡复用与内聚</strong>。</li></ul><h3 id="primitive-obsession" tabindex="-1">Primitive Obsession <a class="header-anchor" href="#primitive-obsession" aria-label="Permalink to "Primitive Obsession""></a></h3><blockquote><p>《重构》中对 “Primitive Obsession（基本类型偏执）” 的描述：</p><p>大多数编程环境都有两种数据：结构类型允许你将数据组织成有意义的形式；基本类型则是构成结构类型的积木块。结构总是会带来一定的额外开销。它们可能代表着数据库中的表，如果只为做一两件事而创建结构类型也可能显得太麻烦。</p><p>对象的一个极大的价值在于：它们模糊（甚至打破）了横亘于基本数据和体积较大的类之间的界限。你可以轻松编写出一些与语言内置（基本）类型无异的小型类。例如，Java 就以基本类型表示数值，而以类表示字符串和日期——这两个类型在其他许多编程环境中都以基本类型表现。</p><p>对象技术的新手通常不愿意在小任务上运用小对象——像是结合数值和币种的 money 类、由一个起始值和一个结束值组成的 range 类、电话号码或邮政编码（ZIP)等的特殊字符串。你可以运用 Replace Data Valuewith Object (175) 将原本单独存在的数据值替换为对象，从而走出传统的洞窟，进入炙手可热的对象世界。如果想要替换的数据值是类型码，而它并不影响行为，则可以运用 Replace Type Code with Class (218) 将它换掉。如果你有与类型码相关的条件表达式，可运用 Replace Type Codewith Subclass (213) 或 Replace Type Code with State/Strategy (227) 加以处理。</p><p>如果你有一组应该总是被放在一起的字段，可运用 Extract Class(149)。如果你在参数列中看到基本型数据，不妨试试 IntroduceParameter Object (295)。如果你发现自己正从数组中挑选数据，可运用 Replace Array with Object (186)。</p></blockquote><p>给我们的启示主要有两点：</p><ul><li>大部分业务场景和语言环境下，结构化类型导致的开销基本可以忽略</li><li>结构化类型带来更清晰的语义和复用</li></ul><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-RhuQ9" id="tab-ycmU3H9" checked="checked"><label for="tab-ycmU3H9">反例</label><input type="radio" name="group-RhuQ9" id="tab-AxwCCn5"><label for="tab-AxwCCn5">正例</label></div><div class="blocks"><div class="language-java vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Data</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> XxxConfigDTO</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> implements</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> Serializable</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> final</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> serialVersionUID</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 8018480763009740953L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 租户ID</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> tenantId;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 工商税务企业类型</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> companyType;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 企业名称</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> companyName;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 企业纳税人识别号</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> companyTaxNo;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 审单员工工号</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> auditEmpNo;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 审单员工姓名</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> auditEmpName;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 跟单员工工号</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> trackEmpNo;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 跟单员工姓名</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> trackEmpName;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Data</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> XxxConfigDTO2</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> implements</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> Serializable</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> final</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> serialVersionUID</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 8018480763009740953L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 租户ID</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> tenantId;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 企业信息</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Company</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> company;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 审单员工信息</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Employee</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> auditEmployee;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 跟单员工信息</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Employee</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> trackEmployee;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Data</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Company</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 工商税务企业类型</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> companyType;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 企业名称</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> companyName;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 企业纳税人识别号</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> companyTaxNo;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Data</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Employee</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 员工工号</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> empNo;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 员工姓名</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> empName;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div></div></div><p>其实就是怎么去抽象，对于特定领域的对象可以参考 DDD 里面的 Domain Primitive（DP）。</p><h3 id="分布式锁" tabindex="-1">分布式锁 <a class="header-anchor" href="#分布式锁" aria-label="Permalink to "分布式锁""></a></h3><h4 id="未处理锁失败" tabindex="-1">未处理锁失败 <a class="header-anchor" href="#未处理锁失败" aria-label="Permalink to "未处理锁失败""></a></h4><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> void</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> process</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String orderId) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do validate</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> try</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockSuccess</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockService.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">tryLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(LockBizType.ORDER, orderId);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">lockSuccess) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // TODO 此处需要处理锁失败，重试或抛出异常</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do something</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">finally</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockService.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">unlock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(LockBizType.ORDER, orderId);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p>分布式锁的目的是为了防止并发冲突和保证数据一致性，锁失败时未处理直接返回，会带来非预期结果的影响，除非明确失败可放弃。</p><h4 id="手写解锁容易遗漏" tabindex="-1">手写解锁容易遗漏 <a class="header-anchor" href="#手写解锁容易遗漏" aria-label="Permalink to "手写解锁容易遗漏""></a></h4><p>上面的加锁和解锁都是手动编写，而这两个动作一般是成对出现的，在手动编写时容易发生遗漏解锁而导致线上问题，推荐封装一个加解锁的方法来实现，会更加安全和便利。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> void</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> procoess</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String orderId) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do validate</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> processSuccess</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockService.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">executeWithLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(LockBizType.ORDER, orderId, () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">-></span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> doProcess</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(orderId));</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do something</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Boolean </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">doProcess</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String orderId) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do something</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Boolean.TRUE;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// LockService</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> <</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">T</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">></span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> T </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">executeWithLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(LockBizType bizType, String bizId, Supplier</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"><</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">T</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">></span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> supplier) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> executeWithLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(bizType, bizId, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">60</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">3</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, supplier);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> <</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">T</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">></span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> T </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">execteWithLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(LockBizType bizType, String bizId, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> expireSeconds, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> retryTimes, Supplier</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"><</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">T</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">></span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> supplier) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 尝试加锁</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockTimes</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lock</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> tryLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(bizType, bizId, expireSeconds);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> while</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(lockTimes </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"><</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> retryTimes </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&&</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> !</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">lock) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> try</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Thread.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">sleep</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">10</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">catch</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (Exception </span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">e</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do something</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lock </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> tryLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(bizType, bizId, expireSeconds);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockTimes</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 锁失败抛异常</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">lock) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> throw</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> LockException</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"try lock fail"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 解锁</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> try</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> supplier.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">get</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">finally</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> unlock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(bizType, bizId);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><h4 id="加锁key无效" tabindex="-1">加锁KEY无效 <a class="header-anchor" href="#加锁key无效" aria-label="Permalink to "加锁KEY无效""></a></h4><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> void</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> process</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String orderId) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do validate</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> try</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 此处加锁类型与加锁KEY不匹配</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockSuccess</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockService.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">tryLock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(LockBizType.PRODUCT, orderId);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">lockSuccess) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // TODO 重试或抛出异常</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // do something</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">finally</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> lockService.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">unlock</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(LockBizType.PRODUCT, orderId);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p>注意加锁类型与加锁 KEY 在同一个维度，否则加锁会失效。</p><h3 id="分页查询" tabindex="-1">分页查询 <a class="header-anchor" href="#分页查询" aria-label="Permalink to "分页查询""></a></h3><h4 id="完全没有分页" tabindex="-1">完全没有分页 <a class="header-anchor" href="#完全没有分页" aria-label="Permalink to "完全没有分页""></a></h4><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-AP5Ur" id="tab-Ulq-Sal" checked="checked"><label for="tab-Ulq-Sal">反例</label><input type="radio" name="group-AP5Ur" id="tab-PwYDFq4"><label for="tab-PwYDFq4">正例</label></div><div class="blocks"><div class="language-java vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> List</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"><</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">OrderDTO</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">></span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> queryOrderList</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(Long customerId) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (customerId </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Lists.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">newArrayList</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> List</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;"><</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">OrderDO</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">> </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">orderDOList</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderMapper.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">list</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(customerId);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderConverter.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">doList2dtoList</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(orderDOList);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Page</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"><</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">OrderDTO</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">></span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> queryOrderList</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(OrderPageQuery query) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Preconditions.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">checkNotNull</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query, </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"查询条件不能为空"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Preconditions.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">checkArgument</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getPageSize</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"><=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MAX_PAGE_SIZE, </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"分页size不能大于"</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MAX_PAGE_SIZE);</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 分页size一般由前端传入</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // query.setPageSize(20);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> cnt</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderMapper.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">count</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (cnt </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> PageQueryUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildPageData</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, cnt);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> List</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;"><</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">OrderDO</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">> </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">orderDOList</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderMapper.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">list</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> List</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;"><</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">OrderDTO</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">> </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">orderDTOList</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderConverter.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">doList2dtoList</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(orderDOList);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> PageQueryUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildPageData</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query, orderDTOList, cnt);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div></div></div><p>没有分页的列表查询对DB性能影响非常大，特别是在项目初期，因为数据量非常小问题不明显，而导致没有及时发现，会给未来留坑。</p><h4 id="分页size太大" tabindex="-1">分页size太大 <a class="header-anchor" href="#分页size太大" aria-label="Permalink to "分页size太大""></a></h4><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-XZBme" id="tab-E1p8Suc" checked="checked"><label for="tab-E1p8Suc">反例</label></div><div class="blocks"><div class="language-java vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Page</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"><</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">OrderDTO</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">></span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> queryOrderList2</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(OrderPageQuery query) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Preconditions.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">checkNotNull</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query, </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"查询条件不能为空"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> query.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setPageSize</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">10000</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> cnt</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderMapper.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">count</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (cnt </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> PageQueryUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildPageData</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, cnt);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> List</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;"><</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">OrderDO</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">> </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">orderDOList</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderMapper.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">list</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> List</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;"><</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">OrderDTO</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">> </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">orderDTOList</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> orderConverter.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">doList2dtoList</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(orderDOList);</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> PageQueryUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">buildPageData</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(query, orderDTOList, cnt);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div></div></div><p>分页 size 的大小并没有一个固定的标准，取决于业务需求、数据量及数据库等，但动辄几千上万的分页 size，会带来性能瓶颈，而大量的慢 SQL 不但影响客户体验，对系统稳定性也是极大的隐患。</p><h4 id="超多分页慢sql" tabindex="-1">超多分页慢SQL <a class="header-anchor" href="#超多分页慢sql" aria-label="Permalink to "超多分页慢SQL""></a></h4><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-WMSyX" id="tab-b7LCMR0" checked="checked"><label for="tab-b7LCMR0">反例</label><input type="radio" name="group-WMSyX" id="tab-D068fkH"><label for="tab-D068fkH">正例</label></div><div class="blocks"><div class="language-xml vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">xml</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"><!-- 分页查询订单列表 --></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"><</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">select</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> id</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"list"</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> parameterType</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"com.xxx.OrderPageQuery"</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> resultType</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"com.xxx.OrderDO"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> SELECT</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> <</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">include</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> refid</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"all_columns"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">/></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> FROM t_order</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> <</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">include</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> refid</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"listConditions"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">/></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> ORDER BY id DESC</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> LIMIT #{offset},#{pageSize}</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"></</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">select</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span></code></pre></div><div class="language-xml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">xml</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"><!-- 分页查询订单列表 --></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"><</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">select</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> id</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"list"</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> parameterType</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"com.xxx.OrderPageQuery"</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> resultType</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"com.xxx.OrderDO"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> SELECT</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> <</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">include</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> refid</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"all_columns"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">/></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> FROM t_order a</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> INNER JOIN (</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> SELECT id AS bid</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> FROM t_order</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> <</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">include</span><span style="--shiki-light:#6F42C1;--shiki-dark:#6CB6FF;"> refid</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"listConditions"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">/></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> ORDER BY id DESC</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> LIMIT #{offset},#{pageSize}</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> ) b ON a.id = b.bid</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"></</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">select</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span></code></pre></div></div></div><p>以上 bad case 的 SQL 在超多页分页查询时性能极其低下，存在多次回表甚至 Using Filesort 的问题，在阿里巴巴编码规范中也有明确的规避方案，此处不展开。</p><p><img src="/assets/202301062027985.qIIuam8H.png" alt="202301062027985"></p><p>最后，我们工程师的智慧结晶都尽在代码之中，而 Code Review 可以促进结晶更加清莹通透、纯洁无瑕、精致完美，值得大家一起持续精进！</p></div></div></main><footer class="VPDocFooter" data-v-53ed897c data-v-f3af8004><!--[--><!--[--><!--[--><!--[--><!----><!--]--><!--]--><!--]--><!--]--><div class="edit-info" data-v-f3af8004><div class="edit-link" data-v-f3af8004><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/Charles7c/charles7c.github.io/edit/main/docs/categories/fragments/2023/01/06/CodeReview方法论与实践总结.md" target="_blank" rel="noreferrer" data-v-f3af8004><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-f3af8004><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> 不妥之处，敬请雅正<!--]--></a></div><div class="last-updated" data-v-f3af8004><p class="VPLastUpdated" data-v-f3af8004 data-v-a25eb6f3>最后更新: <time datetime="2023-01-06T13:01:12.000Z" data-v-a25eb6f3></time></p></div></div><nav class="prev-next" data-v-f3af8004><div class="pager" data-v-f3af8004><a class="VPLink link pager-link prev" href="/categories/fragments/2023/12/21/%E4%B8%80%E6%96%87%E8%AF%A6%E8%A7%A3%E9%99%90%E6%B5%81%E6%8E%A5%E5%8F%A3%E5%AE%9E%E7%8E%B0" data-v-f3af8004><!--[--><span class="desc" data-v-f3af8004>上一篇</span><span class="title" data-v-f3af8004><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>一文详解限流接口实现</span><!--]--></a></div><div class="pager" data-v-f3af8004><a class="VPLink link pager-link next" href="/categories/fragments/2022/12/07/%E7%BD%91%E7%AB%99%E5%BC%80%E5%90%AF%E7%81%B0%E8%89%B2%E6%98%BE%E7%A4%BA" data-v-f3af8004><!--[--><span class="desc" data-v-f3af8004>下一篇</span><span class="title" data-v-f3af8004><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>简单聊聊如何让网站开启灰色显示</span><!--]--></a></div></nav></footer><!--[--><!--[--><!--[--><div id="comment-container"></div><!--]--><!--]--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/tiger.svg\\\" title=\\\"虎年\\\" alt=\\\"生肖\\\">\\n 2022年 (12篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>解决 Maven 传递依赖污染的问题\",\"link\":\"/categories/issues/2022/11/23/解决Maven传递依赖污染的问题\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>解决 DotNet 安装完，报错：Couldn't find a valid ICU package installed on the system. 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display: inline-block;\\\">1</div>个人常用快捷键\",\"link\":\"/categories/fragments/2022/10/06/个人常用快捷键\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>个人常用 Git 命令\",\"link\":\"/categories/fragments/2022/10/05/个人常用Git命令\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>个人常用 Docker 命令\",\"link\":\"/categories/fragments/2022/10/01/个人常用Docker命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>个人常用 SQL 函数\",\"link\":\"/categories/fragments/2022/02/16/个人常用SQL函数\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>个人常用 Linux 命令\",\"link\":\"/categories/fragments/2019/12/31/个人常用Linux命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>个人常用 Hutool 工具类\",\"link\":\"/categories/fragments/2019/12/30/个人常用Hutool工具类\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>个人常用 Stream 使用技巧\",\"link\":\"/categories/fragments/2019/12/29/个人常用Stream使用技巧\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>个人 SQL 优化技巧\",\"link\":\"/categories/fragments/2019/12/28/个人SQL优化技巧\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/rabbit.svg\\\" title=\\\"兔年\\\" alt=\\\"生肖\\\">\\n 2023年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>一文详解限流接口实现\",\"link\":\"/categories/fragments/2023/12/21/一文详解限流接口实现\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>阿里巴巴的Code Review方法论与实践总结\",\"link\":\"/categories/fragments/2023/01/06/CodeReview方法论与实践总结\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/tiger.svg\\\" title=\\\"虎年\\\" alt=\\\"生肖\\\">\\n 2022年 (15篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>简单聊聊如何让网站开启灰色显示\",\"link\":\"/categories/fragments/2022/12/07/网站开启灰色显示\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>使用 IntelliJ IDEA 进行远程程序调试\",\"link\":\"/categories/fragments/2022/11/01/使用IDEA进行远程程序调试\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>CentOS 安装 Docker、Docker Compose\",\"link\":\"/categories/fragments/2022/10/31/CentOS安装Docker\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>Docker 安装 MinIO 详细步骤\",\"link\":\"/categories/fragments/2022/10/28/Docker安装MinIO\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>Docker 安装 Consul 详细步骤\",\"link\":\"/categories/fragments/2022/10/27/Docker安装Consul\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>Docker 安装 OpenLDAP 详细步骤\",\"link\":\"/categories/fragments/2022/10/26/Docker安装OpenLDAP\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>个人常用快捷键\",\"link\":\"/categories/fragments/2022/10/06/个人常用快捷键\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>个人常用 Git 命令\",\"link\":\"/categories/fragments/2022/10/05/个人常用Git命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">9</div>个人常用 Docker 命令\",\"link\":\"/categories/fragments/2022/10/01/个人常用Docker命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">10</div>内网CentOS服务器设置网络代理\",\"link\":\"/categories/fragments/2022/08/29/内网CentOS服务器设置网络代理\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">11</div>为指定Git仓库单独配置用户名和邮箱\",\"link\":\"/categories/fragments/2022/03/28/为指定Git仓库单独配置用户名和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">12</div>修改Git所有提交记录中的作者和邮箱\",\"link\":\"/categories/fragments/2022/03/27/修改Git所有提交记录中的作者和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">13</div>修改Git最后一次提交记录的作者和邮箱\",\"link\":\"/categories/fragments/2022/03/26/修改Git最后一次提交记录的作者和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">14</div>合并两个Git仓库的历史提交记录\",\"link\":\"/categories/fragments/2022/03/25/合并两个Git仓库的历史提交记录\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">15</div>个人常用 SQL 函数\",\"link\":\"/categories/fragments/2022/02/16/个人常用SQL函数\"}],\"collapsed\":true},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>设计模式之单例模式\",\"link\":\"/categories/fragments/2021/05/29/设计模式之单例模式\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>精密计算工具类-BigDecimal\",\"link\":\"/categories/fragments/2021/03/12/精密计算工具类-BigDecimal\"}],\"collapsed\":true},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/pig.svg\\\" title=\\\"猪年\\\" alt=\\\"生肖\\\">\\n 2019年 (4篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>个人常用 Linux 命令\",\"link\":\"/categories/fragments/2019/12/31/个人常用Linux命令\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>个人常用 Hutool 工具类\",\"link\":\"/categories/fragments/2019/12/30/个人常用Hutool工具类\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>个人常用 Stream 使用技巧\",\"link\":\"/categories/fragments/2019/12/29/个人常用Stream使用技巧\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>个人 SQL 优化技巧\",\"link\":\"/categories/fragments/2019/12/28/个人SQL优化技巧\"}],\"collapsed\":true}],\"/categories/solutions/\":[{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/tiger.svg\\\" title=\\\"虎年\\\" alt=\\\"生肖\\\">\\n 2022年 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>递归查询树型结构数据的性能优化方案\",\"link\":\"/categories/solutions/2022/09/07/递归查询树型结构数据的性能优化方案\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>一条SQL查询今年每月统计信息\",\"link\":\"/categories/solutions/2021/11/22/一条SQL查询今年每月统计信息\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>用Java8获取近N天日期\",\"link\":\"/categories/solutions/2021/11/18/用Java8获取近N天日期\"}],\"collapsed\":true}],\"/categories/tools/\":[{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (5篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>Quartz 快速入门\",\"link\":\"/categories/tools/2021/03/10/Quartz快速入门\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>Postman 快速入门\",\"link\":\"/categories/tools/2021/03/06/Postman快速入门\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>Another Redis Desktop Manager 快速入门\",\"link\":\"/categories/tools/2021/03/04/ARDM快速入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>Redis Desktop Manager 快速入门\",\"link\":\"/categories/tools/2021/02/22/RDM快速入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>初识 Lombok\",\"link\":\"/categories/tools/2021/01/14/初识Lombok\"}],\"collapsed\":false}],\"/courses/java/\":[{\"text\":\"Java语法入门 (14篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>开发环境搭建\",\"link\":\"/courses/java/01-Java语法入门/01-开发环境搭建\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>第一个Java程序\",\"link\":\"/courses/java/01-Java语法入门/02-第一个Java程序\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>初识Eclipse\",\"link\":\"/courses/java/01-Java语法入门/03-初识Eclipse\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>程序和计算机的那点事儿\",\"link\":\"/courses/java/01-Java语法入门/04-程序和计算机的那点事儿\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>变量和常量\",\"link\":\"/courses/java/01-Java语法入门/05-变量和常量\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>常用的运算符\",\"link\":\"/courses/java/01-Java语法入门/06-常用的运算符\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>控制语句和流程图\",\"link\":\"/courses/java/01-Java语法入门/07-控制语句和流程图\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>if选择结构\",\"link\":\"/courses/java/01-Java语法入门/08-if选择结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">9</div>switch选择结构\",\"link\":\"/courses/java/01-Java语法入门/09-switch选择结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">10</div>循环结构\",\"link\":\"/courses/java/01-Java语法入门/10-循环结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">11</div>多重循环\",\"link\":\"/courses/java/01-Java语法入门/11-多重循环\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">12</div>程序调试入门\",\"link\":\"/courses/java/01-Java语法入门/12-程序调试入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">13</div>一维数组\",\"link\":\"/courses/java/01-Java语法入门/13-一维数组\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">14</div>多维数组\",\"link\":\"/courses/java/01-Java语法入门/14-多维数组\"}],\"collapsed\":false},{\"text\":\"Java面向对象 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>类和对象\",\"link\":\"/courses/java/02-Java面向对象/01-类和对象\"}],\"collapsed\":true},{\"text\":\"Java高级特性 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>集合与泛型-1\",\"link\":\"/courses/java/03-Java高级特性/01-集合与泛型-1\"}],\"collapsed\":true},{\"text\":\"附录 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>CentOS 8.2 安装 JDK 1.8.0_202\",\"link\":\"/courses/java/04-附录/01-CentOS安装JDK\"}],\"collapsed\":true}],\"/courses/mysql/\":[{\"text\":\"MySQL基础 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>MySQL安装与配置\",\"link\":\"/courses/mysql/01-MySQL基础/01-MySQL安装与配置\"}],\"collapsed\":true},{\"text\":\"附录 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>CentOS 8.2 安装 MySQL 5.7.39\",\"link\":\"/courses/mysql/03-附录/01-CentOS安装MySQL\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>Docker 安装 MySQL 详细步骤\",\"link\":\"/courses/mysql/03-附录/02-Docker安装MySQL\"}],\"collapsed\":false}],\"/courses/mybatis/\":[{\"text\":\"MyBatis基础 (8篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>快速入门\",\"link\":\"/courses/mybatis/01-MyBatis基础/01-快速入门\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>核心对象\",\"link\":\"/courses/mybatis/01-MyBatis基础/02-核心对象\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>核心配置文件\",\"link\":\"/courses/mybatis/01-MyBatis基础/03-核心配置文件\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>SQL映射文件之查询元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/04-SQL映射文件之查询元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>SQL映射文件之增删改元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/05-SQL映射文件之增删改元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>SQL映射文件之自定义映射元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/06-SQL映射文件之自定义映射元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>SQL映射文件之缓存元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/07-SQL映射文件之缓存元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>动态SQL\",\"link\":\"/courses/mybatis/01-MyBatis基础/08-动态SQL\"}],\"collapsed\":false},{\"text\":\"MyBatis-Plus基础 (5篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; 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