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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 has-active" 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_2019_12_28_%E4%B8%AA%E4%BA%BASQL%E4%BC%98%E5%8C%96%E6%8A%80%E5%B7%A7" data-v-53ed897c><div><h1 id="个人-sql-优化技巧" tabindex="-1">个人 SQL 优化技巧 <span class="VPBadge warning" data-v-b2451d00><!--[-->持续更新<!--]--></span> <a class="header-anchor" href="#个人-sql-优化技巧" aria-label="Permalink to "个人 SQL 优化技巧 <Badge text="持续更新" type="warning" />""></a></h1><!----><h2 id="查询优化" tabindex="-1">查询优化 <a class="header-anchor" href="#查询优化" aria-label="Permalink to "查询优化""></a></h2><h3 id="如果确定结果只有一条-使用-limit-1" tabindex="-1">如果确定结果只有一条，使用 LIMIT 1 <span class="VPBadge tip" data-v-b2451d00><!--[-->建议<!--]--></span> <a class="header-anchor" href="#如果确定结果只有一条-使用-limit-1" aria-label="Permalink to "如果确定结果只有一条，使用 LIMIT 1 <Badge text="建议" />""></a></h3><p>我们在根据一个或多个条件查询数据时，如果确定查询结果只有一条，可以在结尾处添加 LIMIT 1 进行限制。</p><p>这样既可以让 EXPLAIN 中的 type 达到 const 类型，又可以免去担忧在程序中出现接收是单个对象却返回了一个集合对象的异常问题。</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-aKjwj" id="tab-4RgYM6a" checked="checked"><label for="tab-4RgYM6a">正例</label><input type="radio" name="group-aKjwj" id="tab-OP0cCXz"><label for="tab-OP0cCXz">反例</label></div><div class="blocks"><div class="language-sql vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sql</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;"># email 不是主键，也没有设置唯一约束，根据熵增定律，查询结果是有可能会出现多条的</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">SELECT</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> *</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> FROM</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `sys_user`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> WHERE</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `email`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> 'charles7c@126.com'</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> LIMIT</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span></code></pre></div><div class="language-sql vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sql</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;"># user_id 是主键，主键是非空唯一的，那么不需要添加 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">LIMIT</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> 进行限制</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">SELECT</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> *</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> FROM</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `sys_user`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> WHERE</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `user_id`</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></code></pre></div></div></div><h3 id="避免隐式类型转换" tabindex="-1">避免隐式类型转换 <span class="VPBadge danger" data-v-b2451d00><!--[-->强制<!--]--></span> <a class="header-anchor" href="#避免隐式类型转换" aria-label="Permalink to "避免隐式类型转换 <Badge text="强制" type="danger" />""></a></h3><p>我们在使用 MySQL 时，或多或少都感受过 MySQL 的隐式类型转换。例如：user_id 是整数类型，但是依然可以使用字符串类型数据来进行判断。MySQL 帮你做完这种隐式类型转换是有代价的，什么代价呢？ <strong>索引不再生效了而已</strong> 。</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-w3Vw7" id="tab-pLBOwNN" checked="checked"><label for="tab-pLBOwNN">正例</label><input type="radio" name="group-w3Vw7" id="tab-Es4K2fc"><label for="tab-Es4K2fc">反例</label></div><div class="blocks"><div class="language-sql vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sql</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;">SELECT</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> *</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> FROM</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `sys_user`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> WHERE</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `user_id`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 10</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span></code></pre></div><div class="language-sql vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sql</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;">SELECT</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> *</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> FROM</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `sys_user`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> WHERE</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `user_id`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> '10'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span></code></pre></div></div></div><h2 id="数据库表设计" tabindex="-1">数据库表设计 <a class="header-anchor" href="#数据库表设计" aria-label="Permalink to "数据库表设计""></a></h2><h3 id="列名带上前缀" tabindex="-1">列名带上前缀 <span class="VPBadge tip" data-v-b2451d00><!--[-->建议<!--]--></span> <a class="header-anchor" href="#列名带上前缀" aria-label="Permalink to "列名带上前缀 <Badge text="建议" />""></a></h3><p>部分列名带上前缀或缩写，可以有效减少在连接查询、ORM 映射等场景下刻意起别名或思考区分不同的问题。</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-GlF3Y" id="tab-hM_ufxR" checked="checked"><label for="tab-hM_ufxR">正例</label></div><div class="blocks"><div class="language-sql vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sql</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;">CREATE</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> TABLE</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> `</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">sys_customer</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">` (</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `customer_id`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> bigint</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">20</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) UNSIGNED </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">NOT NULL</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> AUTO_INCREMENT COMMENT </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'客户ID'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">,</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `customer_name`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> varchar</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">255</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">NOT NULL</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> COMMENT </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'客户名称'</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;"> PRIMARY KEY</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`customer_id`</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">USING</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BTREE,</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) COMMENT </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> '客户表'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">CREATE</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> TABLE</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> `</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">sys_contact_user</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">` (</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `contact_user_id`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> bigint</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">20</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) UNSIGNED </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">NOT NULL</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> AUTO_INCREMENT COMMENT </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'联系人ID'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">,</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `contact_user_name`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> varchar</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">255</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">NOT NULL</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> COMMENT </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'联系人名称'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">,</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `customer_id`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> bigint</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">20</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) UNSIGNED </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">NOT NULL</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> COMMENT </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'客户ID'</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;"> PRIMARY KEY</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`contact_user_id`</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">USING</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BTREE,</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) COMMENT </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> '联系人表'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"># 连接查询，你完全不需要用脑去考虑到底是 c.</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`id`</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> 还是 cu.</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`customer_id`</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> 的问题，都是 </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`customer_id`</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">SELECT</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> *</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> FROM</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `sys_customer`</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> c </span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">LEFT JOIN</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> `sys_contact_user`</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> cu </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">ON</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> c.</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`customer_id`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> cu.</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`customer_id`</span></span></code></pre></div></div></div><h3 id="非负数列添加unsigned无符号约束" tabindex="-1">非负数列添加UNSIGNED无符号约束 <span class="VPBadge tip" data-v-b2451d00><!--[-->建议<!--]--></span> <a class="header-anchor" href="#非负数列添加unsigned无符号约束" aria-label="Permalink to "非负数列添加UNSIGNED无符号约束 <Badge text="建议" />""></a></h3><p>在大部分的数据存储场景中，我们只会使用正整数，如果能确定该列为非负数，建议添加 <code>UNSIGNED</code> 无符号约束。</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Wb81B" id="tab-l6d7MjX" checked="checked"><label for="tab-l6d7MjX">正例</label></div><div class="blocks"><div class="language-sql vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sql</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;"># 不添加 UNSIGNED 约束，取值范围</span></span>
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||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">TINYINT</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">：[-128, 127]</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"># 添加 UNSIGNED 约束，取值范围</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">TINYINT</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">：[0, 255]</span></span></code></pre></div></div></div><h3 id="合理采用整数类型" tabindex="-1">合理采用整数类型 <span class="VPBadge tip" data-v-b2451d00><!--[-->建议<!--]--></span> <a class="header-anchor" href="#合理采用整数类型" aria-label="Permalink to "合理采用整数类型 <Badge text="建议" />""></a></h3><p>例如：状态类的信息，状态再多能有多少个，采用 <code>TINYINT</code> 即可，减少存储空间占用。</p><p>下方表数据整理于：<a href="https://dev.mysql.com/doc/refman/5.7/en/integer-types.html" target="_blank" rel="noreferrer">MySQL 5.7官方文档/数据类型/数值数据类型/整数类型</a></p><table><thead><tr><th style="text-align:left;">类型</th><th style="text-align:left;">存储（字节）</th><th style="text-align:left;">取值范围</th><th style="text-align:left;">取值范围（无符号）</th></tr></thead><tbody><tr><td style="text-align:left;">TINYINT</td><td style="text-align:left;">1</td><td style="text-align:left;">[-128, 127]</td><td style="text-align:left;">[0, 255]</td></tr><tr><td style="text-align:left;">SMALLINT</td><td style="text-align:left;">2</td><td style="text-align:left;">[-32768, 32767]</td><td style="text-align:left;">[0, 65535]</td></tr><tr><td style="text-align:left;">MEDIUMINT</td><td style="text-align:left;">3</td><td style="text-align:left;">[-8388608, 8388607]</td><td style="text-align:left;">[0, 16777215]</td></tr><tr><td style="text-align:left;">INT</td><td style="text-align:left;">4</td><td style="text-align:left;">[-2147483648, 2147483647]</td><td style="text-align:left;">[0, 4294967295]</td></tr><tr><td style="text-align:left;">BIGINT</td><td style="text-align:left;">8</td><td style="text-align:left;">[-2^63^, 2^63^-1]</td><td style="text-align:left;">[0, 2^64^-1]</td></tr></tbody></table><h3 id="布尔列采用bit类型" tabindex="-1">布尔列采用bit类型 <span class="VPBadge tip" data-v-b2451d00><!--[-->建议<!--]--></span> <a class="header-anchor" href="#布尔列采用bit类型" aria-label="Permalink to "布尔列采用bit类型 <Badge text="建议" />""></a></h3><p>例如：是否删除这种只有两种状态的信息，在表设计时建议对该列设置 <code>bit</code> 类型（0表示否/假/false，1表示是/真/true），在程序语言中可以采用 boolean 类型对应。</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-lf9nn" id="tab-BLMNMSH" checked="checked"><label for="tab-BLMNMSH">SQL</label><input type="radio" name="group-lf9nn" id="tab-UtntfC1"><label for="tab-UtntfC1">Java</label></div><div class="blocks"><div class="language-sql vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sql</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">`is_deleted`</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> bit</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">NOT NULL</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> DEFAULT</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> b</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'0'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> COMMENT </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'是否已删除（0否 1是）'</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>
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||
<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;"> User</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /**</span></span>
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||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 是否已删除（0否 1是）</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
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||
<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:#24292E;--shiki-dark:#ADBAC7;"> isDeleted;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div></div></div><h2 id="数据库设计" tabindex="-1">数据库设计 <a class="header-anchor" href="#数据库设计" aria-label="Permalink to "数据库设计""></a></h2><h3 id="采用utf8mb4编码" tabindex="-1">采用utf8mb4编码 <span class="VPBadge tip" data-v-b2451d00><!--[-->建议<!--]--></span> <a class="header-anchor" href="#采用utf8mb4编码" aria-label="Permalink to "采用utf8mb4编码 <Badge text="建议" />""></a></h3><div class="tip custom-block"><p class="custom-block-title">如果要存储特殊字符（例如：emoij表情符），使用 utf8mb4 编码。</p><p>MySQL 5.5.3 后增加了一个新的编码： <code>utf8mb4</code> ，其中 mb4 是 most bytes 4 的意思，用于兼容四字节的 unicode。</p><p><code>utf8mb4</code> 是 utf8 的超集，除了将编码改为 <code>utf8mb4</code> 外不需要做其他转换。</p><p>设计数据库时如果想要允许用户使用特殊符号，最好使用 <code>utf8mb4</code> 编码来存储，使得数据库有更好的兼容性，但是这样设计会导致耗费更多的存储空间。</p></div></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/2019/12/28/个人SQL优化技巧.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="2022-12-19T04:24:35.000Z" 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/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-f3af8004><!--[--><span class="desc" data-v-f3af8004>上一篇</span><span class="title" data-v-f3af8004><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</span><!--]--></a></div><div class="pager" data-v-f3af8004><a class="VPLink link pager-link next" 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>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>一文详解限流接口实现</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. Please install libicu using your package manager and try again\",\"link\":\"/categories/issues/2022/11/06/解决DotNET安装后报错的问题\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>解决 Docker 安装 Prometheus 启动报 permission denied 的问题\",\"link\":\"/categories/issues/2022/11/04/解决Docker安装Prometheus启动报错的问题\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>Docker 设置网络代理\",\"link\":\"/categories/issues/2022/10/29/Docker设置网络代理\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>解决 CentOS 8 执行 yum install 报 Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist 的问题\",\"link\":\"/categories/issues/2022/10/25/解决CentOS8执行yum安装报错\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>解决 Windows 桌面部分快捷方式图标变为空白的问题\",\"link\":\"/categories/issues/2022/10/15/解决Windows桌面部分快捷方式图标变为空白的问题\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>解决无法重复读取请求体和响应体的问题\",\"link\":\"/categories/issues/2022/09/23/解决无法重复读取请求体和响应体的问题\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>Nginx转发请求，报13：Permission denied错误\",\"link\":\"/categories/issues/2022/09/05/Nginx转发请求，报13：Permission denied错误\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">9</div>SpringBoot项目引入OpenFeign后无法启动\",\"link\":\"/categories/issues/2022/08/31/SpringBoot项目引入OpenFeign后无法启动\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">10</div>执行Shell脚本，报java: command not found\",\"link\":\"/categories/issues/2022/08/11/执行Shell脚本，报java command not found\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">11</div>创建一个自身类的静态对象变量，究竟会如何执行？\",\"link\":\"/categories/issues/2022/03/24/创建一个自身类的静态对象变量，究竟会如何执行？\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">12</div>JavaScript 无法存储 Java Long 类型数据问题\",\"link\":\"/categories/issues/2022/01/26/JavaScript 无法存储 Java Long 类型数据问题\"}],\"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 (5篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>无法访问 F:\\\\。文件或目录损坏且无法读取。\",\"link\":\"/categories/issues/2021/12/13/无法访问F盘。文件或目录损坏且无法读取\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>SQL 注入攻击风险\",\"link\":\"/categories/issues/2021/12/11/SQL 注入攻击风险\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>Command line is too long. Shorten command line for XXX or also for Spring Boot default configuration？\",\"link\":\"/categories/issues/2021/12/10/Command line is too long. Shorten command line for XXX or also for Spring Boot default configuration\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>for循环中删除集合元素隐藏的陷阱\",\"link\":\"/categories/issues/2021/12/08/for循环中删除集合元素隐藏的陷阱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>F:\\\\ 上的回收站已损坏。是否清空该驱动器上的\\\"回收站\\\"?\",\"link\":\"/categories/issues/2021/12/01/F盘上的回收站已损坏。是否清空该驱动器上的回收站\"}],\"collapsed\":true}],\"/categories/fragments/\":[{\"text\":\"<svg style=\\\"display: inline-block; vertical-align: middle; padding-bottom: 3px;\\\" viewBox=\\\"0 0 1920 1024\\\" version=\\\"1.1\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\" width=\\\"30\\\" height=\\\"30\\\"><path d=\\\"M367.488 667.904h423.744v47.232H367.488v-47.232zM320.256 204.352h137.28v68.992h-137.28v-68.992zM367.488 754.112h423.744v48H367.488v-48zM693.76 204.352h137.984v68.992H693.76v-68.992zM507.008 204.352h137.28v68.992h-137.28v-68.992z\\\" p-id=\\\"10749\\\" fill=\\\"#d81e06\\\"></path><path d=\\\"M1792.512 0H127.488C57.472 0 0 57.152 0 127.616v768.768C0 966.72 57.088 1024 127.488 1024h1665.088c69.952 0 127.424-57.152 127.424-127.616V127.616C1920 57.216 1862.912 0 1792.512 0z m-528 175.104h446.976v54.016H1494.72l-24 101.248h206.976V689.6h-57.728V384.32h-289.472v308.224h-57.728v-362.24h140.224l20.992-101.248h-169.472v-53.952z m-996.032-11.2h614.272v167.232h-51.008v-17.28H320.256v17.28H268.48V163.904z m678.784 681.728h-744v-43.52h111.744V454.848h229.504v-48.704H221.248v-42.048h323.264v-39.744h54.016v39.744h331.52v41.984h-331.52v48.768h245.248v347.264h103.488v43.52z m203.264-94.528c0 59.52-30.72 89.28-92.224 89.28-25.472 0-46.016-0.512-61.504-1.472-2.496-22.976-6.528-45.248-12.032-66.752 22.976 5.504 46.72 8.256 71.232 8.256 24 0 35.968-11.52 35.968-34.496V247.872H971.2v-54.72h278.976v54.72H1150.4v503.232z m521.216 121.536c-67.008-55.488-137.28-108.032-210.752-157.504-4.992 9.984-10.496 19.008-16.512 27.008-41.472 57.024-113.28 101.504-215.232 133.504-9.472-16.512-21.504-34.496-35.968-54.016 94.528-27.008 161.28-64.512 200.256-112.512 34.496-44.992 51.776-113.024 51.776-204.032V421.12h57.728v82.496c0 62.528-6.72 115.776-20.224 159.744 84.48 54.016 161.472 107.008 230.976 158.976l-42.048 50.304z\\\" p-id=\\\"10750\\\" fill=\\\"#d81e06\\\"></path><path d=\\\"M367.488 495.36h423.744v47.232H367.488V495.36zM367.488 581.632h423.744v47.232H367.488v-47.232z\\\" p-id=\\\"10751\\\" fill=\\\"#d81e06\\\"></path></svg>\\n 我的置顶 (8篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; 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; 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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; 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