mirror of
https://github.com/jaywcjlove/reference.git
synced 2025-06-19 05:31:21 +08:00
833 lines
149 KiB
HTML
833 lines
149 KiB
HTML
<!doctype html>
|
||
<html lang="en" data-color-mode="dark">
|
||
<head>
|
||
<meta charset="utf-8">
|
||
<title>Neo4j 备忘清单
|
||
& neo4j cheatsheet & Quick Reference</title>
|
||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||
<meta description="Neo4这个 neo4j 快速参考备忘单显示了它的常用命令
|
||
|
||
入门，为开发人员分享快速参考备忘单。">
|
||
<meta keywords="neo4j,reference,Quick,Reference,cheatsheet,cheat,sheet">
|
||
<link rel="icon" href="data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%2024%2024%22%20fill%3D%22none%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20height%3D%221em%22%20width%3D%221em%22%3E%20%3Cpath%20d%3D%22m21.66%2010.44-.98%204.18c-.84%203.61-2.5%205.07-5.62%204.77-.5-.04-1.04-.13-1.62-.27l-1.68-.4c-4.17-.99-5.46-3.05-4.48-7.23l.98-4.19c.2-.85.44-1.59.74-2.2%201.17-2.42%203.16-3.07%206.5-2.28l1.67.39c4.19.98%205.47%203.05%204.49%207.23Z%22%20fill%3D%22%23c9d1d9%22%2F%3E%20%3Cpath%20d%3D%22M15.06%2019.39c-.62.42-1.4.77-2.35%201.08l-1.58.52c-3.97%201.28-6.06.21-7.35-3.76L2.5%2013.28c-1.28-3.97-.22-6.07%203.75-7.35l1.58-.52c.41-.13.8-.24%201.17-.31-.3.61-.54%201.35-.74%202.2l-.98%204.19c-.98%204.18.31%206.24%204.48%207.23l1.68.4c.58.14%201.12.23%201.62.27Zm2.43-8.88c-.06%200-.12-.01-.19-.02l-4.85-1.23a.75.75%200%200%201%20.37-1.45l4.85%201.23a.748.748%200%200%201-.18%201.47Z%22%20fill%3D%22%23228e6c%22%20%2F%3E%20%3Cpath%20d%3D%22M14.56%2013.89c-.06%200-.12-.01-.19-.02l-2.91-.74a.75.75%200%200%201%20.37-1.45l2.91.74c.4.1.64.51.54.91-.08.34-.38.56-.72.56Z%22%20fill%3D%22%23228e6c%22%20%2F%3E%20%3C%2Fsvg%3E" type="image/svg+xml">
|
||
<link rel="stylesheet" href="../style/style.css">
|
||
<link rel="stylesheet" href="../style/katex.css">
|
||
</head>
|
||
<body><nav class="header-nav"><div class="max-container"><a href="../index.html" class="logo"><svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" height="1em" width="1em">
|
||
<path d="m21.66 10.44-.98 4.18c-.84 3.61-2.5 5.07-5.62 4.77-.5-.04-1.04-.13-1.62-.27l-1.68-.4c-4.17-.99-5.46-3.05-4.48-7.23l.98-4.19c.2-.85.44-1.59.74-2.2 1.17-2.42 3.16-3.07 6.5-2.28l1.67.39c4.19.98 5.47 3.05 4.49 7.23Z" fill="#c9d1d9"></path>
|
||
<path d="M15.06 19.39c-.62.42-1.4.77-2.35 1.08l-1.58.52c-3.97 1.28-6.06.21-7.35-3.76L2.5 13.28c-1.28-3.97-.22-6.07 3.75-7.35l1.58-.52c.41-.13.8-.24 1.17-.31-.3.61-.54 1.35-.74 2.2l-.98 4.19c-.98 4.18.31 6.24 4.48 7.23l1.68.4c.58.14 1.12.23 1.62.27Zm2.43-8.88c-.06 0-.12-.01-.19-.02l-4.85-1.23a.75.75 0 0 1 .37-1.45l4.85 1.23a.748.748 0 0 1-.18 1.47Z" fill="#228e6c"></path>
|
||
<path d="M14.56 13.89c-.06 0-.12-.01-.19-.02l-2.91-.74a.75.75 0 0 1 .37-1.45l2.91.74c.4.1.64.51.54.91-.08.34-.38.56-.72.56Z" fill="#228e6c"></path>
|
||
</svg>
|
||
<span class="title">Quick Reference</span></a><div class="menu"><a href="javascript:void(0);" class="searchbtn" id="searchbtn"><svg xmlns="http://www.w3.org/2000/svg" height="1em" width="1em" viewBox="0 0 18 18">
|
||
<path fill="currentColor" d="M17.71,16.29 L14.31,12.9 C15.4069846,11.5024547 16.0022094,9.77665502 16,8 C16,3.581722 12.418278,0 8,0 C3.581722,0 0,3.581722 0,8 C0,12.418278 3.581722,16 8,16 C9.77665502,16.0022094 11.5024547,15.4069846 12.9,14.31 L16.29,17.71 C16.4777666,17.8993127 16.7333625,18.0057983 17,18.0057983 C17.2666375,18.0057983 17.5222334,17.8993127 17.71,17.71 C17.8993127,17.5222334 18.0057983,17.2666375 18.0057983,17 C18.0057983,16.7333625 17.8993127,16.4777666 17.71,16.29 Z M2,8 C2,4.6862915 4.6862915,2 8,2 C11.3137085,2 14,4.6862915 14,8 C14,11.3137085 11.3137085,14 8,14 C4.6862915,14 2,11.3137085 2,8 Z"></path>
|
||
</svg><span>搜索</span><span>⌘K</span></a><a href="https://github.com/jaywcjlove/reference/blob/main/docs/neo4j.md" class="" target="__blank"><svg viewBox="0 0 36 36" fill="currentColor" height="1em" width="1em"><path d="m33 6.4-3.7-3.7a1.71 1.71 0 0 0-2.36 0L23.65 6H6a2 2 0 0 0-2 2v22a2 2 0 0 0 2 2h22a2 2 0 0 0 2-2V11.76l3-3a1.67 1.67 0 0 0 0-2.36ZM18.83 20.13l-4.19.93 1-4.15 9.55-9.57 3.23 3.23ZM29.5 9.43 26.27 6.2l1.85-1.85 3.23 3.23Z"></path><path fill="none" d="M0 0h36v36H0z"></path></svg><span>编辑</span></a><button id="darkMode" type="button"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="light" height="1em" width="1em">
|
||
<path d="M6.995 12c0 2.761 2.246 5.007 5.007 5.007s5.007-2.246 5.007-5.007-2.246-5.007-5.007-5.007S6.995 9.239 6.995 12zM11 19h2v3h-2zm0-17h2v3h-2zm-9 9h3v2H2zm17 0h3v2h-3zM5.637 19.778l-1.414-1.414 2.121-2.121 1.414 1.414zM16.242 6.344l2.122-2.122 1.414 1.414-2.122 2.122zM6.344 7.759 4.223 5.637l1.415-1.414 2.12 2.122zm13.434 10.605-1.414 1.414-2.122-2.122 1.414-1.414z"></path>
|
||
</svg>
|
||
<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="dark" height="1em" width="1em">
|
||
<path d="M12 11.807A9.002 9.002 0 0 1 10.049 2a9.942 9.942 0 0 0-5.12 2.735c-3.905 3.905-3.905 10.237 0 14.142 3.906 3.906 10.237 3.905 14.143 0a9.946 9.946 0 0 0 2.735-5.119A9.003 9.003 0 0 1 12 11.807z"></path>
|
||
</svg>
|
||
</button><script src="../js/dark.js?v=1.5.3"></script><a href="https://github.com/jaywcjlove/reference" class="" target="__blank"><svg viewBox="0 0 16 16" fill="currentColor" height="1em" width="1em"><path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.012 8.012 0 0 0 16 8c0-4.42-3.58-8-8-8z"></path></svg></a></div></div></nav><div class="wrap h1body-exist max-container"><header class="wrap-header h1wrap"><h1 id="neo4j-备忘清单"><svg xmlns="http://www.w3.org/2000/svg" height="1em" width="1em" fill="#4581C3" role="img" viewBox="0 0 24 24"><title>Neo4j</title><path d="M9.629 13.227c-.593 0-1.139.2-1.58.533l-2.892-1.976a2.61 2.61 0 0 0 .101-.711 2.633 2.633 0 0 0-2.629-2.629A2.632 2.632 0 0 0 0 11.073a2.632 2.632 0 0 0 2.629 2.629c.593 0 1.139-.2 1.579-.533L7.1 15.145c-.063.226-.1.465-.1.711 0 .247.037.484.1.711l-2.892 1.976a2.608 2.608 0 0 0-1.579-.533A2.632 2.632 0 0 0 0 20.639a2.632 2.632 0 0 0 2.629 2.629 2.632 2.632 0 0 0 2.629-2.629c0-.247-.037-.485-.101-.711l2.892-1.976c.441.333.987.533 1.58.533a2.633 2.633 0 0 0 2.629-2.629c0-1.45-1.18-2.629-2.629-2.629ZM16.112.732c-4.72 0-7.888 2.748-7.888 8.082v3.802a3.525 3.525 0 0 1 3.071.008v-3.81c0-3.459 1.907-5.237 4.817-5.237s4.817 1.778 4.817 5.237v8.309H24V8.814C24 3.448 20.832.732 16.112.732Z"></path></svg><a aria-hidden="true" tabindex="-1" href="#neo4j-备忘清单"><span class="icon icon-link"></span></a>Neo4j 备忘清单</h1><div class="wrap-body">
|
||
<p>这个 <a href="https://neo4j.com/docs/">neo4j</a> 快速参考备忘单显示了它的常用命令</p>
|
||
</div></header><div class="menu-tocs"><div class="menu-btn"><svg aria-hidden="true" fill="currentColor" height="1em" width="1em" viewBox="0 0 16 16" version="1.1" data-view-component="true">
|
||
<path fill-rule="evenodd" d="M2 4a1 1 0 100-2 1 1 0 000 2zm3.75-1.5a.75.75 0 000 1.5h8.5a.75.75 0 000-1.5h-8.5zm0 5a.75.75 0 000 1.5h8.5a.75.75 0 000-1.5h-8.5zm0 5a.75.75 0 000 1.5h8.5a.75.75 0 000-1.5h-8.5zM3 8a1 1 0 11-2 0 1 1 0 012 0zm-1 6a1 1 0 100-2 1 1 0 000 2z"></path>
|
||
</svg></div><div class="menu-modal"><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#入门">入门</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#neo4j">Neo4J</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#运行">运行</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#neo4j-使用">Neo4J 使用</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#进入管理页面">进入管理页面</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#图数据库概念">图数据库概念</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#neo4j-语法">Neo4j 语法</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#读取查询结构">读取查询结构</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#仅写入查询结构">仅写入查询结构</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#读取-写入查询结构">读取-写入查询结构</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#neo4j-读取数据">Neo4j 读取数据</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#match">MATCH</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#where">WHERE</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#return">RETURN</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#with">WITH</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#union">UNION</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#neo4j-写入数据">Neo4j 写入数据</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#create">CREATE</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#set">SET</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#merge">MERGE</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#delete">DELETE</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#remove">REMOVE</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#foreach">FOREACH</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#调用子查询">调用子查询</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#调用存储过程">调用存储过程</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#导入">导入</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#运算符">运算符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#null">null</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#patterns">Patterns</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#use">USE</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#show-functions-和-procedures">SHOW FUNCTIONS 和 PROCEDURES</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#标签">标签</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#lists">Lists</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#maps">Maps</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#case">CASE</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#predicates-谓词">Predicates 谓词</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#列表谓词">列表谓词</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#列表表达式">列表表达式</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#函数">函数</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#路径函数">路径函数</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#空间函数">空间函数</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#neo4j-示例">Neo4j 示例</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#创建">创建</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#删除">删除</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#查询">查询</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#创建节点和关系">创建节点和关系</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#增加修改节点的属性">增加/修改节点的属性</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#查询节点和关系">查询节点和关系</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#更新节点和关系">更新节点和关系</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#更复杂的查询">更复杂的查询</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#排序分页">排序&分页</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#聚合函数">聚合函数</a></div></div><div class="h1wrap-body"><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="入门"><a aria-hidden="true" tabindex="-1" href="#入门"><span class="icon icon-link"></span></a>入门</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="neo4j"><a aria-hidden="true" tabindex="-1" href="#neo4j"><span class="icon icon-link"></span></a>Neo4J</h3><div class="wrap-body">
|
||
<p>Neo4j是一个图形数据库，由节点通过关系连接在一起。如果您有一个高度相互连接的数据集或者有很多连接的查询，您可能会考虑使用图数据库。</p>
|
||
<ul>
|
||
<li><a href="https://neo4j.com/download">下载 Neo4j Desktop</a> <em>下载 Neo4j 桌面版或服务器版</em></li>
|
||
<li><a href="https://sandbox.neo4j.com">Neo4j 沙盒</a> <em>选择一个数据集 - 无需安装</em></li>
|
||
<li><a href="https://neo4j.com/aura">Neo4j Aura</a> <em>在云端获得免费的 Neo4j 实例</em></li>
|
||
<li><a href="https://neo4j.com/graphacademy">Neo4j 图形学院</a> <em>免费、自主学习、实践性的在线培训</em></li>
|
||
<li><a href="https://neo4j.com/graphgists">GraphGists</a> <em>使用案例和行业特定的示例图</em></li>
|
||
</ul>
|
||
<h4 id="运行"><a aria-hidden="true" tabindex="-1" href="#运行"><span class="icon icon-link"></span></a>运行</h4>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line">$ bin/neo4j start
|
||
</span></code></pre>
|
||
<p>在 Mac 或者 Linux 中，安装好 JDK 后，直接解压下载好的 Neo4j 包，然后运行上面命令即可。</p>
|
||
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="neo4j-使用"><a aria-hidden="true" tabindex="-1" href="#neo4j-使用"><span class="icon icon-link"></span></a>Neo4J 使用</h3><div class="wrap-body">
|
||
<p>Neo4J 提供了一个用户友好的 web 界面，可以进行各项配置、写入、查询等操作，并且提供了可视化功能。类似ElasticSearch 一样，我个人非常喜欢这种开箱即用的设计。</p>
|
||
<h4 id="进入管理页面"><a aria-hidden="true" tabindex="-1" href="#进入管理页面"><span class="icon icon-link"></span></a>进入管理页面</h4>
|
||
<p>打开浏览器，输入下面网址，可以进入管理页面</p>
|
||
<pre class="language-url"><code class="language-url code-highlight"><span class="code-line"><span class="token scheme">http<span class="token scheme-delimiter">:</span></span><span class="token authority"><span class="token authority-delimiter">//</span><span class="token host"><span class="token ipv4-address">127.0.0.1</span></span><span class="token port-segment"><span class="token port-delimiter">:</span><span class="token port">7474</span></span></span><span class="token path"><span class="token path-separator">/</span>browser<span class="token path-separator">/</span></span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="图数据库概念"><a aria-hidden="true" tabindex="-1" href="#图数据库概念"><span class="icon icon-link"></span></a>图数据库概念</h3><div class="wrap-body">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<table class="style-list-arrow"><thead><tr><th></th><th></th></tr></thead><tbody><tr><td><code>节点</code></td><td>节点通常用于表示数据中的 <em>实体</em> 或 <em>事物</em>。例如，一个 <strong>Person（人）</strong> 或 <strong>Movie（电影）</strong>。</td></tr><tr><td><code>关系</code></td><td>关系用于将两个节点连接在一起，并将数据组织成结构。例如，一个人 <strong>acted in（出演）</strong> 一部电影。关系有一个 <em>类型</em> 和 <em>方向</em>，尽管在查询时可以忽略方向。</td></tr><tr><td><code>标签</code></td><td>标签用于将节点分组到不同的类别中。例如，一个人可以有 <code>Person(人)</code> 和 <code>Actor(演员)</code> 标签。</td></tr><tr><td><code>关系类型</code></td><td>每个关系都有一个类型。关系允许您在图中探索较小的部分。</td></tr><tr><td><code>属性</code></td><td>节点和关系都可以设置属性。属性是 <a href="https://neo4j.com/docs/cypher-manual/4.3/syntax/values/#cypher-values">名称-值对</a>。</td></tr></tbody></table>
|
||
<!--rehype:className=style-list-arrow-->
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="neo4j-语法"><a aria-hidden="true" tabindex="-1" href="#neo4j-语法"><span class="icon icon-link"></span></a>Neo4j 语法</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="读取查询结构"><a aria-hidden="true" tabindex="-1" href="#读取查询结构"><span class="icon icon-link"></span></a>读取查询结构</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span>USE<span class="token punctuation">]</span> <span class="token comment">// (使用)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">MATCH</span> <span class="token keyword">WHERE</span><span class="token punctuation">]</span> <span class="token comment">// (匹配条件)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">OPTIONAL</span> <span class="token keyword">MATCH</span> <span class="token keyword">WHERE</span><span class="token punctuation">]</span> <span class="token comment">// (可选匹配条件)</span>
|
||
</span><span class="code-line"><span class="token comment">// (传递结果并进行排序、跳过或限制)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">WITH</span> <span class="token punctuation">[</span><span class="token keyword">ORDER</span> <span class="token keyword">BY</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">SKIP</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">LIMIT</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line"><span class="token comment">// (返回结果并进行排序、跳过或限制)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token punctuation">[</span><span class="token keyword">ORDER</span> <span class="token keyword">BY</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">SKIP</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">LIMIT</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="仅写入查询结构"><a aria-hidden="true" tabindex="-1" href="#仅写入查询结构"><span class="icon icon-link"></span></a>仅写入查询结构</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span>USE<span class="token punctuation">]</span> <span class="token comment">// (使用)</span>
|
||
</span><span class="code-line"><span class="token punctuation">(</span><span class="token keyword">CREATE</span> <span class="token operator">|</span> <span class="token keyword">MERGE</span><span class="token punctuation">)</span><span class="token operator">*</span> <span class="token comment">// (创建或合并节点和关系)</span>
|
||
</span><span class="code-line"><span class="token comment">// (设置、删除、移除或循环操作)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">SET</span><span class="token operator">|</span><span class="token keyword">DELETE</span><span class="token operator">|</span><span class="token keyword">REMOVE</span><span class="token operator">|</span><span class="token keyword">FOREACH</span><span class="token punctuation">]</span><span class="token operator">*</span>
|
||
</span><span class="code-line"><span class="token comment">// (返回结果并进行排序、跳过或限制)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">RETURN</span> <span class="token punctuation">[</span><span class="token keyword">ORDER</span> <span class="token keyword">BY</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">SKIP</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">LIMIT</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="读取-写入查询结构"><a aria-hidden="true" tabindex="-1" href="#读取-写入查询结构"><span class="icon icon-link"></span></a>读取-写入查询结构</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span>USE<span class="token punctuation">]</span> <span class="token comment">// (使用)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">MATCH</span> <span class="token keyword">WHERE</span><span class="token punctuation">]</span> <span class="token comment">// (匹配条件)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">OPTIONAL</span> <span class="token keyword">MATCH</span> <span class="token keyword">WHERE</span><span class="token punctuation">]</span> <span class="token comment">// (可选匹配条件)</span>
|
||
</span><span class="code-line"><span class="token comment">// (传递结果并进行排序、跳过或限制)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">WITH</span> <span class="token punctuation">[</span><span class="token keyword">ORDER</span> <span class="token keyword">BY</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">SKIP</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">LIMIT</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line"><span class="token punctuation">(</span><span class="token keyword">CREATE</span> <span class="token operator">|</span> <span class="token keyword">MERGE</span><span class="token punctuation">)</span><span class="token operator">*</span> <span class="token comment">// (创建或合并节点和关系)</span>
|
||
</span><span class="code-line"><span class="token comment">// (设置、删除、移除或循环操作)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">SET</span><span class="token operator">|</span><span class="token keyword">DELETE</span><span class="token operator">|</span><span class="token keyword">REMOVE</span><span class="token operator">|</span><span class="token keyword">FOREACH</span><span class="token punctuation">]</span><span class="token operator">*</span>
|
||
</span><span class="code-line"><span class="token comment">// (返回结果并进行排序、跳过或限制)</span>
|
||
</span><span class="code-line"><span class="token punctuation">[</span><span class="token keyword">RETURN</span> <span class="token punctuation">[</span><span class="token keyword">ORDER</span> <span class="token keyword">BY</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">SKIP</span><span class="token punctuation">]</span> <span class="token punctuation">[</span><span class="token keyword">LIMIT</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="neo4j-读取数据"><a aria-hidden="true" tabindex="-1" href="#neo4j-读取数据"><span class="icon icon-link"></span></a>Neo4j 读取数据</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="match"><a aria-hidden="true" tabindex="-1" href="#match"><span class="icon icon-link"></span></a>MATCH</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> n<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">'Alice'</span>
|
||
</span></code></pre>
|
||
<p>节点模式可以包含标签和属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>在 MATCH 中可以使用任何模式</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>带有节点属性的模式</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> p <span class="token operator">=</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>将路径分配给 p</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">OPTIONAL</span> <span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>可选模式：缺失部分将使用空值</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="where"><a aria-hidden="true" tabindex="-1" href="#where"><span class="icon icon-link"></span></a>WHERE</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">WHERE</span> n<span class="token punctuation">.</span>property <span class="token operator"><></span> <span class="token variable">$value</span>
|
||
</span></code></pre>
|
||
<p>使用谓词进行过滤。请注意，WHERE 总是作为 MATCH、OPTIONAL MATCH 或 WITH 子句的一部分。在查询中的其他子句之后放置它将改变它的作用</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">WHERE</span> <span class="token keyword">EXISTS</span> <span class="token punctuation">{</span>
|
||
</span><span class="code-line"> <span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span> <span class="token keyword">WHERE</span> n<span class="token punctuation">.</span>age <span class="token operator">=</span> m<span class="token punctuation">.</span>age
|
||
</span><span class="code-line"><span class="token punctuation">}</span>
|
||
</span></code></pre>
|
||
<p>使用存在性子查询进行过滤。</p>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="return"><a aria-hidden="true" tabindex="-1" href="#return"><span class="icon icon-link"></span></a>RETURN</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">RETURN</span> <span class="token operator">*</span>
|
||
</span></code></pre>
|
||
<p>返回所有变量的值</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">RETURN</span> n <span class="token keyword">AS</span> columnName
|
||
</span></code></pre>
|
||
<p>为结果列名使用别名</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">RETURN</span> <span class="token keyword">DISTINCT</span> n
|
||
</span></code></pre>
|
||
<p>返回唯一的行</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">ORDER</span> <span class="token keyword">BY</span> n<span class="token punctuation">.</span>property
|
||
</span></code></pre>
|
||
<p>对结果进行排序</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">ORDER</span> <span class="token keyword">BY</span> n<span class="token punctuation">.</span>property <span class="token keyword">DESC</span>
|
||
</span></code></pre>
|
||
<p>按降序对结果进行排序</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">SKIP</span> <span class="token variable">$skipNumber</span>
|
||
</span></code></pre>
|
||
<p>跳过一定数量的结果</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">LIMIT</span> <span class="token variable">$limitNumber</span>
|
||
</span></code></pre>
|
||
<p>限制结果的数量</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">SKIP</span> <span class="token variable">$skipNumber</span> <span class="token keyword">LIMIT</span> <span class="token variable">$limitNumber</span>
|
||
</span></code></pre>
|
||
<p>跳过顶部的结果并限制结果的数量</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">RETURN</span> <span class="token function">count</span><span class="token punctuation">(</span><span class="token operator">*</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>匹配行的数量。参见聚合函数了解更多</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="with"><a aria-hidden="true" tabindex="-1" href="#with"><span class="icon icon-link"></span></a>WITH</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>user<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIEND</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span>friend<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> user<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token variable">$name</span>
|
||
</span><span class="code-line"><span class="token keyword">WITH</span> user<span class="token punctuation">,</span> <span class="token function">count</span><span class="token punctuation">(</span>friend<span class="token punctuation">)</span> <span class="token keyword">AS</span> friends
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> friends <span class="token operator">></span> <span class="token number">10</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> user
|
||
</span></code></pre>
|
||
<p>WITH 语法类似于 RETURN。它明确地分隔查询部分，允许您声明要传递到下一部分的变量</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>user<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIEND</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span>friend<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WITH</span> user<span class="token punctuation">,</span> <span class="token function">count</span><span class="token punctuation">(</span>friend<span class="token punctuation">)</span> <span class="token keyword">AS</span> friends
|
||
</span><span class="code-line"><span class="token keyword">ORDER</span> <span class="token keyword">BY</span> friends <span class="token keyword">DESC</span>
|
||
</span><span class="code-line"> <span class="token keyword">SKIP</span> <span class="token number">1</span>
|
||
</span><span class="code-line"> <span class="token keyword">LIMIT</span> <span class="token number">3</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> user
|
||
</span></code></pre>
|
||
<p>ORDER BY、SKIP 和 LIMIT 也可以与 WITH 一起使用</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="union"><a aria-hidden="true" tabindex="-1" href="#union"><span class="icon icon-link"></span></a>UNION</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> b<span class="token punctuation">.</span>name
|
||
</span><span class="code-line"><span class="token keyword">UNION</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">LOVES</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> b<span class="token punctuation">.</span>name
|
||
</span></code></pre>
|
||
<p>返回所有查询结果的唯一并集。结果列的类型和名称必须匹配</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> b<span class="token punctuation">.</span>name
|
||
</span><span class="code-line"><span class="token keyword">UNION</span> <span class="token keyword">ALL</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">LOVES</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> b<span class="token punctuation">.</span>name
|
||
</span></code></pre>
|
||
<p>返回所有查询结果的并集，包括重复行</p>
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="neo4j-写入数据"><a aria-hidden="true" tabindex="-1" href="#neo4j-写入数据"><span class="icon icon-link"></span></a>Neo4j 写入数据</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="create"><a aria-hidden="true" tabindex="-1" href="#create"><span class="icon icon-link"></span></a>CREATE</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>创建具有指定属性的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n <span class="token variable">$map</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>创建具有指定属性的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">UNWIND</span> <span class="token variable">$listOfMaps</span> <span class="token keyword">AS</span> properties
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span> <span class="token keyword">SET</span> n <span class="token operator">=</span> properties
|
||
</span></code></pre>
|
||
<p>创建具有指定属性的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>创建具有指定类型和方向的关系；将变量绑定到它</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token class-name">LOVES</span> <span class="token punctuation">{</span>since<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>创建具有指定类型、方向和属性的关系</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="set"><a aria-hidden="true" tabindex="-1" href="#set"><span class="icon icon-link"></span></a>SET</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">SET</span> n<span class="token punctuation">.</span>property1 <span class="token operator">=</span> <span class="token variable">$value1</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> n<span class="token punctuation">.</span>property2 <span class="token operator">=</span> <span class="token variable">$value2</span>
|
||
</span></code></pre>
|
||
<p>更新或创建属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">SET</span> n <span class="token operator">=</span> <span class="token variable">$map</span>
|
||
</span></code></pre>
|
||
<p>设置所有属性。这将删除任何现有属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">SET</span> n <span class="token operator">+</span><span class="token operator">=</span> <span class="token variable">$map</span>
|
||
</span></code></pre>
|
||
<p>添加和更新属性，同时保留现有属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">SET</span> n<span class="token operator">:</span>Person
|
||
</span></code></pre>
|
||
<p>向节点添加一个标签 Person</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="merge"><a aria-hidden="true" tabindex="-1" href="#merge"><span class="icon icon-link"></span></a>MERGE</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MERGE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">ON</span> <span class="token keyword">CREATE</span> <span class="token keyword">SET</span> n<span class="token punctuation">.</span>created <span class="token operator">=</span> <span class="token function">timestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">ON</span> <span class="token keyword">MATCH</span> <span class="token keyword">SET</span>
|
||
</span><span class="code-line"> n<span class="token punctuation">.</span>counter <span class="token operator">=</span> <span class="token function">coalesce</span><span class="token punctuation">(</span>n<span class="token punctuation">.</span>counter<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> n<span class="token punctuation">.</span>accessTime <span class="token operator">=</span> <span class="token function">timestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>匹配模式或在不存在时创建它。使用 ON CREATE 和 ON MATCH 进行条件更新</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value1</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> <span class="token punctuation">(</span>b<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value2</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">MERGE</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token operator">:</span><span class="token relationship property">LOVES</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>MERGE 查找或创建节点之间的关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value1</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">MERGE</span>
|
||
</span><span class="code-line"> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value3</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>MERGE 查找或创建与节点关联的路径</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="delete"><a aria-hidden="true" tabindex="-1" href="#delete"><span class="icon icon-link"></span></a>DELETE</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">DELETE</span> n<span class="token punctuation">,</span> r
|
||
</span></code></pre>
|
||
<p>删除一个节点和一个关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">DETACH</span> <span class="token keyword">DELETE</span> n
|
||
</span></code></pre>
|
||
<p>删除一个节点以及与其连接的所有关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">DETACH</span> <span class="token keyword">DELETE</span> n
|
||
</span></code></pre>
|
||
<p>从数据库中删除所有节点和关系</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="remove"><a aria-hidden="true" tabindex="-1" href="#remove"><span class="icon icon-link"></span></a>REMOVE</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">REMOVE</span> n<span class="token operator">:</span>Person
|
||
</span></code></pre>
|
||
<p>从 n 中移除一个标签</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">REMOVE</span> n<span class="token punctuation">.</span>property
|
||
</span></code></pre>
|
||
<p>移除一个属性</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="foreach"><a aria-hidden="true" tabindex="-1" href="#foreach"><span class="icon icon-link"></span></a>FOREACH</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">FOREACH</span> <span class="token punctuation">(</span>r <span class="token keyword">IN</span> <span class="token function">relationships</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span> <span class="token operator">|</span>
|
||
</span><span class="code-line"> <span class="token keyword">SET</span> r<span class="token punctuation">.</span>marked <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>对路径中的每个关系执行一个变异操作。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">FOREACH</span> <span class="token punctuation">(</span>value <span class="token keyword">IN</span> coll <span class="token operator">|</span>
|
||
</span><span class="code-line"> <span class="token keyword">CREATE</span> <span class="token punctuation">(</span><span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> value<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>对列表中的每个元素执行一个变异操作。</p>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="调用子查询"><a aria-hidden="true" tabindex="-1" href="#调用子查询"><span class="icon icon-link"></span></a>调用子查询</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CALL</span> <span class="token punctuation">{</span>
|
||
</span><span class="code-line"> <span class="token keyword">MATCH</span> <span class="token punctuation">(</span>p<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIEND_OF</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>other<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> p<span class="token punctuation">,</span> other
|
||
</span><span class="code-line"> <span class="token keyword">UNION</span>
|
||
</span><span class="code-line"> <span class="token keyword">MATCH</span> <span class="token punctuation">(</span>p<span class="token operator">:</span><span class="token class-name">Child</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">CHILD_OF</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>other<span class="token operator">:</span><span class="token class-name">Parent</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> p<span class="token punctuation">,</span> other
|
||
</span><span class="code-line"><span class="token punctuation">}</span>
|
||
</span></code></pre>
|
||
<p>这调用了一个具有两个联合部分的子查询。子查询的结果之后可以进行后处理。</p>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="调用存储过程"><a aria-hidden="true" tabindex="-1" href="#调用存储过程"><span class="icon icon-link"></span></a>调用存储过程</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CALL</span> db<span class="token punctuation">.</span><span class="token function">labels</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">YIELD</span> label
|
||
</span></code></pre>
|
||
<p>这显示了对内置过程 db.labels 的独立调用，以列出数据库中使用的所有标签。请注意，所需的过程参数在过程名称后的括号中明确给出。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CALL</span> db<span class="token punctuation">.</span><span class="token function">labels</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">YIELD</span> <span class="token operator">*</span>
|
||
</span></code></pre>
|
||
<p>独立调用可以使用 YIELD * 返回所有列。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CALL</span> java<span class="token punctuation">.</span>stored<span class="token punctuation">.</span>procedureWithArgs
|
||
</span></code></pre>
|
||
<p>独立调用可以省略 YIELD，并且也可以通过语句参数隐式提供参数，例如，一个需要一个参数输入的独立调用可以通过传递参数映射 {input: 'foo'} 来运行。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CALL</span> db<span class="token punctuation">.</span><span class="token function">labels</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">YIELD</span> label
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token function">count</span><span class="token punctuation">(</span>label<span class="token punctuation">)</span> <span class="token keyword">AS</span> count
|
||
</span></code></pre>
|
||
<p>在更大的查询中调用内置过程 db.labels 来计算数据库中使用的所有标签。在更大的查询中进行调用时，总是需要显式传递参数和使用 YIELD 明确命名结果。</p>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2 row-span-3"><div class="wrap-header h3wrap"><h3 id="导入"><a aria-hidden="true" tabindex="-1" href="#导入"><span class="icon icon-link"></span></a>导入</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2 row-span-3-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">LOAD</span> <span class="token keyword">CSV</span> FROM
|
||
</span><span class="code-line"><span class="token string">'https://neo4j.com/docs/cypher-refcard/4.3/csv/artists.csv'</span> <span class="token keyword">AS</span> line
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span><span class="token operator">:</span><span class="token class-name">Artist</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> line<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span> year<span class="token operator">:</span> <span class="token function">toInteger</span><span class="token punctuation">(</span>line<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从 CSV 文件加载数据并创建节点。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">LOAD</span> <span class="token keyword">CSV</span> <span class="token keyword">WITH</span> HEADERS FROM
|
||
</span><span class="code-line"><span class="token string">'https://neo4j.com/docs/cypher-refcard/4.3/csv/artists-with-headers.csv'</span> <span class="token keyword">AS</span> line
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span><span class="token operator">:</span><span class="token class-name">Artist</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> line<span class="token punctuation">.</span>Name<span class="token punctuation">,</span> year<span class="token operator">:</span> <span class="token function">toInteger</span><span class="token punctuation">(</span>line<span class="token punctuation">.</span>Year<span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>加载包含标题的 CSV 数据。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">USING</span> <span class="token keyword">PERIODIC</span> <span class="token keyword">COMMIT</span> <span class="token number">500</span>
|
||
</span><span class="code-line"><span class="token keyword">LOAD</span> <span class="token keyword">CSV</span> <span class="token keyword">WITH</span> HEADERS FROM
|
||
</span><span class="code-line"><span class="token string">'https://neo4j.com/docs/cypher-refcard/4.3/csv/artists-with-headers.csv'</span> <span class="token keyword">AS</span> line
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span><span class="token operator">:</span><span class="token class-name">Artist</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> line<span class="token punctuation">.</span>Name<span class="token punctuation">,</span> year<span class="token operator">:</span> <span class="token function">toInteger</span><span class="token punctuation">(</span>line<span class="token punctuation">.</span>Year<span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>在导入大量数据时，每处理500行后提交当前事务。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">LOAD</span> <span class="token keyword">CSV</span> FROM
|
||
</span><span class="code-line"><span class="token string">'https://neo4j.com/docs/cypher-refcard/4.3/csv/artists-fieldterminator.csv'</span>
|
||
</span><span class="code-line"><span class="token keyword">AS</span> line FIELDTERMINATOR <span class="token string">';'</span>
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span><span class="token operator">:</span><span class="token class-name">Artist</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> line<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span> year<span class="token operator">:</span> <span class="token function">toInteger</span><span class="token punctuation">(</span>line<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>使用不同的字段分隔符，而不是默认的逗号（周围没有空白）。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">LOAD</span> <span class="token keyword">CSV</span> FROM
|
||
</span><span class="code-line"><span class="token string">'https://neo4j.com/docs/cypher-refcard/4.3/csv/artists.csv'</span> <span class="token keyword">AS</span> line
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token keyword">DISTINCT</span> <span class="token function">file</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回 LOAD CSV 处理的文件的绝对路径，如果在 LOAD CSV 上下文之外调用则返回 null。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">LOAD</span> <span class="token keyword">CSV</span> FROM
|
||
</span><span class="code-line"><span class="token string">'https://neo4j.com/docs/cypher-refcard/4.3/csv/artists.csv'</span> <span class="token keyword">AS</span> line
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token function">linenumber</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回 LOAD CSV 当前正在处理的行号，如果在 LOAD CSV 上下文之外调用则返回 null。</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="运算符"><a aria-hidden="true" tabindex="-1" href="#运算符"><span class="icon icon-link"></span></a>运算符</h3><div class="wrap-body">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<table class="left-align"><thead><tr><th></th><th></th></tr></thead><tbody><tr><td><strong>通用</strong></td><td>DISTINCT, ., []</td></tr><tr><td><strong>数学</strong></td><td>+, -, *, /, %, ^</td></tr><tr><td><strong>比较</strong></td><td>=, <>, <, >, <=, >=, IS NULL, IS NOT NULL</td></tr><tr><td><strong>布尔</strong></td><td>AND, OR, XOR, NOT</td></tr><tr><td><strong>字符串</strong></td><td>+</td></tr><tr><td><strong>列表</strong></td><td>+, IN, [x], [x .. y]</td></tr><tr><td><strong>正则表达式</strong></td><td>=~</td></tr><tr><td><strong>字符串匹配</strong></td><td>STARTS WITH, ENDS WITH, CONTAINS</td></tr></tbody></table>
|
||
<!--rehype:className=left-align-->
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="null"><a aria-hidden="true" tabindex="-1" href="#null"><span class="icon icon-link"></span></a>null</h3><div class="wrap-body">
|
||
<ul>
|
||
<li><code>null</code> 用于表示缺失/未定义的值。</li>
|
||
<li><code>null</code> 不等于 <code>null</code>。不知道两个值是否相等并不意味着它们是相同的值。因此，表达式 <code>null = null</code> 得到的是 <code>null</code> 而不是 <code>true</code>。要检查表达式是否为 <code>null</code>，请使用 <code>IS NULL</code>。</li>
|
||
<li>算术表达式、比较和函数调用（除了 <code>coalesce</code>）将返回 <code>null</code> 如果任何参数为 <code>null</code>。</li>
|
||
<li>尝试访问列表中缺失的元素或不存在的属性将得到 <code>null</code>。</li>
|
||
<li>在 <code>OPTIONAL MATCH</code> 子句中，缺失部分的模式将使用 <code>null</code>。</li>
|
||
</ul>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-4"><div class="wrap-header h3wrap"><h3 id="patterns"><a aria-hidden="true" tabindex="-1" href="#patterns"><span class="icon icon-link"></span></a>Patterns</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-4-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>具有 Person 标签的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token operator">:</span><span class="token class-name">Swedish</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>具有 Person 和 Swedish 标签的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>具有声明的属性的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>匹配具有声明的属性的关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从 n 到 m 的关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">--</span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>在 n 和 m 之间的任意方向上的关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>带有指向 m 的关系的标记为 Person 的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>m<span class="token punctuation">)</span><span class="token operator"><-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从 n 到 m 的类型为 KNOWS 的关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token operator">|</span><span class="token operator">:</span><span class="token relationship property">LOVES</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从 n 到 m 的类型为 KNOWS 或类型为 LOVES 的关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>将关系绑定到变量 r</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">*</span><span class="token number">1</span><span class="token operator">..</span><span class="token number">5</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从 n 到 m 之间的 1 到 5 个关系的变长路径</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">*</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从 n 到 m 之间的任意数量的关系的变长路径。（请参阅性能部分）</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m <span class="token punctuation">{</span>property<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从节点 n 到节点 m，类型为 KNOWS 的关系，具有声明的属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">shortestPath</span><span class="token punctuation">(</span><span class="token punctuation">(</span>n1<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">*</span><span class="token operator">..</span><span class="token number">6</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span>n2<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>查找单一最短路径</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">allShortestPaths</span><span class="token punctuation">(</span><span class="token punctuation">(</span>n1<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">*</span><span class="token operator">..</span><span class="token number">6</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>n2<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>查找所有最短路径</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>计算与模式匹配的路径数量</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="use"><a aria-hidden="true" tabindex="-1" href="#use"><span class="icon icon-link"></span></a>USE</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">USE myDatabase
|
||
</span></code></pre>
|
||
<p>选择 myDatabase 来执行查询，或针对其执行查询的部分</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">USE neo4j
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> n<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">'Alice'</span>
|
||
</span></code></pre>
|
||
<p>针对 Neo4j 数据库执行的 MATCH 查询</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="show-functions-和-procedures"><a aria-hidden="true" tabindex="-1" href="#show-functions-和-procedures"><span class="icon icon-link"></span></a>SHOW FUNCTIONS 和 PROCEDURES</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">SHOW FUNCTIONS
|
||
</span></code></pre>
|
||
<p>列出所有可用函数</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">SHOW PROCEDURES EXECUTABLE <span class="token keyword">YIELD</span> name
|
||
</span></code></pre>
|
||
<p>列出当前用户可以执行的所有过程，并仅返回过程的名称</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="标签"><a aria-hidden="true" tabindex="-1" href="#标签"><span class="icon icon-link"></span></a>标签</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>创建一个带有标签和属性的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MERGE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$value</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>匹配或创建具有该标签和属性的唯一节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">SET</span> n<span class="token operator">:</span><span class="token class-name">Spouse</span><span class="token operator">:</span><span class="token class-name">Parent</span><span class="token operator">:</span>Employee
|
||
</span></code></pre>
|
||
<p>向节点添加标签</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>匹配标记为“Person”的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> n<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token variable">$value</span>
|
||
</span><span class="code-line">
|
||
</span></code></pre>
|
||
<p>匹配具有给定名称的标记为“Person”的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">WHERE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>检查节点上标签的存在</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">labels</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>节点的标签</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">REMOVE</span> n<span class="token operator">:</span>Person
|
||
</span></code></pre>
|
||
<p>从节点中移除标签</p>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="lists"><a aria-hidden="true" tabindex="-1" href="#lists"><span class="icon icon-link"></span></a>Lists</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">,</span> <span class="token string">'c'</span><span class="token punctuation">]</span> <span class="token keyword">AS</span> list
|
||
</span></code></pre>
|
||
<p>文字列表用方括号声明</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">size</span><span class="token punctuation">(</span><span class="token variable">$list</span><span class="token punctuation">)</span> <span class="token keyword">AS</span> len<span class="token punctuation">,</span> <span class="token variable">$list</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token keyword">AS</span> value
|
||
</span></code></pre>
|
||
<p>列表可以作为参数传递</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">range</span><span class="token punctuation">(</span><span class="token variable">$firstNum</span><span class="token punctuation">,</span> <span class="token variable">$lastNum</span><span class="token punctuation">,</span> <span class="token variable">$step</span><span class="token punctuation">)</span> <span class="token keyword">AS</span> list
|
||
</span></code></pre>
|
||
<p>range() 创建一个数字列表（step是可选的），其他返回列表的函数有：labels()、nodes()、relationships()</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> p <span class="token operator">=</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token operator">*</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token function">relationships</span><span class="token punctuation">(</span>p<span class="token punctuation">)</span> <span class="token keyword">AS</span> r
|
||
</span></code></pre>
|
||
<p>可以使用命名路径和 relationships() 返回变长路径的关系列表</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">RETURN</span> matchedNode<span class="token punctuation">.</span>list<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token keyword">AS</span> value<span class="token punctuation">,</span>
|
||
</span><span class="code-line"> <span class="token function">size</span><span class="token punctuation">(</span>matchedNode<span class="token punctuation">.</span>list<span class="token punctuation">)</span> <span class="token keyword">AS</span> len
|
||
</span></code></pre>
|
||
<p>属性可以是字符串、数字或布尔值的列表。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">list<span class="token punctuation">[</span><span class="token variable">$idx</span><span class="token punctuation">]</span> <span class="token keyword">AS</span> value<span class="token punctuation">,</span>
|
||
</span><span class="code-line">list<span class="token punctuation">[</span><span class="token variable">$startIdx</span><span class="token operator">..</span><span class="token variable">$endIdx</span><span class="token punctuation">]</span> <span class="token keyword">AS</span> slice
|
||
</span></code></pre>
|
||
<p>可以使用方括号中的 idx 下标来访问列表元素。无效的索引返回 null。可以使用起始索引到结束索引的间隔来检索片段，每个索引都可以省略或为负数。超出范围的元素将被忽略</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">UNWIND</span> <span class="token variable">$names</span> <span class="token keyword">AS</span> name
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n <span class="token punctuation">{</span>name<span class="token operator">:</span> name<span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token function">avg</span><span class="token punctuation">(</span>n<span class="token punctuation">.</span>age<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>使用 UNWIND，任何列表都可以转换回单独的行。该示例匹配一个名字列表中的所有名字</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token punctuation">[</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span> <span class="token keyword">WHERE</span> b<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">'Bob'</span> <span class="token operator">|</span> b<span class="token punctuation">.</span>age<span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>可以使用模式推导直接从匹配中进行自定义投影</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>person<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> person <span class="token punctuation">{</span> <span class="token punctuation">.</span>name<span class="token punctuation">,</span> <span class="token punctuation">.</span>age<span class="token punctuation">}</span>
|
||
</span></code></pre>
|
||
<p>映射投影可以很容易地从节点、关系和其他映射值构造出来</p>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="maps"><a aria-hidden="true" tabindex="-1" href="#maps"><span class="icon icon-link"></span></a>Maps</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">,</span> age<span class="token operator">:</span> <span class="token number">38</span><span class="token punctuation">,</span> address<span class="token operator">:</span> <span class="token punctuation">{</span>
|
||
</span><span class="code-line"> city<span class="token operator">:</span> <span class="token string">'London'</span><span class="token punctuation">,</span>residential<span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">}</span><span class="token punctuation">}</span>
|
||
</span></code></pre>
|
||
<p>文字映射使用大括号声明，就像属性映射一样。支持列表</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">WITH</span> <span class="token punctuation">{</span>person<span class="token operator">:</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Anne'</span><span class="token punctuation">,</span> age<span class="token operator">:</span> <span class="token number">25</span><span class="token punctuation">}</span><span class="token punctuation">}</span> <span class="token keyword">AS</span> p
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> p<span class="token punctuation">.</span>person<span class="token punctuation">.</span>name
|
||
</span></code></pre>
|
||
<p>访问嵌套映射的属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MERGE</span> <span class="token punctuation">(</span>p<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token variable">$map</span><span class="token punctuation">.</span>name<span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">ON</span> <span class="token keyword">CREATE</span> <span class="token keyword">SET</span> p <span class="token operator">=</span> <span class="token variable">$map</span>
|
||
</span></code></pre>
|
||
<p>映射可以作为参数传递，并且可以作为映射或通过访问键来使用</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>matchedNode<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> matchedNode
|
||
</span></code></pre>
|
||
<p>节点和关系被返回为它们数据的映射</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">map<span class="token punctuation">.</span>name<span class="token punctuation">,</span> map<span class="token punctuation">.</span>age<span class="token punctuation">,</span> map<span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>可以通过它们的键访问映射条目。无效的键会导致错误</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="case"><a aria-hidden="true" tabindex="-1" href="#case"><span class="icon icon-link"></span></a>CASE</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CASE</span> n<span class="token punctuation">.</span>eyes
|
||
</span><span class="code-line"> <span class="token keyword">WHEN</span> <span class="token string">'blue'</span> <span class="token keyword">THEN</span> <span class="token number">1</span>
|
||
</span><span class="code-line"> <span class="token keyword">WHEN</span> <span class="token string">'brown'</span> <span class="token keyword">THEN</span> <span class="token number">2</span>
|
||
</span><span class="code-line"> <span class="token keyword">ELSE</span> <span class="token number">3</span>
|
||
</span><span class="code-line"><span class="token keyword">END</span>
|
||
</span></code></pre>
|
||
<p>从匹配的 WHEN 值返回 THEN 值。ELSE 值是可选的，如果缺失，则替换为 null</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CASE</span>
|
||
</span><span class="code-line"> <span class="token keyword">WHEN</span> n<span class="token punctuation">.</span>eyes <span class="token operator">=</span> <span class="token string">'blue'</span> <span class="token keyword">THEN</span> <span class="token number">1</span>
|
||
</span><span class="code-line"> <span class="token keyword">WHEN</span> n<span class="token punctuation">.</span>age <span class="token operator"><</span> <span class="token number">40</span> <span class="token keyword">THEN</span> <span class="token number">2</span>
|
||
</span><span class="code-line"> <span class="token keyword">ELSE</span> <span class="token number">3</span>
|
||
</span><span class="code-line"><span class="token keyword">END</span>
|
||
</span></code></pre>
|
||
<p>从第一个评估为 true 的 WHEN 谓词返回 THEN 值。谓词按顺序进行评估</p>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="predicates-谓词"><a aria-hidden="true" tabindex="-1" href="#predicates-谓词"><span class="icon icon-link"></span></a>Predicates 谓词</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">.</span>property <span class="token operator"><></span> <span class="token variable">$value</span>
|
||
</span></code></pre>
|
||
<p>使用比较运算符</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">toString</span><span class="token punctuation">(</span>n<span class="token punctuation">.</span>property<span class="token punctuation">)</span> <span class="token operator">=</span> <span class="token variable">$value</span>
|
||
</span></code></pre>
|
||
<p>使用函数</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">.</span>number <span class="token operator">>=</span> <span class="token number">1</span> <span class="token keyword">AND</span> n<span class="token punctuation">.</span>number <span class="token operator"><=</span> <span class="token number">10</span>
|
||
</span></code></pre>
|
||
<p>使用布尔运算符来组合谓词</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token number">1</span> <span class="token operator"><=</span> n<span class="token punctuation">.</span>number <span class="token operator"><=</span> <span class="token number">10</span>
|
||
</span></code></pre>
|
||
<p>使用链接运算符来组合谓词</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token operator">:</span>Person
|
||
</span></code></pre>
|
||
<p>检查节点标签</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">variable <span class="token keyword">IS</span> <span class="token keyword">NOT</span> <span class="token boolean">NULL</span>
|
||
</span></code></pre>
|
||
<p>检查某物是否不为 null，例如某个属性是否存在</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">.</span>property <span class="token keyword">IS</span> <span class="token boolean">NULL</span> <span class="token keyword">OR</span> n<span class="token punctuation">.</span>property <span class="token operator">=</span> <span class="token variable">$value</span>
|
||
</span></code></pre>
|
||
<p>要么属性不存在，要么谓词为 true</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">.</span>property <span class="token operator">=</span> <span class="token variable">$value</span>
|
||
</span></code></pre>
|
||
<p>不存在的属性返回 null，它与任何值都不相等</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">[</span><span class="token string">"property"</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token variable">$value</span>
|
||
</span></code></pre>
|
||
<p>也可以使用动态计算的属性名称来访问属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">.</span>property <span class="token keyword">STARTS</span> <span class="token keyword">WITH</span> <span class="token string">'Tim'</span> <span class="token keyword">OR</span>
|
||
</span><span class="code-line">n<span class="token punctuation">.</span>property <span class="token keyword">ENDS</span> <span class="token keyword">WITH</span> <span class="token string">'n'</span> <span class="token keyword">OR</span>
|
||
</span><span class="code-line">n<span class="token punctuation">.</span>property <span class="token keyword">CONTAINS</span> <span class="token string">'goodie'</span>
|
||
</span></code></pre>
|
||
<p>字符串匹配</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">.</span>property <span class="token operator">=~</span> <span class="token string">'Tim.*'</span>
|
||
</span></code></pre>
|
||
<p>字符串正则表达式匹配</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>确保模式至少有一个匹配项</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">NOT</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">KNOWS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>从结果中排除对 (n)-[:KNOWS]->(m) 的匹配</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line">n<span class="token punctuation">.</span>property <span class="token keyword">IN</span> <span class="token punctuation">[</span><span class="token variable">$value1</span><span class="token punctuation">,</span> <span class="token variable">$value2</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>检查一个元素是否存在于列表中</p>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="列表谓词"><a aria-hidden="true" tabindex="-1" href="#列表谓词"><span class="icon icon-link"></span></a>列表谓词</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">all</span><span class="token punctuation">(</span>x <span class="token keyword">IN</span> coll <span class="token keyword">WHERE</span> x<span class="token punctuation">.</span>property <span class="token keyword">IS</span> <span class="token keyword">NOT</span> <span class="token boolean">NULL</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>如果列表中所有元素都满足谓词，则返回 true。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">any</span><span class="token punctuation">(</span>x <span class="token keyword">IN</span> coll <span class="token keyword">WHERE</span> x<span class="token punctuation">.</span>property <span class="token keyword">IS</span> <span class="token keyword">NOT</span> <span class="token boolean">NULL</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>如果列表中至少有一个元素满足谓词，则返回 true。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">none</span><span class="token punctuation">(</span>x <span class="token keyword">IN</span> coll <span class="token keyword">WHERE</span> x<span class="token punctuation">.</span>property <span class="token keyword">IS</span> <span class="token keyword">NOT</span> <span class="token boolean">NULL</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>如果列表中所有元素都不满足谓词，则返回 true。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">single</span><span class="token punctuation">(</span>x <span class="token keyword">IN</span> coll <span class="token keyword">WHERE</span> x<span class="token punctuation">.</span>property <span class="token keyword">IS</span> <span class="token keyword">NOT</span> <span class="token boolean">NULL</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>如果列表中恰好有一个元素满足谓词，则返回 true。</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="列表表达式"><a aria-hidden="true" tabindex="-1" href="#列表表达式"><span class="icon icon-link"></span></a>列表表达式</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">size</span><span class="token punctuation">(</span><span class="token variable">$list</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>列表中的元素数量</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">reverse</span><span class="token punctuation">(</span><span class="token variable">$list</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>反转列表中元素的顺序</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">head</span><span class="token punctuation">(</span><span class="token variable">$list</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">last</span><span class="token punctuation">(</span><span class="token variable">$list</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">tail</span><span class="token punctuation">(</span><span class="token variable">$list</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>head() 返回列表的第一个元素，last() 返回列表的最后一个元素。tail() 返回除第一个元素外的所有元素。对于空列表，所有函数返回 null</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span>x <span class="token keyword">IN</span> list <span class="token operator">|</span> x<span class="token punctuation">.</span>prop<span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>对原始列表中每个元素的表达式值组成的列表</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span>x <span class="token keyword">IN</span> list <span class="token keyword">WHERE</span> x<span class="token punctuation">.</span>prop <span class="token operator"><></span> <span class="token variable">$value</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>过滤出谓词为 true 的元素组成的列表</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span>x <span class="token keyword">IN</span> list <span class="token keyword">WHERE</span> x<span class="token punctuation">.</span>prop <span class="token operator"><></span> <span class="token variable">$value</span> <span class="token operator">|</span> x<span class="token punctuation">.</span>prop<span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>对列表进行过滤，并从每个符合条件的元素中提取表达式的值</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">reduce</span><span class="token punctuation">(</span>s <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">,</span> x <span class="token keyword">IN</span> list <span class="token operator">|</span> s <span class="token operator">+</span> x<span class="token punctuation">.</span>prop<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>对列表中的每个元素求值，并累积结果</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="函数"><a aria-hidden="true" tabindex="-1" href="#函数"><span class="icon icon-link"></span></a>函数</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">coalesce</span><span class="token punctuation">(</span>n<span class="token punctuation">.</span>property<span class="token punctuation">,</span> <span class="token variable">$defaultValue</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回第一个非空表达式</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">timestamp</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>自1970年1月1日UTC午夜以来的毫秒数</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">id</span><span class="token punctuation">(</span>nodeOrRelationship<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>关系或节点的内部ID</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">toInteger</span><span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>将给定的输入转换为整数（如果可能），否则返回 null</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">toFloat</span><span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>将给定的输入转换为浮点数（如果可能），否则返回 null</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">toBoolean</span><span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>将给定的输入转换为布尔值（如果可能），否则返回 null</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">keys</span><span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回节点、关系或映射的属性名称的字符串表示形式列表</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">properties</span><span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回包含节点或关系的所有属性的映射</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="路径函数"><a aria-hidden="true" tabindex="-1" href="#路径函数"><span class="icon icon-link"></span></a>路径函数</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">length</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>路径中的关系数量。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">nodes</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>路径中的节点列表。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">relationships</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>路径中的关系列表。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token punctuation">[</span>x <span class="token keyword">IN</span> <span class="token function">nodes</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span> <span class="token operator">|</span> x<span class="token punctuation">.</span>prop<span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>从路径中的节点中提取属性。</p>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="空间函数"><a aria-hidden="true" tabindex="-1" href="#空间函数"><span class="icon icon-link"></span></a>空间函数</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>x<span class="token operator">:</span> <span class="token variable">$x</span><span class="token punctuation">,</span> y<span class="token operator">:</span> <span class="token variable">$y</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回一个二维笛卡尔坐标系中的点。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>latitude<span class="token operator">:</span> <span class="token variable">$y</span><span class="token punctuation">,</span> longitude<span class="token operator">:</span> <span class="token variable">$x</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回一个二维地理坐标系中的点，坐标以十进制度数指定。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>x<span class="token operator">:</span> <span class="token variable">$x</span><span class="token punctuation">,</span> y<span class="token operator">:</span> <span class="token variable">$y</span><span class="token punctuation">,</span> z<span class="token operator">:</span> <span class="token variable">$z</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回一个三维笛卡尔坐标系中的点。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>latitude<span class="token operator">:</span> <span class="token variable">$y</span><span class="token punctuation">,</span> longitude<span class="token operator">:</span> <span class="token variable">$x</span><span class="token punctuation">,</span> height<span class="token operator">:</span> <span class="token variable">$z</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回一个三维地理坐标系中的点，纬度和经度以十进制度数表示，高度以米为单位。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">distance</span><span class="token punctuation">(</span><span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>x<span class="token operator">:</span> <span class="token variable">$x1</span><span class="token punctuation">,</span> y<span class="token operator">:</span> <span class="token variable">$y1</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>x<span class="token operator">:</span> <span class="token variable">$x2</span><span class="token punctuation">,</span> y<span class="token operator">:</span> <span class="token variable">$y2</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回一个浮点数，表示两点之间的线性距离。返回的单位将与点坐标的单位相同，它适用于二维和三维笛卡尔点。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token function">distance</span><span class="token punctuation">(</span><span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>latitude<span class="token operator">:</span> <span class="token variable">$y1</span><span class="token punctuation">,</span> longitude<span class="token operator">:</span> <span class="token variable">$x1</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">point</span><span class="token punctuation">(</span><span class="token punctuation">{</span>latitude<span class="token operator">:</span> <span class="token variable">$y2</span><span class="token punctuation">,</span> longitude<span class="token operator">:</span> <span class="token variable">$x2</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>返回两点之间的大地距离，单位为米。它也可以用于三维地理点。</p>
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="neo4j-示例"><a aria-hidden="true" tabindex="-1" href="#neo4j-示例"><span class="icon icon-link"></span></a>Neo4j 示例</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="创建"><a aria-hidden="true" tabindex="-1" href="#创建"><span class="icon icon-link"></span></a>创建</h3><div class="wrap-body">
|
||
<p>创建多个节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Sally'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> n<span class="token punctuation">;</span>
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Steve'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> n<span class="token punctuation">;</span>
|
||
</span></code></pre>
|
||
<p>创建 <code>FRIENDS</code> 关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Sally'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> <span class="token punctuation">(</span>b<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Steve'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">MERGE</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>创建节点的时候就建好 <code>FRIENDS</code> 关系</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Todd'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Carlos'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>为创建完成的关系增加 <code>since</code> 属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Sally'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> <span class="token punctuation">(</span>b<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Steve'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">MERGE</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token class-name">FRIENDS</span> <span class="token punctuation">{</span>since<span class="token operator">:</span><span class="token number">2001</span><span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="删除"><a aria-hidden="true" tabindex="-1" href="#删除"><span class="icon icon-link"></span></a>删除</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2-->
|
||
<p>删除所有节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span> <span class="token keyword">DETACH</span> <span class="token keyword">DELETE</span> n
|
||
</span></code></pre>
|
||
<p>删除 <code>Person</code>中 <code>name</code>为 <code>Mike</code>节点的 <code>test</code>属性</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Mike'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">SET</span> a<span class="token punctuation">.</span>test<span class="token operator">=</span><span class="token string">'test'</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Mike'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">REMOVE</span> a<span class="token punctuation">.</span>test
|
||
</span></code></pre>
|
||
<p>删除 <code>Location</code> 中 <code>city</code> 为 <code>Portland</code> 的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Location</span> <span class="token punctuation">{</span>city<span class="token operator">:</span><span class="token string">'Portland'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">DELETE</span> a
|
||
</span></code></pre>
|
||
<p>删除有关系的节点（此处rel是写死的，指的是所有关系）</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Todd'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>rel<span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span>b<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span> <span class="token keyword">DELETE</span> a<span class="token punctuation">,</span>b<span class="token punctuation">,</span>rel
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-3"><div class="wrap-header h3wrap"><h3 id="查询"><a aria-hidden="true" tabindex="-1" href="#查询"><span class="icon icon-link"></span></a>查询</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-3-->
|
||
<p>查询所有在 <code>Boston</code> 出生的人物</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">BORN_IN</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>b<span class="token operator">:</span><span class="token class-name">Location</span> <span class="token punctuation">{</span>city<span class="token operator">:</span><span class="token string">'Boston'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> a<span class="token punctuation">,</span>b
|
||
</span></code></pre>
|
||
<p>查询所有对外有关系的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">--></span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> a
|
||
</span></code></pre>
|
||
<p>查询所有有关系的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">--</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> a
|
||
</span></code></pre>
|
||
<p>查询所有对外有关系的节点，以及关系类型</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> a<span class="token punctuation">.</span>name<span class="token punctuation">,</span> <span class="token function">type</span><span class="token punctuation">(</span>r<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p>查询所有有结婚关系的节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">MARRIED</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">RETURN</span> n
|
||
</span></code></pre>
|
||
<p>查找某人的朋友的朋友</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Mike'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r1<span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r2<span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span>friend_of_a_friend<span class="token punctuation">)</span> <span class="token keyword">RETURN</span> friend_of_a_friend<span class="token punctuation">.</span>name <span class="token keyword">AS</span> fofName
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="创建节点和关系"><a aria-hidden="true" tabindex="-1" href="#创建节点和关系"><span class="icon icon-link"></span></a>创建节点和关系</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token comment">// 创建节点</span>
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">,</span> age<span class="token operator">:</span> <span class="token number">30</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Bob'</span><span class="token punctuation">,</span> age<span class="token operator">:</span> <span class="token number">25</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">// 创建关系</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>alice<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>bob<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Bob'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">CREATE</span> <span class="token punctuation">(</span>alice<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>bob<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="增加修改节点的属性"><a aria-hidden="true" tabindex="-1" href="#增加修改节点的属性"><span class="icon icon-link"></span></a>增加/修改节点的属性</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Liz'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">SET</span> a<span class="token punctuation">.</span>age<span class="token operator">=</span><span class="token number">34</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Shaw'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">SET</span> a<span class="token punctuation">.</span>age<span class="token operator">=</span><span class="token number">32</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'John'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">SET</span> a<span class="token punctuation">.</span>age<span class="token operator">=</span><span class="token number">44</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>a<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span><span class="token string">'Mike'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">SET</span> a<span class="token punctuation">.</span>age<span class="token operator">=</span><span class="token number">25</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="查询节点和关系"><a aria-hidden="true" tabindex="-1" href="#查询节点和关系"><span class="icon icon-link"></span></a>查询节点和关系</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token comment">// 查询所有节点和关系</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> n
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">// 查询特定节点</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> n<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">'Alice'</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> n
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">// 查询节点的关系</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>r<span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> n<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">'Alice'</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> r
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="更新节点和关系"><a aria-hidden="true" tabindex="-1" href="#更新节点和关系"><span class="icon icon-link"></span></a>更新节点和关系</h3><div class="wrap-body">
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token comment">// 更新节点属性</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">SET</span> n<span class="token punctuation">.</span>age <span class="token operator">=</span> <span class="token number">31</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> n
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">// 删除节点</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>n<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Bob'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">DELETE</span> n
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2 row-span-2"><div class="wrap-header h3wrap"><h3 id="更复杂的查询"><a aria-hidden="true" tabindex="-1" href="#更复杂的查询"><span class="icon icon-link"></span></a>更复杂的查询</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2 row-span-2-->
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token comment">// 查找 Alice 的朋友的朋友</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>alice<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>fof<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> fof
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">// 查找共同朋友，这里的“,”相当于 AND 条件</span>
|
||
</span><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>alice<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>friend<span class="token punctuation">)</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> <span class="token punctuation">(</span>bob<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Bob'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">FRIENDS</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>friend<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> friend
|
||
</span></code></pre>
|
||
<p>通过观察<code>John的朋友</code>看过的电影为<code>John</code>推荐电影，并且不再推荐<code>John</code>他自己已经看过的电影。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span>tom<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">"John Johnson"</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">IS_FRIEND_OF</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>user<span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">HAS_SEEN</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>movie<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> <span class="token keyword">NOT</span> tom<span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">HAS_SEEN</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>movie<span class="token punctuation">)</span> <span class="token keyword">RETURN</span> movie<span class="token punctuation">.</span>name<span class="token punctuation">;</span>
|
||
</span></code></pre>
|
||
<p>找出所有标题以<code>Apollo</code>开头且发行年份早于<code>1996</code>年的电影节点</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">MATCH</span> <span class="token punctuation">(</span><span class="token keyword">node</span><span class="token operator">:</span><span class="token class-name">Movie</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">WHERE</span> <span class="token keyword">node</span><span class="token punctuation">.</span>title <span class="token operator">=~</span> <span class="token string">'Apollo.*'</span> <span class="token keyword">AND</span> <span class="token keyword">node</span><span class="token punctuation">.</span>released <span class="token operator"><</span> <span class="token number">1996</span>
|
||
</span><span class="code-line"><span class="token keyword">RETURN</span> <span class="token keyword">node</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="排序分页"><a aria-hidden="true" tabindex="-1" href="#排序分页"><span class="icon icon-link"></span></a>排序&分页</h3><div class="wrap-body">
|
||
<p>以电影名字排序，每一网页只显示10部电影，下面的查询返回了第三页（21~30项）。</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">match</span> <span class="token punctuation">(</span>alice<span class="token operator">:</span><span class="token class-name">Person</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">'Alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span>HAS_SEEN<span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span>movie<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">return</span> movie
|
||
</span><span class="code-line"><span class="token keyword">order</span> <span class="token keyword">by</span> movie<span class="token punctuation">.</span>name
|
||
</span><span class="code-line"><span class="token keyword">skip</span> <span class="token number">20</span>
|
||
</span><span class="code-line"><span class="token keyword">limit</span> <span class="token number">10</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="聚合函数"><a aria-hidden="true" tabindex="-1" href="#聚合函数"><span class="icon icon-link"></span></a>聚合函数</h3><div class="wrap-body">
|
||
<p>计算每一部电影被观看的数量，按数量排序</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">match</span> <span class="token punctuation">(</span><span class="token keyword">node</span><span class="token operator">:</span><span class="token class-name">Movie</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">HAS_BEEN_SEEN</span><span class="token punctuation">]</span><span class="token operator">-></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">return</span> <span class="token keyword">node</span><span class="token punctuation">,</span><span class="token function">count</span><span class="token punctuation">(</span><span class="token operator">*</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token function">count</span><span class="token punctuation">(</span><span class="token operator">*</span><span class="token punctuation">)</span> <span class="token keyword">desc</span><span class="token punctuation">;</span>
|
||
</span></code></pre>
|
||
<p>要求<code>John</code>所有朋友的平均年龄，可以使用以下查询</p>
|
||
<pre class="language-cypher"><code class="language-cypher code-highlight"><span class="code-line"><span class="token keyword">match</span> <span class="token punctuation">(</span><span class="token keyword">node</span><span class="token operator">:</span><span class="token class-name">users</span><span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token string">"John Johnson"</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token punctuation">[</span><span class="token operator">:</span><span class="token relationship property">IS_FRIEND_OF</span><span class="token punctuation">]</span><span class="token operator">-</span><span class="token punctuation">(</span>friend<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">where</span> <span class="token function">HAS</span><span class="token punctuation">(</span>friend<span class="token punctuation">.</span>yearOfBirth<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">return</span> <span class="token function">avg</span><span class="token punctuation">(</span><span class="token number">2014</span><span class="token operator">-</span>friend<span class="token punctuation">.</span>yearOfBirth<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
</span></code></pre>
|
||
</div></div></div></div></div></div><script src="https://giscus.app/client.js" data-repo="jaywcjlove/reference" data-repo-id="R_kgDOID2-Mw" data-category="Q&A" data-category-id="DIC_kwDOID2-M84CS5wo" data-mapping="pathname" data-strict="0" data-reactions-enabled="1" data-emit-metadata="0" data-input-position="bottom" data-theme="dark" data-lang="zh-CN" crossorigin="anonymous" async></script><div class="giscus"></div></div><footer class="footer-wrap"><footer class="max-container">© 2022 <a href="https://wangchujiang.com/#/app" target="_blank">Kenny Wang</a>.</footer></footer><script src="../data.js?v=1.5.3" defer></script><script src="../js/fuse.min.js?v=1.5.3" defer></script><script src="../js/main.js?v=1.5.3" defer></script><div id="mysearch"><div class="mysearch-box"><div class="mysearch-input"><div><svg xmlns="http://www.w3.org/2000/svg" height="1em" width="1em" viewBox="0 0 18 18">
|
||
<path fill="currentColor" d="M17.71,16.29 L14.31,12.9 C15.4069846,11.5024547 16.0022094,9.77665502 16,8 C16,3.581722 12.418278,0 8,0 C3.581722,0 0,3.581722 0,8 C0,12.418278 3.581722,16 8,16 C9.77665502,16.0022094 11.5024547,15.4069846 12.9,14.31 L16.29,17.71 C16.4777666,17.8993127 16.7333625,18.0057983 17,18.0057983 C17.2666375,18.0057983 17.5222334,17.8993127 17.71,17.71 C17.8993127,17.5222334 18.0057983,17.2666375 18.0057983,17 C18.0057983,16.7333625 17.8993127,16.4777666 17.71,16.29 Z M2,8 C2,4.6862915 4.6862915,2 8,2 C11.3137085,2 14,4.6862915 14,8 C14,11.3137085 11.3137085,14 8,14 C4.6862915,14 2,11.3137085 2,8 Z"></path>
|
||
</svg><input id="mysearch-input" type="search" placeholder="搜索" autocomplete="off"><div class="mysearch-clear"></div></div><button id="mysearch-close" type="button">搜索</button></div><div class="mysearch-result"><div id="mysearch-menu"></div><div id="mysearch-content"></div></div></div></div></body>
|
||
</html>
|