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<title>Neo4j 备忘清单
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& neo4j cheatsheet & Quick Reference</title>
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<meta description="Neo4这个 neo4j 快速参考备忘单显示了它的常用命令
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入门，为开发人员分享快速参考备忘单。">
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</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">
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<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>
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</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">
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</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-安装">Neo4J 安装</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="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">
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</div></div><div class="h2wrap-body"><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="neo4j-安装"><a aria-hidden="true" tabindex="-1" href="#neo4j-安装"><span class="icon icon-link"></span></a>Neo4J 安装</h3><div class="wrap-body">
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<p>当开始使用 Neo4j 时，首先需要从<a href="https://neo4j.com/download/">官网下载页面</a>下载 Neo4j。Neo4j 分为社区版和企业版。尽管企业版在横向扩展、权限控制、运行性能和高可用性等方面更优秀，适合正式的生产环境，但对于普通的学习和开发，免费的社区版就足够了。</p>
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<h4 id="运行"><a aria-hidden="true" tabindex="-1" href="#运行"><span class="icon icon-link"></span></a>运行</h4>
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<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line">$ bin/neo4j start
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</span></code></pre>
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<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>
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</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">
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<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>
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<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>
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<p>打开浏览器，输入下面网址，可以进入管理页面</p>
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<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>
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</span></code></pre>
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</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">
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</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">
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<p>创建多个节点</p>
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<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>
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</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>
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</span></code></pre>
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<p>创建 <code>FRIENDS</code> 关系</p>
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<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>
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</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>
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</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>
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</span></code></pre>
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<p>创建节点的时候就建好 <code>FRIENDS</code> 关系</p>
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<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>
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</span></code></pre>
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<p>为创建完成的关系增加 <code>since</code> 属性</p>
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<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>
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</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>
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</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>
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</span></code></pre>
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</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">
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<!--rehype:wrap-class=col-span-2-->
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<p>删除所有节点</p>
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<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
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</span></code></pre>
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<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"><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-->
|
||
<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">
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<p>计算每一部电影被观看的数量，按数量排序</p>
|
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<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>
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</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>
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||
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