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reference/docs/Neo4j.html
jaywcjlove 4c70684e7f fet: add docs/Neo4j.md (#636) 
* 新增了c#中的类（所有内容都是经过书籍，资料证实的）

* 新增了c#中的类部分模块，元组模块，集合模块

* 更改了c#中集合的样式，之前显示出来有bug

* 新增了Neo4j模块

* 新增了Neo4j模块 f6a29c9e9e
2024-05-05 08:47:01 +00:00

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<title>&#x3C;!--rehype:class &#x26; Neo4j cheatsheet &#x26; Quick Reference</title>
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Neo4这个 neo4j 快速参考备忘单显示了它的常用命令，为开发人员分享快速参考备忘单。">
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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>
</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安装">Neo4J安装</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="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="#增加修改节点的属性">增加/修改节点的属性</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-not-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">
<p>首先在 <a href="https://link.zhihu.com/?target=https%3A//neo4j.com/download/">https://neo4j.com/download/</a> 下载Neo4J。Neo4J分为社区版和企业版，企业版在横向扩展、权限控制、运行性能、HA等方面都比社区版好，适合正式的生产环境，普通的学习和开发采用免费社区版就好。</p>
<p>在Mac或者Linux中，安装好jdk后，直接解压下载好的Neo4J包，运行<code>bin/neo4j start</code>即可</p>
</div></div></div><div class="wrap h3body-not-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>
<p>打开浏览器，输入<code>http://127.0.0.1:7474/browser/</code>，可以进入管理页面</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-text"><code class="language-text code-highlight"><span class="code-line">CREATE (n:Person {name:'Sally'}) RETURN n;
</span><span class="code-line">CREATE (n:Person {name:'Steve'}) RETURN n;
</span></code></pre>
<p>创建‘FRIENDS’关系</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Person {name:'Sally'}),
</span><span class="code-line"> (b:Person {name:'Steve'})
</span><span class="code-line">MERGE (a)-[:FRIENDS]->(b)
</span></code></pre>
<p>创建节点的时候就建好‘FRIENDS’关系</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">CREATE (a:Person {name:'Todd'})-[r:FRIENDS]->(b:Person {name:'Carlos'})
</span></code></pre>
<p>为创建完成的关系增加‘since’属性</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Person {name:'Sally'}),
</span><span class="code-line"> (b:Person {name:'Steve'})
</span><span class="code-line">MERGE (a)-[:FRIENDS {since:2001}]->(b)
</span></code></pre>
</div></div></div><div class="wrap h3body-not-exist"><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">
<p>删除所有节点</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (n) DETACH DELETE n
</span></code></pre>
<p>删除‘Person’中‘name‘为’Mike‘节点的’test‘属性</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Person {name:'Mike'}) SET a.test='test'
</span><span class="code-line">MATCH (a:Person {name:'Mike'}) REMOVE a.test
</span></code></pre>
<p>删除’Location‘中’city‘为’Portland‘的节点</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Location {city:'Portland'}) DELETE 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-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Person {name:'Todd'})-[rel]-(b:Person) DELETE a,b,rel
</span></code></pre>
</div></div></div><div class="wrap h3body-not-exist"><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">
<p>查询所有在Boston出生的人物</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Person)-[:BORN_IN]->(b:Location {city:'Boston'}) RETURN a,b
</span></code></pre>
<p>查询所有对外有关系的节点</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a)-->() RETURN a
</span></code></pre>
<p>查询所有有关系的节点</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a)--() RETURN 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-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a)-[r]->() RETURN a.name, type(r)
</span></code></pre>
<p>查询所有有结婚关系的节点</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (n)-[:MARRIED]-() RETURN n
</span></code></pre>
<p>查找某人的朋友的朋友</p>
<pre class="language-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Person {name:'Mike'})-[r1:FRIENDS]-()-[r2:FRIENDS]-(friend_of_a_friend) RETURN friend_of_a_friend.name AS fofName
</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-text"><code class="language-text code-highlight"><span class="code-line">MATCH (a:Person {name:'Liz'}) SET a.age=34
</span><span class="code-line">MATCH (a:Person {name:'Shawn'}) SET a.age=32
</span><span class="code-line">MATCH (a:Person {name:'John'}) SET a.age=44
</span><span class="code-line">MATCH (a:Person {name:'Mike'}) SET a.age=25
</span></code></pre>
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