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  <div class="section" id="linsert">
<span id="id1"></span><h1>LINSERT<a class="headerlink" href="#linsert" title="Permalink to this headline">¶</a></h1>
<p><strong>LINSERT key BEFORE|AFTER pivot value</strong></p>
<p>将值 <code class="docutils literal"><span class="pre">value</span></code> 插入到列表 <code class="docutils literal"><span class="pre">key</span></code> 当中，位于值 <code class="docutils literal"><span class="pre">pivot</span></code> 之前或之后。</p>
<p>当 <code class="docutils literal"><span class="pre">pivot</span></code> 不存在于列表 <code class="docutils literal"><span class="pre">key</span></code> 时，不执行任何操作。</p>
<p>当 <code class="docutils literal"><span class="pre">key</span></code> 不存在时， <code class="docutils literal"><span class="pre">key</span></code> 被视为空列表，不执行任何操作。</p>
<p>如果 <code class="docutils literal"><span class="pre">key</span></code> 不是列表类型，返回一个错误。</p>
<dl class="docutils">
<dt><strong>可用版本：</strong></dt>
<dd>&gt;= 2.2.0</dd>
<dt><strong>时间复杂度:</strong></dt>
<dd>O(N)， <code class="docutils literal"><span class="pre">N</span></code> 为寻找 <code class="docutils literal"><span class="pre">pivot</span></code> 过程中经过的元素数量。</dd>
<dt><strong>返回值:</strong></dt>
<dd><div class="first last line-block">
<div class="line">如果命令执行成功，返回插入操作完成之后，列表的长度。</div>
<div class="line">如果没有找到 <code class="docutils literal"><span class="pre">pivot</span></code> ，返回 <code class="docutils literal"><span class="pre">-1</span></code> 。</div>
<div class="line">如果 <code class="docutils literal"><span class="pre">key</span></code> 不存在或为空列表，返回 <code class="docutils literal"><span class="pre">0</span></code> 。</div>
</div>
</dd>
</dl>
<div class="highlight-python"><div class="highlight"><pre>redis&gt; RPUSH mylist &quot;Hello&quot;
(integer) 1

redis&gt; RPUSH mylist &quot;World&quot;
(integer) 2

redis&gt; LINSERT mylist BEFORE &quot;World&quot; &quot;There&quot;
(integer) 3

redis&gt; LRANGE mylist 0 -1
1) &quot;Hello&quot;
2) &quot;There&quot;
3) &quot;World&quot;


# 对一个非空列表插入，查找一个不存在的 pivot

redis&gt; LINSERT mylist BEFORE &quot;go&quot; &quot;let&#39;s&quot;
(integer) -1                                    # 失败


# 对一个空列表执行 LINSERT 命令

redis&gt; EXISTS fake_list
(integer) 0

redis&gt; LINSERT fake_list BEFORE &quot;nono&quot; &quot;gogogog&quot;
(integer) 0                                      # 失败
</pre></div>
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