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<title>RPUSHX — Redis 命令参考</title>
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<span id="id1"></span><h1>RPUSHX<a class="headerlink" href="#rpushx" title="Permalink to this headline">¶</a></h1>
<p><strong>RPUSHX key 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> 的表尾，当且仅当 <code class="docutils literal"><span class="pre">key</span></code> 存在并且是一个列表。</p>
<p>和 <a class="reference internal" href="rpush.html#rpush"><span>RPUSH</span></a> 命令相反，当 <code class="docutils literal"><span class="pre">key</span></code> 不存在时， <a class="reference internal" href="#rpushx">RPUSHX</a> 命令什么也不做。</p>
<dl class="docutils">
<dt><strong>可用版本：</strong></dt>
<dd>>= 2.2.0</dd>
<dt><strong>时间复杂度：</strong></dt>
<dd>O(1)</dd>
<dt><strong>返回值：</strong></dt>
<dd><a class="reference internal" href="#rpushx">RPUSHX</a> 命令执行之后，表的长度。</dd>
</dl>
<div class="highlight-python"><div class="highlight"><pre># key不存在
redis> LLEN greet
(integer) 0
redis> RPUSHX greet "hello" # 对不存在的 key 进行 RPUSHX，PUSH 失败。
(integer) 0
# key 存在且是一个非空列表
redis> RPUSH greet "hi" # 先用 RPUSH 插入一个元素
(integer) 1
redis> RPUSHX greet "hello" # greet 现在是一个列表类型，RPUSHX 操作成功。
(integer) 2
redis> LRANGE greet 0 -1
1) "hi"
2) "hello"
</pre></div>
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