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<div class="section" id="rename-key-newkey">
<span id="rename"></span><h1>RENAME key newkey<a class="headerlink" href="#rename-key-newkey" title="Permalink to this headline">¶</a></h1>
<blockquote>
<div><div class="line-block">
<div class="line">可用版本： >= 1.0.0</div>
<div class="line">时间复杂度： O(1)</div>
</div>
</div></blockquote>
<p>将 <code class="docutils literal"><span class="pre">key</span></code> 改名为 <code class="docutils literal"><span class="pre">newkey</span></code> 。</p>
<p>当 <code class="docutils literal"><span class="pre">key</span></code> 和 <code class="docutils literal"><span class="pre">newkey</span></code> 相同，或者 <code class="docutils literal"><span class="pre">key</span></code> 不存在时，返回一个错误。</p>
<p>当 <code class="docutils literal"><span class="pre">newkey</span></code> 已经存在时， <a class="reference internal" href="#rename">RENAME</a> 命令将覆盖旧值。</p>
<div class="section" id="id1">
<h2>返回值<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<p>改名成功时提示 <code class="docutils literal"><span class="pre">OK</span></code> ，失败时候返回一个错误。</p>
</div>
<div class="section" id="id2">
<h2>代码示例<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># key 存在且 newkey 不存在</span>
<span class="n">redis</span><span class="o">></span> <span class="n">SET</span> <span class="n">message</span> <span class="s2">"hello world"</span>
<span class="n">OK</span>
<span class="n">redis</span><span class="o">></span> <span class="n">RENAME</span> <span class="n">message</span> <span class="n">greeting</span>
<span class="n">OK</span>
<span class="n">redis</span><span class="o">></span> <span class="n">EXISTS</span> <span class="n">message</span> <span class="c1"># message 不复存在</span>
<span class="p">(</span><span class="n">integer</span><span class="p">)</span> <span class="mi">0</span>
<span class="n">redis</span><span class="o">></span> <span class="n">EXISTS</span> <span class="n">greeting</span> <span class="c1"># greeting 取而代之</span>
<span class="p">(</span><span class="n">integer</span><span class="p">)</span> <span class="mi">1</span>
<span class="c1"># 当 key 不存在时，返回错误</span>
<span class="n">redis</span><span class="o">></span> <span class="n">RENAME</span> <span class="n">fake_key</span> <span class="n">never_exists</span>
<span class="p">(</span><span class="n">error</span><span class="p">)</span> <span class="n">ERR</span> <span class="n">no</span> <span class="n">such</span> <span class="n">key</span>
<span class="c1"># newkey 已存在时， RENAME 会覆盖旧 newkey</span>
<span class="n">redis</span><span class="o">></span> <span class="n">SET</span> <span class="n">pc</span> <span class="s2">"lenovo"</span>
<span class="n">OK</span>
<span class="n">redis</span><span class="o">></span> <span class="n">SET</span> <span class="n">personal_computer</span> <span class="s2">"dell"</span>
<span class="n">OK</span>
<span class="n">redis</span><span class="o">></span> <span class="n">RENAME</span> <span class="n">pc</span> <span class="n">personal_computer</span>
<span class="n">OK</span>
<span class="n">redis</span><span class="o">></span> <span class="n">GET</span> <span class="n">pc</span>
<span class="p">(</span><span class="n">nil</span><span class="p">)</span>
<span class="n">redis</span><span class="p">:</span><span class="mi">1</span><span class="o">></span> <span class="n">GET</span> <span class="n">personal_computer</span> <span class="c1"># 原来的值 dell 被覆盖了</span>
<span class="s2">"lenovo"</span>
</pre></div>
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