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<!DOCTYPE html>
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<div class="section" id="unwatch">
<span id="id1"></span><h1>UNWATCH<a class="headerlink" href="#unwatch" title="Permalink to this headline">¶</a></h1>
<p><strong>UNWATCH</strong></p>
<p>取消 <a class="reference internal" href="watch.html#watch"><span class="std std-ref">WATCH</span></a> 命令对所有 key 的监视。</p>
<p>如果在执行 <a class="reference internal" href="watch.html#watch"><span class="std std-ref">WATCH</span></a> 命令之后， <a class="reference internal" href="exec.html#exec"><span class="std std-ref">EXEC</span></a> 命令或 <a class="reference internal" href="discard.html#discard"><span class="std std-ref">DISCARD</span></a> 命令先被执行了的话，那么就不需要再执行 <a class="reference internal" href="#unwatch">UNWATCH</a> 了。</p>
<p>因为 <a class="reference internal" href="exec.html#exec"><span class="std std-ref">EXEC</span></a> 命令会执行事务，因此 <a class="reference internal" href="watch.html#watch"><span class="std std-ref">WATCH</span></a> 命令的效果已经产生了；而 <a class="reference internal" href="discard.html#discard"><span class="std std-ref">DISCARD</span></a> 命令在取消事务的同时也会取消所有对 key 的监视，因此这两个命令执行之后，就没有必要执行 <a class="reference internal" href="#unwatch">UNWATCH</a> 了。</p>
<dl class="simple">
<dt><strong>可用版本：</strong></dt><dd><p>>= 2.2.0</p>
</dd>
<dt><strong>时间复杂度：</strong></dt><dd><p>O(1)</p>
</dd>
<dt><strong>返回值：</strong></dt><dd><p>总是 <code class="docutils literal notranslate"><span class="pre">OK</span></code> 。</p>
</dd>
</dl>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">redis</span><span class="o">></span> <span class="n">WATCH</span> <span class="n">lock</span> <span class="n">lock_times</span>
<span class="n">OK</span>
<span class="n">redis</span><span class="o">></span> <span class="n">UNWATCH</span>
<span class="n">OK</span>
</pre></div>
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