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<div class="section" id="hkeys">
<span id="id1"></span><h1>HKEYS<a class="headerlink" href="#hkeys" title="Permalink to this headline">¶</a></h1>
<p><strong>HKEYS key</strong></p>
<p>返回哈希表 <code class="docutils literal notranslate"><span class="pre">key</span></code> 中的所有域。</p>
<dl>
<dt><strong>可用版本：</strong></dt><dd><p>>= 2.0.0</p>
</dd>
<dt><strong>时间复杂度：</strong></dt><dd><p>O(N)， <code class="docutils literal notranslate"><span class="pre">N</span></code> 为哈希表的大小。</p>
</dd>
<dt><strong>返回值：</strong></dt><dd><div class="line-block">
<div class="line">一个包含哈希表中所有域的表。</div>
<div class="line">当 <code class="docutils literal notranslate"><span class="pre">key</span></code> 不存在时，返回一个空表。</div>
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</dd>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># 哈希表非空</span>
<span class="n">redis</span><span class="o">></span> <span class="n">HMSET</span> <span class="n">website</span> <span class="n">google</span> <span class="n">www</span><span class="o">.</span><span class="n">google</span><span class="o">.</span><span class="n">com</span> <span class="n">yahoo</span> <span class="n">www</span><span class="o">.</span><span class="n">yahoo</span><span class="o">.</span><span class="n">com</span>
<span class="n">OK</span>
<span class="n">redis</span><span class="o">></span> <span class="n">HKEYS</span> <span class="n">website</span>
<span class="mi">1</span><span class="p">)</span> <span class="s2">"google"</span>
<span class="mi">2</span><span class="p">)</span> <span class="s2">"yahoo"</span>
<span class="c1"># 空哈希表/key不存在</span>
<span class="n">redis</span><span class="o">></span> <span class="n">EXISTS</span> <span class="n">fake_key</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">HKEYS</span> <span class="n">fake_key</span>
<span class="p">(</span><span class="n">empty</span> <span class="nb">list</span> <span class="ow">or</span> <span class="nb">set</span><span class="p">)</span>
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