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| <title>HSTRLEN — Redis 命令参考</title> | ||
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| <div class="section" id="hstrlen"> | ||
| <span id="id1"></span><h1>HSTRLEN<a class="headerlink" href="#hstrlen" title="Permalink to this headline">¶</a></h1> | ||
| <p><strong>HSTRLEN key field</strong></p> | ||
| <p>返回哈希表 <code class="docutils literal"><span class="pre">key</span></code> 中， | ||
| 与给定域 <code class="docutils literal"><span class="pre">field</span></code> 相关联的值的字符串长度（string length）。</p> | ||
| <p>如果给定的键或者域不存在， | ||
| 那么命令返回 <code class="docutils literal"><span class="pre">0</span></code> 。</p> | ||
| <dl class="docutils"> | ||
| <dt><strong>可用版本：</strong></dt> | ||
| <dd>>= 3.2.0</dd> | ||
| <dt><strong>时间复杂度：</strong></dt> | ||
| <dd>O(1)</dd> | ||
| <dt><strong>返回值：</strong></dt> | ||
| <dd>一个整数。</dd> | ||
| </dl> | ||
| <div class="highlight-python"><div class="highlight"><pre>redis> HMSET myhash f1 "HelloWorld" f2 "99" f3 "-256" | ||
| OK | ||
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| redis> HSTRLEN myhash f1 | ||
| (integer) 10 | ||
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| redis> HSTRLEN myhash f2 | ||
| (integer) 2 | ||
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| redis> HSTRLEN myhash f3 | ||
| (integer) 4 | ||
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