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<div class="section" id="msetnx-key-value-key-value">
<span id="msetnx"></span><h1>MSETNX key value [key value …]<a class="headerlink" href="#msetnx-key-value-key-value" title="Permalink to this headline">¶</a></h1>
<blockquote>
<div><div class="line-block">
<div class="line">可用版本： >= 1.0.1</div>
<div class="line">时间复杂度： O(N)， 其中 N 为被设置的键数量。</div>
</div>
</div></blockquote>
<p>当且仅当所有给定键都不存在时，
为所有给定键设置值。</p>
<p>即使只有一个给定键已经存在，
<code class="docutils literal notranslate"><span class="pre">MSETNX</span></code> 命令也会拒绝执行对所有键的设置操作。</p>
<p><code class="docutils literal notranslate"><span class="pre">MSETNX</span></code> 是一个原子性(atomic)操作，
所有给定键要么就全部都被设置，
要么就全部都不设置，
不可能出现第三种状态。</p>
<div class="section" id="id1">
<h2>返回值<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<p>当所有给定键都设置成功时，
命令返回 <code class="docutils literal notranslate"><span class="pre">1</span></code> ；
如果因为某个给定键已经存在而导致设置未能成功执行，
那么命令返回 <code class="docutils literal notranslate"><span class="pre">0</span></code> 。</p>
</div>
<div class="section" id="id2">
<h2>代码示例<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
<p>对不存在的键执行 <code class="docutils literal notranslate"><span class="pre">MSETNX</span></code> 命令：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">redis</span><span class="o">></span> <span class="n">MSETNX</span> <span class="n">rmdbs</span> <span class="s2">"MySQL"</span> <span class="n">nosql</span> <span class="s2">"MongoDB"</span> <span class="n">key</span><span class="o">-</span><span class="n">value</span><span class="o">-</span><span class="n">store</span> <span class="s2">"redis"</span>
<span class="p">(</span><span class="n">integer</span><span class="p">)</span> <span class="mi">1</span>
<span class="n">redis</span><span class="o">></span> <span class="n">MGET</span> <span class="n">rmdbs</span> <span class="n">nosql</span> <span class="n">key</span><span class="o">-</span><span class="n">value</span><span class="o">-</span><span class="n">store</span>
<span class="mi">1</span><span class="p">)</span> <span class="s2">"MySQL"</span>
<span class="mi">2</span><span class="p">)</span> <span class="s2">"MongoDB"</span>
<span class="mi">3</span><span class="p">)</span> <span class="s2">"redis"</span>
</pre></div>
</div>
<p>对某个已经存在的键进行设置：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">redis</span><span class="o">></span> <span class="n">MSETNX</span> <span class="n">rmdbs</span> <span class="s2">"Sqlite"</span> <span class="n">language</span> <span class="s2">"python"</span> <span class="c1"># rmdbs 键已经存在，操作失败</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">language</span> <span class="c1"># 因为 MSETNX 命令没有成功执行</span>
<span class="p">(</span><span class="n">integer</span><span class="p">)</span> <span class="mi">0</span> <span class="c1"># 所以 language 键没有被设置</span>
<span class="n">redis</span><span class="o">></span> <span class="n">GET</span> <span class="n">rmdbs</span> <span class="c1"># rmdbs 键也没有被修改</span>
<span class="s2">"MySQL"</span>
</pre></div>
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