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<h2 class="post-title" itemprop="name headline">mongo 设置自动过期时间</h2>
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<p>Time To Live(TTL) 集合</p>
<p>MongoDB 2.2 引入一个新特性–TTL 集合，TTL集合支持失效时间设置，或者在某个特定时间，<br>集合自动清除超时文档，者用来保存一个诸如session会话信息的时候非常有用。</p>
<p>如果想使用TTL集合，用用到 expireAfterSeconds 选项</p>
<a id="more"></a>
<h3 id="Expire-Documents-after-a-Specified-Number-of-Seconds"><a href="#Expire-Documents-after-a-Specified-Number-of-Seconds" class="headerlink" title="Expire Documents after a Specified Number of Seconds"></a>Expire Documents after a Specified Number of Seconds</h3><p>首先创建索引，设置过期时间</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">db.log_events.createIndex( { "createdAt": 1 }, { expireAfterSeconds: 3600 } )</span><br></pre></td></tr></table></figure>
<p>然后存储数据入库</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">db.log_events.insert( {</span><br><span class="line"> "createdAt": new Date(),</span><br><span class="line"> "logEvent": 2,</span><br><span class="line"> "logMessage": "Success!"</span><br><span class="line">} )</span><br></pre></td></tr></table></figure>
<p>golang 使用mgo实现：</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">CreateIndex</span><span class="params">()</span> <span class="params">(err error)</span></span> {</span><br><span class="line"> db := datasource.NewSessionStore()</span><br><span class="line"> <span class="keyword">defer</span> db.Close()</span><br><span class="line"> col := db.C(log_events)</span><br><span class="line"> <span class="comment">// Index</span></span><br><span class="line"> index := mgo.Index{</span><br><span class="line"> Key: []<span class="keyword">string</span>{<span class="string">"createdAt"</span>},</span><br><span class="line"> ExpireAfter: time.Second * <span class="number">3600</span>,</span><br><span class="line"> }</span><br><span class="line"> err = col.EnsureIndex(index)</span><br><span class="line"> <span class="keyword">return</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="Expire-Documents-at-a-Specific-Clock-Time"><a href="#Expire-Documents-at-a-Specific-Clock-Time" class="headerlink" title="Expire Documents at a Specific Clock Time"></a>Expire Documents at a Specific Clock Time</h3><p>与上面的设置类似<br>首先建立索引，设置 expireAfterSeconds 为 0</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">db.log_events.createIndex( { "expireAt": 1 }, { expireAfterSeconds: 0 } )</span><br></pre></td></tr></table></figure>
<p>然后存储数据</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">db.log_events.insert( {</span><br><span class="line"> "expireAt": new Date('July 22, 2013 14:00:00'),</span><br><span class="line"> "logEvent": 2,</span><br><span class="line"> "logMessage": "Success!"</span><br><span class="line">} )</span><br></pre></td></tr></table></figure>
<p>expireAt 的值为特定的时间值，等时间到达expireAt的值时，这个文档就失效了。<br>mgo里面好像没办法创建这种索引了</p>
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