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id="post-info"><h1 class="post-title">MongoDB的命令详解</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2019-03-09T03:07:23.000Z" title="发表于 2019-03-09 11:07:23">2019-03-09</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2024-03-18T02:51:00.712Z" title="更新于 2024-03-18 10:51:00">2024-03-18</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="categories/Linux/">Linux</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="categories/Linux/MongoDB/">MongoDB</a><i class="fas 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id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="MongoDB指令"><a href="#MongoDB指令" class="headerlink" title="MongoDB指令"></a>MongoDB指令</h1><ol>
<li><p>清屏</p>
<figure class="highlight abnf"><table><tr><td class="code"><pre><span class="line">cls<span class="comment">;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>查看数据库<br>查看当前使用数据库名称</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">show dbs;</span><br><span class="line">db;</span><br></pre></td></tr></table></figure>
</li>
<li><p>查看集合</p>
<figure class="highlight abnf"><table><tr><td class="code"><pre><span class="line">show collections<span class="comment">;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>进入某个集合</p>
<figure class="highlight abnf"><table><tr><td class="code"><pre><span class="line">use (collections)<span class="comment">;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>查询集合中的数据<br>查询某个数据库用户</p>
<figure class="highlight routeros"><table><tr><td class="code"><pre><span class="line">db.(collections).<span class="built_in">find</span>({条件});</span><br><span class="line">db.users.<span class="built_in">find</span>();</span><br></pre></td></tr></table></figure>
</li>
<li><p>添加数据</p>
<figure class="highlight scss"><table><tr><td class="code"><pre><span class="line">db.(collections)<span class="selector-class">.save</span>({对象})</span><br><span class="line">#也可用于更新于已存在的集合，但是不推荐</span><br><span class="line">db.(collections)<span class="selector-class">.save</span>({_id:"已存在的id",对象})</span><br><span class="line">#这种插入_id唯一</span><br><span class="line">db.(collections)<span class="selector-class">.insert</span>({对象})</span><br></pre></td></tr></table></figure>
</li>
<li><p>更新数据</p>
<figure class="highlight shell"><table><tr><td class="code"><pre><span class="line">db.(collections).update({需要修改对象},{对象修改的内容},{upsert,multi,writeConcern})</span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">需要修改的对象 可以用模糊匹配</span></span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">对象修改的内容 如果默认写入对象则覆盖原对象,如果需要增添或者修改则使用{<span class="variable">$set</span> : {对象修改的内容}}</span></span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">upsert : 可选，这个参数的意思是，如果不存在update的记录，是否插入objNew,<span class="literal">true</span>为插入，默认是<span class="literal">false</span>，不插入。</span></span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">multi : 可选，mongodb 默认是<span class="literal">false</span>,只更新找到的第一条记录，如果这个参数为<span class="literal">true</span>,就把按条件查出来多条记录全部更新。</span></span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">writeConcern :可选，抛出异常的级别。</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>删除数据</p>
<figure class="highlight gcode"><table><tr><td class="code"><pre><span class="line">db.<span class="comment">(collections)</span>.remove<span class="comment">({删除的对象})</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>聚合函数</p>
<p>需求当前集合的记录数</p>
<figure class="highlight scss"><table><tr><td class="code"><pre><span class="line">db.(collections)<span class="selector-class">.find</span>()<span class="selector-class">.count</span>();</span><br></pre></td></tr></table></figure>
<p>求最大值</p>
<p>求整个集合的总成绩</p>
<figure class="highlight handlebars"><table><tr><td class="code"><pre><span class="line"><span class="language-xml">db.(collections).aggregate(</span><span class="template-variable">{{<span class="name">_id:</span><span class="string">'1'</span>,sumscore:{$sum:<span class="string">'$score'</span>}}</span><span class="language-xml">})</span></span><br><span class="line"><span class="language-xml">#_id一定作为分组名</span></span><br><span class="line"><span class="language-xml">#$avg</span></span><br></pre></td></tr></table></figure>
</li>
</ol>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://www.scery.com">HaoDong Wu</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://www.scery.com/MongoDB%E6%8C%87%E4%BB%A4.htm">https://www.scery.com/MongoDB%E6%8C%87%E4%BB%A4.htm</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://www.scery.com" target="_blank">Anthony's Blog</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="tags/Linux/">Linux</a><a class="post-meta__tags" href="tags/Services/">Services</a><a class="post-meta__tags" 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