我等采石之人，当心怀建造大教堂之愿景。 https://wiki.fanfou.dev/ Wed, 06 May 2026 17:18:52 +0000 FeedCreator 1.8 https://wiki.fanfou.dev/lib/exe/fetch.php/wiki:dokuwiki.svg https://wiki.fanfou.dev/ https://wiki.fanfou.dev/doku.php/db:mongodb <h1 class="sectionedit1" id="mongodb-shell-command">MongoDB Shell Command</h1> <div class="level1"> <pre class="code sql"><span class="co1">-- 查询字段不存在</span> db<span class="sy0">.</span>collection<span class="sy0">.</span>find<span class="br0">&#40;</span><span class="br0">&#123;</span><span class="st0">&quot;field&quot;</span>:<span class="br0">&#123;</span>$exists:<span class="kw1">FALSE</span><span class="br0">&#125;</span><span class="br0">&#125;</span><span class="br0">&#41;</span>; <span class="co1">-- 查询字段存在</span> db<span class="sy0">.</span>collection<span class="sy0">.</span>find<span class="br0">&#40;</span><span class="br0">&#123;</span><span class="st0">&quot;field&quot;</span>:<span class="br0">&#123;</span>$exists:<span class="kw1">TRUE</span><span class="br0">&#125;</span><span class="br0">&#125;</span><span class="br0">&#41;</span>; <span class="co1">-- 删除字段 Docs</span> db<span class="sy0">.</span>collection<span class="sy0">.</span>updateMany<span class="br0">&#40;</span><span class="br0">&#123;</span><span class="st0">&quot;field&quot;</span>:<span class="br0">&#123;</span>$exists:<span class="kw1">TRUE</span><span class="br0">&#125;</span><span class="br0">&#125;</span><span class="sy0">,</span><span class="br0">&#123;</span>$unset:<span class="br0">&#123;</span><span class="st0">&quot;field&quot;</span>:<span class="nu0">1</span><span class="br0">&#125;</span><span class="br0">&#125;</span><span class="br0">&#41;</span>;</pre> </div> anonymous@undisclosed.example.com (Anonymous) Wed, 23 Dec 2020 00:44:33 +0000