mongodb高级操作(2)-查询
find
mongodb
소개하다
작동하다
문서
질문
고급의
1.查询文档find介绍 mongodb中使用find来进行查询.find的第一个参数决定了要返回哪些文档,这个参数是一个文档,用于指定查询条件.如果不指定条件默认就是{},那么就是查询所有文档. db . test . find () { _id : ObjectId ( 573c858c323f7f2e2ccb0e17 ), name
1.查询文档find介绍
mongodb中使用find来进行查询.find的第一个参数决定了要返回哪些文档,这个参数是一个文档,用于指定查询条件. 如果不指定条件默认就是{},那么就是查询所有文档.<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">()</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c858c323f7f2e2ccb0e17"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">43</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"done"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c86d3017c5eb7d08aed6d"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">1</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"done"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c88fe017c5eb7d08aed6e"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"tom"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"done"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c8bd3323f7f2e2ccb0e18"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">30</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"done"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c858c323f7f2e2ccb0e17"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">43</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"done"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c8bd3323f7f2e2ccb0e18"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">30</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"done"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="lit" style="color:rgb(25,95,145)">43</span><span class="pun" style="color:rgb(147,161,161)">})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c858c323f7f2e2ccb0e17"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">43</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"done"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
指定返回的键
有时并不是需要返回所有的键,这时可以通过指定find或者findOne的第二个参数来指定想要的键,例如只想查询"name"为"brent"的name和age键: > db.test.find({"name":"brent"},{"name":1,"age":1})<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c858c323f7f2e2ccb0e17"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">43</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c8bd3323f7f2e2ccb0e18"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">30</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">},{</span><span class="str" style="color:rgb(221,17,68)">"<strong>status</strong>"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="lit" style="color:rgb(25,95,145)"><strong>0</strong></span><span class="pun" style="color:rgb(147,161,161)">})</span><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c858c323f7f2e2ccb0e17"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">43</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573c8bd3323f7f2e2ccb0e18"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">30</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">},{</span><span class="str" style="color:rgb(221,17,68)">"status"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="lit" style="color:rgb(25,95,145)">0</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="lit" style="color:rgb(25,95,145)">0</span><span class="pun" style="color:rgb(147,161,161)">})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">43</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">30</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
限制
查询传递的参数必须是常量,例如如果想查询一个文档中的某两个列相等的情况是不行的.2.查询条件
查询除了上面简单介绍的精确匹配,还有更加复杂的查询,比如范围查询,or,and,取反等等查询条件
"$lt","$lte","$gt","$gte"就是全部的比较操作符.分别对应着<,<=,>和>=,可以将这些组合起来以便查找一个范围的值. 例如下面的例子查找age大于20小于30的文档:<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test2</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">()</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e72449e178b5475b29d89"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">28</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73149e178b5475b29d8a"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73ae9e178b5475b29d8b"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">14</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test2</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pun" style="color:rgb(147,161,161)">:{</span><span class="str" style="color:rgb(221,17,68)">"$gt"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="lit" style="color:rgb(25,95,145)">20</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="str" style="color:rgb(221,17,68)">"$lt"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="lit" style="color:rgb(25,95,145)">30</span><span class="pun" style="color:rgb(147,161,161)">}})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e72449e178b5475b29d89"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">28</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test2</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pun" style="color:rgb(147,161,161)">:{</span><span class="str" style="color:rgb(221,17,68)">"$ne"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">}})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73ae9e178b5475b29d8b"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">14</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
OR查询
有两种方式进行OR查询:"$in"可以用来查询一个键的多个值,"$or"可以在多个键中查询任意给定的值. 例如下面要查询age为10,14的文档:<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test2</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pun" style="color:rgb(147,161,161)">:{</span><span class="str" style="color:rgb(221,17,68)">"$in"</span><span class="pun" style="color:rgb(147,161,161)">:[</span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="lit" style="color:rgb(25,95,145)">14</span><span class="pun" style="color:rgb(147,161,161)">]}})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73149e178b5475b29d8a"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73ae9e178b5475b29d8b"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">14</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test2</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pun" style="color:rgb(147,161,161)">:{</span><span class="str" style="color:rgb(221,17,68)">"$nin"</span><span class="pun" style="color:rgb(147,161,161)">:[</span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="lit" style="color:rgb(25,95,145)">14</span><span class="pun" style="color:rgb(147,161,161)">]}})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e72449e178b5475b29d89"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">28</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test2</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"$or"</span><span class="pun" style="color:rgb(147,161,161)">:[{</span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">},{</span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pun" style="color:rgb(147,161,161)">}]})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73149e178b5475b29d8a"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73ae9e178b5475b29d8b"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">14</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code>로그인 후 복사
<code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">></span><span class="pln" style="color:rgb(72,72,76)"> db</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">test2</span><span class="pun" style="color:rgb(147,161,161)">.</span><span class="pln" style="color:rgb(72,72,76)">find</span><span class="pun" style="color:rgb(147,161,161)">({</span><span class="str" style="color:rgb(221,17,68)">"$or"</span><span class="pun" style="color:rgb(147,161,161)">:[{</span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pun" style="color:rgb(147,161,161)">:{</span><span class="str" style="color:rgb(221,17,68)">"$in"</span><span class="pun" style="color:rgb(147,161,161)">:[</span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="lit" style="color:rgb(25,95,145)">28</span><span class="pun" style="color:rgb(147,161,161)">]}},{</span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">}]})</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e72449e178b5475b29d89"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">28</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73149e178b5475b29d8a"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"brent"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="lit" style="color:rgb(25,95,145)">10</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">}</span></code><code class="language-js" style="margin:8px 0px; font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace; word-wrap:break-word"><span class="pun" style="color:rgb(147,161,161)">{</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"_id"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="typ" style="color:teal">ObjectId</span><span class="pun" style="color:rgb(147,161,161)">(</span><span class="str" style="color:rgb(221,17,68)">"573e73ae9e178b5475b29d8b"</span><span class="pun" style="color:rgb(147,161,161)">),</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"name"</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="pun" style="color:rgb(147,161,161)">:</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"bob"</span><span class="pun" style="color:rgb(147,161,161)">,</span><span class="pln" style="color:rgb(72,72,76)"> </span><span class="str" style="color:rgb(221,17,68)">"age"</span><span class="pln" style="color:rgb(72"></span></code>로그인 후 복사
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mongodb에는 일반적으로 어떤 버전이 사용됩니까?
Apr 07, 2024 pm 05:48 PM
최신 기능과 개선 사항을 제공하는 최신 버전의 MongoDB(현재 5.0) 사용을 권장합니다. 버전을 선택할 때 기능 요구 사항, 호환성, 안정성 및 커뮤니티 지원을 고려해야 합니다. 예를 들어 최신 버전에는 트랜잭션 및 집계 파이프라인 최적화와 같은 기능이 있습니다. 버전이 애플리케이션과 호환되는지 확인하세요. 프로덕션 환경의 경우 장기 지원 버전을 선택하세요. 최신 버전에는 더욱 활발한 커뮤니티 지원이 포함되어 있습니다.
nodejs와 vuejs의 차이점
Apr 21, 2024 am 04:17 AM
Node.js는 서버측 JavaScript 런타임인 반면, Vue.js는 대화형 사용자 인터페이스를 생성하기 위한 클라이언트측 JavaScript 프레임워크입니다. Node.js는 백엔드 서비스 API 개발, 데이터 처리 등 서버 측 개발에 사용되고, Vue.js는 단일 페이지 애플리케이션, 반응형 사용자 인터페이스 등 클라이언트 측 개발에 사용됩니다.
mongodb가 생성한 데이터베이스는 어디에 있나요?
Apr 07, 2024 pm 05:39 PM
MongoDB 데이터베이스의 데이터는 로컬 파일 시스템, 네트워크 파일 시스템 또는 클라우드 스토리지에 있는 지정된 데이터 디렉터리에 저장됩니다. 구체적인 위치는 다음과 같습니다. 로컬 파일 시스템: 기본 경로는 Linux/macOS입니다. /데이터/db, Windows: C:\data\db. 네트워크 파일 시스템: 경로는 파일 시스템에 따라 다릅니다. 클라우드 스토리지: 경로는 클라우드 스토리지 제공업체에 의해 결정됩니다.
mongodb 데이터베이스의 장점은 무엇입니까?
Apr 07, 2024 pm 05:21 PM
MongoDB 데이터베이스는 유연성, 확장성 및 고성능으로 잘 알려져 있습니다. 그 장점은 다음과 같습니다: 데이터를 유연하고 구조화되지 않은 방식으로 저장할 수 있는 문서 데이터 모델입니다. 샤딩을 통해 여러 서버로 수평 확장이 가능합니다. 쿼리 유연성, 복잡한 쿼리 및 집계 작업을 지원합니다. 데이터 복제 및 내결함성은 데이터 중복성과 고가용성을 보장합니다. 프런트엔드 애플리케이션과의 손쉬운 통합을 위한 JSON 지원. 많은 양의 데이터를 처리하는 경우에도 빠른 응답을 위한 고성능입니다. 오픈 소스이며 사용자 정의가 가능하고 무료로 사용할 수 있습니다.
몽고디비는 무슨 뜻인가요?
Apr 07, 2024 pm 05:57 PM
MongoDB는 대량의 정형 및 비정형 데이터를 저장하고 관리하는 데 사용되는 문서 중심의 분산 데이터베이스 시스템입니다. 핵심 개념은 문서 저장 및 배포이며 주요 기능으로는 동적 스키마, 인덱싱, 집계, 맵 축소 및 복제가 있습니다. 콘텐츠 관리 시스템, 전자상거래 플랫폼, 소셜 미디어 웹사이트, IoT 애플리케이션, 모바일 애플리케이션 개발에 널리 사용됩니다.
몽고디비를 여는 방법
Apr 07, 2024 pm 06:15 PM
Linux/macOS: 데이터 디렉터리를 생성하고 "mongod" 서비스를 시작합니다. Windows의 경우: 데이터 디렉터리를 만들고 Service Manager에서 MongoDB 서비스를 시작합니다. Docker에서: "docker run" 명령을 실행하십시오. 다른 플랫폼: MongoDB 설명서를 참조하세요. 확인 방법: "mongo" 명령을 실행하여 연결하고 서버 버전을 확인하세요.
mongodb 데이터베이스 파일은 어디에 있나요?
Apr 07, 2024 pm 05:42 PM
MongoDB 데이터베이스 파일은 MongoDB 데이터 디렉터리에 위치하며 기본적으로 /data/db이며, 여기에는 .bson(문서 데이터), ns(수집 정보), Journal(쓰기 작업 기록), wiredTiger(WiredTiger 사용 시 데이터)가 포함됩니다. 스토리지 엔진) 및 config(데이터베이스 구성 정보) 및 기타 파일입니다.
Samsung S24ai 기능에 대한 자세한 소개
Jun 24, 2024 am 11:18 AM
2024년은 AI 휴대폰 원년이다. AI 스마트 기술을 탑재해 휴대폰을 더욱 효율적이고 편리하게 사용할 수 있는 휴대폰이 늘어나고 있다. 최근 연초 출시된 갤럭시 S24 시리즈에서는 제너레이티브 AI 경험이 다시 한 번 향상됐다. 자세한 기능 소개는 아래에서 살펴보자. 1. 생성적 AI의 강력한 강화 Samsung Galaxy S24 시리즈는 Galaxy AI의 강화를 통해 많은 지능형 애플리케이션을 제공했습니다. 이러한 기능은 Samsung One UI6.1과 긴밀하게 통합되어 사용자가 언제든지 편리하고 지능적인 경험을 얻을 수 있습니다. 휴대전화의 성능과 사용 편의성을 향상시킵니다. 갤럭시 S24 시리즈가 개척한 원 앤 검색 기능은 사용자가 길게 누르기만 하면 되는 기능 중 하나입니다.
