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MongoDB学习笔记(一)

时间:2021-07-01 10:21:17 帮助过:24人阅读

MongoDB OR 条件

MongoDB OR 条件语句使用了关键字 $or,语法格式如下:

>db.col.find(

  1. <span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"> <span class="pun">{<span class="pln">
  2. $or<span class="pun">:<span class="pln"> <span class="pun">[<span class="pln">
  3.      <span class="pun">{<span class="pln">key1<span class="pun">:<span class="pln"> value1<span class="pun">},<span class="pln"> <span class="pun">{<span class="pln">key2<span class="pun">:<span class="pln">value2<span class="pun">}<span class="pln">
  4. <span class="pun">]<span class="pln">
  5. <span class="pun">}<span class="pln">
  6. <span class="pun">).<span class="pln">pretty<span class="pun">()<br><br></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

MongoDB $type 操作符

$type操作符是基于BSON类型来检索集合中匹配的数据类型,并返回结果。

MongoDB 中可以使用的类型如下表所示:

 

类型数字备注
Double 1  
String 2  
Object 3  
Array 4  
Binary data 5  
Undefined 6 已废弃。
Object id 7  
Boolean 8  
Date 9  
Null 10  
Regular Expression 11  
JavaScript 13  
Symbol 14  
JavaScript (with scope) 15  
32-bit integer 16  
Timestamp 17  
64-bit integer 18  
Min key 255 Query with -1.
Max key 127  
  1. <span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><br></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"> </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
  1. <span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"><span class="pln"><span class="pun"> </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

MongoDB学习笔记(一)

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