时间：2021-07-01 10:21:17 帮助过：24人阅读
MongoDB OR 条件语句使用了关键字 $or,语法格式如下：
>db.col.find(
- <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">
- $or<span class="pun">:<span class="pln"> <span class="pun">[<span class="pln">
- <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">
- <span class="pun">]<span class="pln">
- <span class="pun">}<span class="pln">
- <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>
$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 |
- <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>
- <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)
标签：bre some opd body eve and date 操作 value