一
- //mongo不同类型对应有个数值，string对应为type:2 (详情见文末)
- db.sysUser.find({"age": {$type:2}}).forEach(
- function(x) {
- if(x.sc) {
- db.sysUser.updateOne({"_id": x._id}, {$set:{"age": parseFloat(x.age)}})
- }
- }
- )
二
- db.sysUser.find({"age": {$type:2}}).forEach(
- function(x) {
- if(x.age) {
- x.age= parseFloat(x.age);
- db.sysUser.save(x);
- }
- }
- )
- // string转为double类型
- x.age = parseFloat(x.age);
-
- // string转为int类型
- x.age = NumberInt(x.age);
-
- // string转化为date类型
- x.age = new ISODate(x.age);
| Type | Number | Alias | Notes |
|---|---|---|---|
| Double | 1 | "double" | |
| String | 2 | "string" | |
| Object | 3 | "object" | |
| Array | 4 | "array" | |
| Binary data | 5 | "binData" | |
| Undefined | 6 | "undefined" | Deprecated. |
| ObjectId | 7 | "objectId" | |
| Boolean | 8 | "bool" | |
| Date | 9 | "date" | |
| Null | 10 | "null" | |
| Regular Expression | 11 | "regex" | |
| DBPointer | 12 | "dbPointer" | Deprecated. |
| JavaScript | 13 | "javascript" | |
| Symbol | 14 | "symbol" | Deprecated. |
| JavaScript code with scope | 15 | "javascriptWithScope" | Deprecated in MongoDB 4.4. |
| 32-bit integer | 16 | "int" | |
| Timestamp | 17 | "timestamp" | |
| 64-bit integer | 18 | "long" | |
| Decimal128 | 19 | "decimal" | New in version 3.4. |
| Min key | -1 | "minKey" | |
| Max key | 127 | "maxKey" |