需要完全删除mongodb数据库中某个字段,用法如下: db.example.update( {}, {$unset: {words:1}}, false, true) 需要重命名collection中某个字段,则可以用: db.example.update( {}, {$rename:{"name.old":"name.new"}}, false, true); 若需要,第一个参数可以写 query 作为限制。 refs: http://stackoverflow.com/questions/6851933/how-do-i-remove-a-field-completely-from-mongo http://stackoverflow.com/questions/9254351/how-can-i-rename-a-field-for-all-documents-in-mongodb Talk with Kimi Categories: Code Tags: MongoDB Yu Ideals are like the stars: we never reach them, but like the mariners of the sea, we chart our course by them. 8 Comments Michael · August 31, 2015 at 11:01 Google Chrome 44.0.2403.155 Mac OS X 10.10.4谢谢,太棒了 Michael · August 31, 2015 at 10:24 Google Chrome 44.0.2403.155 Mac OS X 10.10.4怎么删除字段中的某个值呢 yu · August 31, 2015 at 10:41 Google Chrome 44.0.2403.157 Mac OS X 10.10.5@Michael 可以点进去 { "key" : { "subkey": "value" } } 若想要删除subkey,只要执行 db.example.update({},{$unset: {"key.subkey":1}},false,true) 如上即可. 不过还有一些更复杂的,比如如下: { key: [ { "id": 1, "subkey":value1 }, { "id": 2, "subkey":value2 } ] } 若你只想删除id为1的的subkey,你可以使用如下命令: db.example.update( {"key.id":1}, {$unset: {"key.$.subkey":1}},false,true) yu · August 31, 2015 at 10:42 Google Chrome 44.0.2403.157 Mac OS X 10.10.5@Michael 对array的操作,可以参考这个文档: https://docs.mongodb.org/v3.0/reference/operator/update/positional/ Leniy · March 21, 2015 at 09:20 Google Chrome 31.0.1650.63 Windows 7 x64 Edition怎么又改名成yuik了? yu · March 21, 2015 at 13:29 Google Chrome 41.0.2272.89 Mac OS X 10.10.2@Leniy 随便换的 .. Leniy · March 18, 2015 at 18:24 MIUI Browser 1.0 Android 4.2.2好久不关注数据库了 yu · March 18, 2015 at 22:26 Google Chrome 41.0.2272.89 Mac OS X 10.10.2@Leniy 我最近一年生活中几乎只有数据库… Leave a Reply Cancel reply Your email address will not be published. Required fields are marked * Name * Email * Website What's on your mind? Save my name, email, and website in this browser for the next time I comment. Δ
8 Comments
Michael · August 31, 2015 at 11:01
谢谢,太棒了
Michael · August 31, 2015 at 10:24
怎么删除字段中的某个值呢
yu · August 31, 2015 at 10:41
@Michael 可以点进去
若想要删除subkey,只要执行
如上即可.
不过还有一些更复杂的,比如如下:
若你只想删除id为1的的subkey,你可以使用如下命令:
yu · August 31, 2015 at 10:42
@Michael 对array的操作,可以参考这个文档: https://docs.mongodb.org/v3.0/reference/operator/update/positional/
Leniy · March 21, 2015 at 09:20
怎么又改名成yuik了?
yu · March 21, 2015 at 13:29
@Leniy 随便换的 ..
Leniy · March 18, 2015 at 18:24
好久不关注数据库了
yu · March 18, 2015 at 22:26
@Leniy 我最近一年生活中几乎只有数据库…