发布于 2015-09-14 15:07:57 | 74 次阅读 | 评论: 0 | 来源: 网络整理
The $bit operator performs a bitwise update of a field. Only use this with integer fields. For example:
db.collection.update( { field: 1 }, { $bit: { field: { and: 5 } } } );
Here, the $bit operator updates the integer value of the field named field with a bitwise and: 5 operation. This operator only works with number types.