发布于 2015-09-14 15:05:47 | 71 次阅读 | 评论: 0 | 来源: 网络整理
The $comment makes it possible to attach a comment to a query. Because these comments propagate to the profile log, adding $comment modifiers can make your profile data much easier to interpret and trace. Use one of the following forms:
db.collection.find( { <query> } )._addSpecial( "$comment", <comment> )
db.collection.find( { $query: { <query> }, $comment: <comment> } )