是的,您可以使用$indexOfCP来将字段值用作模式。让我们创建一个包含文档的集合-
> db.demo88.insertOne( ... { ... "Name": "Chris", ... "PassoutYear": "2020", ... "websiteName": "chris.shop.com/Carol-2020-" ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e2c14c471bf0181ecc422b1") } > db.demo88.insertOne( ... { ... "Name": "David", ... "PassoutYear": "2010", ... "websiteName": "david.bigshop.com/David-2010-" ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e2c14c571bf0181ecc422b2") }
在find()
方法的帮助下显示集合中的所有文档-
> db.demo88.find();
这将产生以下输出-
{ "_id" : ObjectId("5e2c14c471bf0181ecc422b1"), "Name" : "Chris", "PassoutYear" : "2020", "websiteName" : "chris.shop.com/Carol-2020-" } { "_id" : ObjectId("5e2c14c571bf0181ecc422b2"), "Name" : "David", "PassoutYear" : "2010", "websiteName" : "david.bigshop.com/David-2010-" }
以下是将字段值用作$regex中的模式的查询-
> db.demo88.aggregate([ { "$match": { "$expr": { "$ne": [ { "$indexOfCP": ["$websiteName", "$Name"] }, -1 ] } }} ])
这将产生以下输出-
{ "_id" : ObjectId("5e2c14c571bf0181ecc422b2"), "Name" : "David", "PassoutYear" : "2010", "websiteName" : "david.bigshop.com/David-2010-" }