您可以update()
与$运算符一起使用。首先让我们创建一个包含文档的集合-
> db.addAFieldDemo.insertOne( ... { ... ... "ClientName" : "Larry", ... "ClientCountryName" : "US", ... "ClientOtherDetails" : [ ... { ... "ClientProjectName":"Online Banking System" ... } ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5cd44bdc2cba06f46efe9ee8") }
以下是在find()
方法的帮助下显示集合中所有文档的查询-
> db.addAFieldDemo.find().pretty();
这将产生以下输出-
{ "_id" : ObjectId("5cd44bdc2cba06f46efe9ee8"), "ClientName" : "Larry", "ClientCountryName" : "US", "ClientOtherDetails" : [ { "ClientProjectName" : "Online Banking System" } ] }
以下是将字段添加到数组中的嵌入式文档的查询-
> db.addAFieldDemo.update({ClientOtherDetails:{$elemMatch:{"ClientProjectName" : "Online Banking System"}}}, ... {$set :{'ClientOtherDetails.$.isMarried':true}},true); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
让我们显示上述集合中的所有文档-
> db.addAFieldDemo.find().pretty();
这将产生以下输出-
{ "_id" : ObjectId("5cd44bdc2cba06f46efe9ee8"), "ClientName" : "Larry", "ClientCountryName" : "US", "ClientOtherDetails" : [ { "ClientProjectName" : "Online Banking System", "isMarried" : true } ] }