MongoDB $elemMatch ডকুমেন্ট মেলে

আসুন আমরা নথি-

> db.demo313.insertOne({"_id":100,"details":[{"Name":"Chris","Age":24}]});
{ "acknowledged" : true, "insertedId" : 100 }
> db.demo313.insertOne({"_id":101,"details":[{"Name":"David","Age":22}]});
{ "acknowledged" : true, "insertedId" : 101 }
> db.demo313.insertOne({"_id":102,"details":[{"Name":"Mike","Age":25}]});
{ "acknowledged" : true, "insertedId" : 102 }

Find() পদ্ধতি -

> db.demo313.find();

এটি নিম্নলিখিত আউটপুট −

{ "_id" : 100, "details" : [ { "Name" : "Chris", "Age" : 24 } ] }
{ "_id" : 101, "details" : [ { "Name" : "David", "Age" : 22 } ] }
{ "_id" : 102, "details" : [ { "Name" : "Mike", "Age" : 25 } ] }

MongoDB −

db.demo313.find({_id:101},{details: { $elemMatch: { Age: 22 } } } );

এটি নিম্নলিখিত আউটপুট −

{ "_id" : 101, "details" : [ { "Name" : "David", "Age" : 22 } ] }