MongoDB $elemMatch to match document

MongoDBDatabaseBig Data Analytics

Let us create a collection with documents −

> 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 }

Display all documents from a collection with the help of find() method −

> db.demo313.find();

This will produce the following output −

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

Following is the query to match document with $elemMatch in MongoDB −

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

This will produce the following output −

{ "_id" : 101, "details" : [ { "Name" : "David", "Age" : 22 } ] }
raja
Published on 01-Apr-2020 07:48:10
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