How can we update a record in MongoDB?

To update a record, you need to update on the basis of _id. Let us create a collection with documents −

> db.demo458.insertOne( {_id:101,"Name":"David" } ); { "acknowledged" : true, "insertedId" : 101 } > db.demo458.insertOne( {_id:102,"Name":"Chris" } ); { "acknowledged" : true, "insertedId" : 102 } > db.demo458.insertOne( {_id:103,"Name":"Bob" } ); { "acknowledged" : true, "insertedId" : 103 }

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

> db.demo458.find();

This will produce the following output −

{ "_id" : 101, "Name" : "David" } { "_id" : 102, "Name" : "Chris" } { "_id" : 103, "Name" : "Bob" }

Following is the query to update a record in MongoDB −

> db.demo458.update({_id:102},{$set:{"Name":"David Miller"}}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

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

> db.demo458.find();

This will produce the following output −

{ "_id" : 101, "Name" : "David" } { "_id" : 102, "Name" : "David Miller" } { "_id" : 103, "Name" : "Bob" }