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MongoDB query to update only certain fields?
To update only certain fields, use $set. Let us create a collection with documents −
> db.demo265.insertOne({"id":101,"Name":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e480d781627c0c63e7dbaa4") } > db.demo265.insertOne({"id":102,"Name":"Bob"}); { "acknowledged" : true, "insertedId" : ObjectId("5e480d7d1627c0c63e7dbaa5") } > db.demo265.insertOne({"id":103,"Name":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e480d841627c0c63e7dbaa6") }
Display all documents from a collection with the help of find() method −
> db.demo265.find();
This will produce the following output −
{ "_id" : ObjectId("5e480d781627c0c63e7dbaa4"), "id" : 101, "Name" : "Chris" } { "_id" : ObjectId("5e480d7d1627c0c63e7dbaa5"), "id" : 102, "Name" : "Bob" } { "_id" : ObjectId("5e480d841627c0c63e7dbaa6"), "id" : 103, "Name" : "David" }
Following is the query to update only certain fields −
> db.demo265.update({Name:"David"},{$set:{id:10004}}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo265.find();
This will produce the following output −
{ "_id" : ObjectId("5e480d781627c0c63e7dbaa4"), "id" : 101, "Name" : "Chris" } { "_id" : ObjectId("5e480d7d1627c0c63e7dbaa5"), "id" : 102, "Name" : "Bob" } { "_id" : ObjectId("5e480d841627c0c63e7dbaa6"), "id" : 10004, "Name" : "David" }
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