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Update a MongoDB document with Student Id and Name
To update, use UPDATE() and $set. Let us create a collection with documents −
> db.demo427.insertOne({"StudentId":101,"StudentName":"Chris Brown"}); { "acknowledged" : true, "insertedId" : ObjectId("5e75e711bbc41e36cc3cae75") } > db.demo427.insertOne({"StudentId":102,"StudentName":"David Miller"}); { "acknowledged" : true, "insertedId" : ObjectId("5e75e71abbc41e36cc3cae76") } > db.demo427.insertOne({"StudentId":103,"StudentName":"John Smith"}); { "acknowledged" : true, "insertedId" : ObjectId("5e75e725bbc41e36cc3cae77") } > db.demo427.insertOne({"StudentId":104,"StudentName":"Carol Taylor"}); { "acknowledged" : true, "insertedId" : ObjectId("5e75e733bbc41e36cc3cae78") }
Display all documents from a collection with the help of find() method −
> db.demo427.find();
This will produce the following output −
{ "_id" : ObjectId("5e75e711bbc41e36cc3cae75"), "StudentId" : 101, "StudentName" : "Chris Brown" } { "_id" : ObjectId("5e75e71abbc41e36cc3cae76"), "StudentId" : 102, "StudentName" : "David Miller" } { "_id" : ObjectId("5e75e725bbc41e36cc3cae77"), "StudentId" : 103, "StudentName" : "John Smith" } { "_id" : ObjectId("5e75e733bbc41e36cc3cae78"), "StudentId" : 104, "StudentName" : "Carol Taylor" }
Following is the query to update MongoDB document −
> db.demo427.update({"StudentId":102},{$set:{"StudentName":"John Doe"}}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo427.find();
This will produce the following output −
{ "_id" : ObjectId("5e75e711bbc41e36cc3cae75"), "StudentId" : 101, "StudentName" : "Chris Brown" } { "_id" : ObjectId("5e75e71abbc41e36cc3cae76"), "StudentId" : 102, "StudentName" : "John Doe" } { "_id" : ObjectId("5e75e725bbc41e36cc3cae77"), "StudentId" : 103, "StudentName" : "John Smith" } { "_id" : ObjectId("5e75e733bbc41e36cc3cae78"), "StudentId" : 104, "StudentName" : "Carol Taylor" }
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