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How to update a MongoDB document without overwriting the existing one?
To update only a field value, use update() along with $set. This won’t overwrite the existing one. Let us first create a collection with documents −
> db.demo401.insertOne(
... {
... "_id" : 1001,
... "Name" : "Chris",
... "SubjectName" : "MongoDB",
... "Score" : 45
... }
... );
{ "acknowledged" : true, "insertedId" : 1001 }Display all documents from a collection with the help of find() method −
> db.demo401.find();
This will produce the following output −
{ "_id" : 1001, "Name" : "Chris", "SubjectName" : "MongoDB", "Score" : 45 }Following is the query to update a document without overwriting the existing one −
> db.demo401.update({_id: 1001}, {$set: {Score:89}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo401.find();
This will produce the following output −
{ "_id" : 1001, "Name" : "Chris", "SubjectName" : "MongoDB", "Score" : 89 }
Updated on: 03-Apr-2020
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