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MongoDB query to update field and modify the data currently in column
For this, use find() along with update(). Let us create a collection with documents −
> db.demo115.insertOne({"LastName":"Brown"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2efe9bd8f64a552dae635a")
}Display all documents from a collection with the help of find() method −
> db.demo115.find();
This will produce the following output −
{ "_id" : ObjectId("5e2efe9bd8f64a552dae635a"), "LastName" : "Brown" }Following is the query to update field and modify the data currently in column −
> db.demo115.find({"LastName":"Brown"}).forEach(function(d) {
... db.demo115.update({_id: d._id}, {$set: {LastName: 'Hello ' + d.LastName}});
... })Display all documents from a collection with the help of find() method −
> db.demo115.find();
This will produce the following output −
{ "_id" : ObjectId("5e2efe9bd8f64a552dae635a"), "LastName" : "Hello Brown" }
Updated on: 30-Mar-2020
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