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MongoDB query to increment a specific value using custom variable
Set a custom variable and use update() along with $inc to increment. Let us create a collection with documents −
> db.demo271.insertOne({"Marks":56});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4821211627c0c63e7dbabc")
}
> db.demo271.insertOne({"Marks":78});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4821241627c0c63e7dbabd")
}
> db.demo271.insertOne({"Marks":72});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48212b1627c0c63e7dbabe")
}Display all documents from a collection with the help of find() method −
> db.demo271.find();
This will produce the following output −
{ "_id" : ObjectId("5e4821211627c0c63e7dbabc"), "Marks" : 56 }
{ "_id" : ObjectId("5e4821241627c0c63e7dbabd"), "Marks" : 78 }
{ "_id" : ObjectId("5e48212b1627c0c63e7dbabe"), "Marks" : 72 }Following is the query to increment using a custom variable −
> var incrementValue=10;
> db.demo271.update(
... { Marks: 78 },
... { $inc: { Marks:incrementValue } }
...)
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo271.find();
This will produce the following output −
{ "_id" : ObjectId("5e4821211627c0c63e7dbabc"), "Marks" : 56 }
{ "_id" : ObjectId("5e4821241627c0c63e7dbabd"), "Marks" : 88 }
{ "_id" : ObjectId("5e48212b1627c0c63e7dbabe"), "Marks" : 72 }
Updated on 31-Mar-2020 08:50:12
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