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How to update a single field in a capped collection in MongoDB?
To update, you need to use update() for the field whose collection is set with capped: true. Let us create a collection with documents −
> db.createCollection("Demo112", { capped : true, size : 14, max : 3 } );
{ "ok" : 1 }
> db.demo112.insertOne({"Name":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2ef47a9fd5fd66da21447e")
}
> db.demo112.insertOne({"Name":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2ef47e9fd5fd66da21447f")
}
> db.demo112.insertOne({"Name":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2ef4919fd5fd66da214480")
}Display all documents from a collection with the help of find() method −
> db.demo112.find();
This will produce the following output −
{ "_id" : ObjectId("5e2ef47a9fd5fd66da21447e"), "Name" : "Chris" }
{ "_id" : ObjectId("5e2ef47e9fd5fd66da21447f"), "Name" : "David" }
{ "_id" : ObjectId("5e2ef4919fd5fd66da214480"), "Name" : "David" }Following is the query to update a single field in a capped collection −
> db.demo112.update(
... {Name:"David"},
... {$set:{Name: "Robert"}},
... {multi:true}
... )
WriteResult({ "nMatched" : 2, "nUpserted" : 0, "nModified" : 2 })Display all documents from a collection with the help of find() method −
> db.demo112.find();
This will produce the following output −
{ "_id" : ObjectId("5e2ef47a9fd5fd66da21447e"), "Name" : "Chris" }
{ "_id" : ObjectId("5e2ef47e9fd5fd66da21447f"), "Name" : "Robert" }
{ "_id" : ObjectId("5e2ef4919fd5fd66da214480"), "Name" : "Robert" }
Updated on: 30-Mar-2020
199 Views
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