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MongoDB query to insert but limit the total records
To insert and limit the total records while inserting, use capped:true and set the size and max values.
Let us create a collection with documents wherein we have set capped:true and size to 4 −
> db.createCollection("demo297", {capped:true, size:4,max:4});
{ "ok" : 1 }
> db.demo297.insertOne({"Name":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4d54385d93261e4bc9ea43")
}
> db.demo297.insertOne({"Name":"Bob"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4d543e5d93261e4bc9ea44")
}
> db.demo297.insertOne({"Name":"Mike"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4d543e5d93261e4bc9ea45")
}
> db.demo297.insertOne({"Name":"Sam"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4d543f5d93261e4bc9ea46")
}
> db.demo297.insertOne({"Name":"John"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4d54405d93261e4bc9ea47")
}Display all documents from a collection with the help of find() method −
> db.demo297.find();
This will produce the following output −
{ "_id" : ObjectId("5e4d543e5d93261e4bc9ea44"), "Name" : "Bob" }
{ "_id" : ObjectId("5e4d543e5d93261e4bc9ea45"), "Name" : "Mike" }
{ "_id" : ObjectId("5e4d543f5d93261e4bc9ea46"), "Name" : "Sam" }
{ "_id" : ObjectId("5e4d54405d93261e4bc9ea47"), "Name" : "John" }
Updated on: 01-Apr-2020
190 Views
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