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How to index and sort with pagination using custom field in MongoDB?
Let us first create a collection with documents −
> db.demo373.createIndex({"Name":1,"CountryName":1});
{
"createdCollectionAutomatically" : true,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
> db.demo373.insertOne({"Name":"Chris","Age":22,"CountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e59ffde2ae06a1609a00aff")
}
> db.demo373.insertOne({"Name":"David","Age":21,"CountryName":"AUS"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e59ffe82ae06a1609a00b00")
}
> db.demo373.insertOne({"Name":"Bob","Age":23,"CountryName":"UK"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e59fff42ae06a1609a00b01")
}
> db.demo373.insertOne({"Name":"John","Age":21,"CountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e59ffff2ae06a1609a00b02")
}
> db.demo373.insertOne({"Name":"Carol","Age":23,"CountryName":"AUS"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e5a00082ae06a1609a00b03")
}Display all documents from a collection with the help of find() method −
> db.demo373.find();
This will produce the following output −
{ "_id" : ObjectId("5e59ffde2ae06a1609a00aff"), "Name" : "Chris", "Age" : 22, "CountryName" : "US" }
{ "_id" : ObjectId("5e59ffe82ae06a1609a00b00"), "Name" : "David", "Age" : 21, "CountryName" : "AUS" }
{ "_id" : ObjectId("5e59fff42ae06a1609a00b01"), "Name" : "Bob", "Age" : 23, "CountryName" : "UK" }
{ "_id" : ObjectId("5e59ffff2ae06a1609a00b02"), "Name" : "John", "Age" : 21, "CountryName" : "US" }
{ "_id" : ObjectId("5e5a00082ae06a1609a00b03"), "Name" : "Carol", "Age" : 23, "CountryName" : "AUS" }Following is the query to implement index and sorting with pagination in MongoDB −
> db.demo373.find().sort({"Name":1, "Age":1}).limit(4).skip(2);This will produce the following output −
{ "_id" : ObjectId("5e59ffde2ae06a1609a00aff"), "Name" : "Chris", "Age" : 22, "CountryName" : "US" }
{ "_id" : ObjectId("5e59ffe82ae06a1609a00b00"), "Name" : "David", "Age" : 21, "CountryName" : "AUS" }
{ "_id" : ObjectId("5e59ffff2ae06a1609a00b02"), "Name" : "John", "Age" : 21, "CountryName" : "US" }
Updated on: 02-Apr-2020
299 Views
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