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Identify last document from MongoDB find() result set?
To identify the last document from MongoDB find() result set, you can use sort() in descending order. The syntax is as follows −
db.yourCollectionName.find().sort( { _id : -1 } ).limit(1).pretty();
To understand the above syntax, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.identifyLastDocuementDemo.insertOne({"UserName":"Larry","UserAge":24,"UserCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94a2ff4cf1f7a64fa4df57")
}
> db.identifyLastDocuementDemo.insertOne({"UserName":"Chris","UserAge":21,"UserCountryName":"UK"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94a3094cf1f7a64fa4df58")
}
> db.identifyLastDocuementDemo.insertOne({"UserName":"David","UserAge":25,"UserCountryName":"AUS"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94a3174cf1f7a64fa4df59")
}
> db.identifyLastDocuementDemo.insertOne({"UserName":"Sam","UserAge":26,"UserCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94a3224cf1f7a64fa4df5a")
}
> db.identifyLastDocuementDemo.insertOne({"UserName":"Mike","UserAge":27,"UserCountryName":"AUS"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94a32e4cf1f7a64fa4df5b")
}
> db.identifyLastDocuementDemo.insertOne({"UserName":"Carol","UserAge":28,"UserCountryName":"UK"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94a33c4cf1f7a64fa4df5c")
}
Display all documents from a collection with the help of find() method. The query is as follows −
> db.identifyLastDocuementDemo.find().pretty();
The following is the output −
{
"_id" : ObjectId("5c94a2ff4cf1f7a64fa4df57"),
"UserName" : "Larry",
"UserAge" : 24,
"UserCountryName" : "US"
}
{
"_id" : ObjectId("5c94a3094cf1f7a64fa4df58"),
"UserName" : "Chris",
"UserAge" : 21,
"UserCountryName" : "UK"
}
{
"_id" : ObjectId("5c94a3174cf1f7a64fa4df59"),
"UserName" : "David",
"UserAge" : 25,
"UserCountryName" : "AUS"
}
{
"_id" : ObjectId("5c94a3224cf1f7a64fa4df5a"),
"UserName" : "Sam",
"UserAge" : 26,
"UserCountryName" : "US"
}
{
"_id" : ObjectId("5c94a32e4cf1f7a64fa4df5b"),
"UserName" : "Mike",
"UserAge" : 27,
"UserCountryName" : "AUS"
}
{
"_id" : ObjectId("5c94a33c4cf1f7a64fa4df5c"),
"UserName" : "Carol",
"UserAge" : 28,
"UserCountryName" : "UK"
}
Here is the query to identify the last document from MongoDB find() result set −
> db.identifyLastDocuementDemo.find().sort( { _id : -1 } ).limit(1).pretty();
The following is the output −
{
"_id" : ObjectId("5c94a33c4cf1f7a64fa4df5c"),
"UserName" : "Carol",
"UserAge" : 28,
"UserCountryName" : "UK"
}
Updated on: 2019-07-30T22:30:25+05:30
232 Views
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