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Can I get the first item in a Cursor object in MongoDB?
Yes, you can get the first item in a cursor object using findOne() method. Following is the syntax
db.yourCollectionName.findOne();
However, the following syntax is used if you want a single document in a cursor object
db.yourCollectionName.findOne({yourCondition});
We will first create a collection. Following is the query to create a collection with documents
> db.getFirstItemDemo.insertOne({"CustomerName":"Chris","CustomerAge":28}); { "acknowledged" : true, "insertedId" : ObjectId("5c989059330fd0aa0d2fe4c1") } > db.getFirstItemDemo.insertOne({"CustomerName":"Larry","CustomerAge":26}); { "acknowledged" : true, "insertedId" : ObjectId("5c989063330fd0aa0d2fe4c2") } > db.getFirstItemDemo.insertOne({"CustomerName":"Robert","CustomerAge":29}); { "acknowledged" : true, "insertedId" : ObjectId("5c98906d330fd0aa0d2fe4c3") } > db.getFirstItemDemo.insertOne({"CustomerName":"David","CustomerAge":39}); { "acknowledged" : true, "insertedId" : ObjectId("5c989081330fd0aa0d2fe4c4") }
Following is the query to display all documents from the collection with the help of find() method
> db.getFirstItemDemo.find().pretty();
This will produce the following output
{ "_id" : ObjectId("5c989059330fd0aa0d2fe4c1"), "CustomerName" : "Chris", "CustomerAge" : 28 } { "_id" : ObjectId("5c989063330fd0aa0d2fe4c2"), "CustomerName" : "Larry", "CustomerAge" : 26 } { "_id" : ObjectId("5c98906d330fd0aa0d2fe4c3"), "CustomerName" : "Robert", "CustomerAge" : 29 } { "_id" : ObjectId("5c989081330fd0aa0d2fe4c4"), "CustomerName" : "David", "CustomerAge" : 39 }
Following is the query to get the first item in a cursor object
> db.getFirstItemDemo.findOne();
This will produce the following output
{ "_id" : ObjectId("5c989059330fd0aa0d2fe4c1"), "CustomerName" : "Chris", "CustomerAge" : 28 }
Above, we have the first item in a cursor object. Following is the query to get a single document in a cursor object
> db.getFirstItemDemo.findOne({"CustomerAge":39});
This will produce the following output
{ "_id" : ObjectId("5c989081330fd0aa0d2fe4c4"), "CustomerName" : "David", "CustomerAge" : 39 }
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