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How to get values of cursor in MongoDB?
To get values of cursor in MongoDB, use hasNext(). Let us create a collection with documents −
> db.demo191.insertOne({"EmployeeId":1,"EmployeeName":"Chris Brown"}); { "acknowledged" : true, "insertedId" : ObjectId("5e3ad95303d395bdc21346c5") } > db.demo191.insertOne({"EmployeeId":2,"EmployeeName":"David Miller"}); { "acknowledged" : true, "insertedId" : ObjectId("5e3ad95f03d395bdc21346c6") } > db.demo191.insertOne({"EmployeeId":1,"EmployeeName":"John Doe"}); { "acknowledged" : true, "insertedId" : ObjectId("5e3ad96803d395bdc21346c7") } > db.demo191.insertOne({"EmployeeId":1,"EmployeeName":"John Smith"}); { "acknowledged" : true, "insertedId" : ObjectId("5e3ad97003d395bdc21346c8") }
Display all documents from a collection with the help of find() method −
> db.demo191.find();
This will produce the following output −
{ "_id" : ObjectId("5e3ad95303d395bdc21346c5"), "EmployeeId" : 1, "EmployeeName" : "Chris Brown" } { "_id" : ObjectId("5e3ad95f03d395bdc21346c6"), "EmployeeId" : 2, "EmployeeName" : "David Miller" } { "_id" : ObjectId("5e3ad96803d395bdc21346c7"), "EmployeeId" : 1, "EmployeeName" : "John Doe" } { "_id" : ObjectId("5e3ad97003d395bdc21346c8"), "EmployeeId" : 1, "EmployeeName" : "John Smith" }
Following is the query to get values of cursor object −
> var cursor = db.demo191.find( { "EmployeeId":1 } ); > while (cursor.hasNext()) { ... print(tojson(cursor.next())); ...}
This will produce the following output −
{ "_id" : ObjectId("5e3ad95303d395bdc21346c5"), "EmployeeId" : 1, "EmployeeName" : "Chris Brown" } { "_id" : ObjectId("5e3ad96803d395bdc21346c7"), "EmployeeId" : 1, "EmployeeName" : "John Doe" } { "_id" : ObjectId("5e3ad97003d395bdc21346c8"), "EmployeeId" : 1, "EmployeeName" : "John Smith" }
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