MongoDB에서 커서 값을 얻는 방법은 무엇입니까?

MongoDB에서 커서 값을 얻으려면 hasNext()를 사용하십시오. 문서로 컬렉션을 만들자 −

> 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")
}

find() 메서드를 사용하여 컬렉션의 모든 문서 표시 -

> db.demo191.find();

이것은 다음과 같은 출력을 생성합니다 -

{ "_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" }

다음은 커서 개체의 값을 가져오는 쿼리입니다 -

> var cursor = db.demo191.find( { "EmployeeId":1 } );
> while (cursor.hasNext()) {
...   print(tojson(cursor.next()));
...}

이것은 다음과 같은 출력을 생성합니다 -

{
   "_id" : ObjectId("5e3ad95303d395bdc21346c5"),
   "EmployeeId" : 1,
   "EmployeeName" : "Chris Brown"
}
{
   "_id" : ObjectId("5e3ad96803d395bdc21346c7"),
   "EmployeeId" : 1,
   "EmployeeName" : "John Doe"
}
{
   "_id" : ObjectId("5e3ad97003d395bdc21346c8"),
   "EmployeeId" : 1,
   "EmployeeName" : "John Smith"
}