CODEWITHSUNDEEP
javaarraysmongodb
Tushar Tiwari
Tushar Tiwari

Reputation: 121

array not initialising properly. BasicDBObject not able to create array of BasicDBObject type

case 3:
    BasicDBObject []document= new BasicDBObject(); // error             
    DBCollection table1 = db.getCollection("user");
    document[0].put("name", "mkyong");
    document[0].put("age", 30);
    table1.insert(document);
    System.out.println("Collection Inserted successfully");
    break;

Not understanding the problem with the initialization.

Upvotes: 0

Views: 196

Answers (3)

ranafeb14
ranafeb14

Reputation: 437

you would get compile time error because the array initialization is not correct.

BasicDBObject []document= new BasicDBObject(); //error

Basic Array Initialization in java is as below

Object objectArr[] = new Object[10];

So you have to initialize the array and pass the values in below manner.

BasicDBObject []document1= new BasicDBObject[2];

document1[0] = new BasicDBObject();
document1[0].put("name", "mkyong12");
document1[0].put("age", 30);

document1[1] = new BasicDBObject();
document1[1].put("name", "test12");
document1[1].put("age", 44);

You have to make sure each array object should be initialized otherwise you fail with NullPointerException

Hope this helps.

Upvotes: 1

Shahid
Shahid

Reputation: 2330

You can use BasicDBList:

BasicDBObject document = new BasicDBObject();
document.put("name", "mkyong");
document.put("age", 30);

BasicDBList documentList = new BasicDBList();
documentList.add(document);

DBCollection table1 = db.getCollection("user");
table1.insert(documentList.get(0));
System.out.println("Collection Inserted successfully");

Upvotes: 0

4J41
4J41

Reputation: 5095

insert method takes a DBObject.

BasicDBObject document= new BasicDBObject();
document.put("name", "mkyong");
document.put("age", 30);
table1.insert(document);

Upvotes: 0

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