mongoDB : java : Create a collection

Creating a collection is a three step process.

Step 1: Get Mongo client

MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

Step 2: Connect to database

DB db = mongoClient.getDB("sample");

Step 3: Use the create collection method, to create collection.

DBCollection collection = db.createCollection("employee", null);

import java.net.UnknownHostException;
import com.mongodb.MongoClient;
import com.mongodb.DB;
import com.mongodb.DBCollection;


public class DatabaseConnect {

  /* Step 1 : get mongoCLient */
  public static MongoClient getMongoClient(){
    MongoClient mongoClient = null;
     try {
       mongoClient = new MongoClient( "localhost" , 27017 );
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
     return mongoClient;
  }
  
  public static void main(String args[]){
    MongoClient mongoClient = getMongoClient();
    
    /* Step 2: Connect to DB */
    DB db = mongoClient.getDB("sample");
    
    DBCollection collection = db.createCollection("employee", null);
    
    System.out.println("Collection created ");
    System.out.println("Collection employee belongs to db " + collection.getDB());
  }
}

Output

Collection created 
Collection employee belongs to db sample

Note:

Usually collection will not create, until you insert some data into it.

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