BE THE CODER > No SQL > Mongo DB Examples > How to insert Nested Documents using Map

MongoDB is a scalable, high-performance, open source NoSQL database. It offers Ad hoc queries, Indexing, Replication, Load balancing, File storage (GridFS), Aggregation, MapReduce and Server-side JavaScript execution. This requires the library mongo-2.8.0.jar to be present in the classpath. The following example shows how to insert a nested document in Mongo database.

File Name :	com/bethecoder/tutorials/mongodb/tests/NestedDocInsertionTest3.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.mongodb.tests;



import java.net.UnknownHostException;

import java.util.HashMap;

import java.util.Map;



import com.mongodb.BasicDBObject;

import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBCursor;

import com.mongodb.DBObject;

import com.mongodb.Mongo;

import com.mongodb.MongoException;



public class NestedDocInsertionTest3 {



  /**

   * @param args

   */

  public static void main(String[] args) {

    try {

      //Connect to mongoDB with given IP and PORT

      Mongo mongo = new Mongo("localhost", 27017);

      

      //Get the database object

      DB database = mongo.getDB("mytestdb");

      

      //Gets a collection with a given name.

        //If the collection does not exist, a new collection is created.

      DBCollection collection = database.getCollection("studentdetails");

      

      //Create and insert document to collection

      Map<String, Object> document = new HashMap<String, Object>();

      document.put("name", "Sriram");

      document.put("age", 2);

      

      Map<String, Object> address = new HashMap<String, Object>();

      address.put("DoorNo", "1-2-3-4");

      address.put("City", "Bangalore");

      

      document.put("address", address);

      

      //Saves a document to the database

      collection.insert(new BasicDBObject(document));

      

      //Queries for all objects in this collection

      DBCursor dbCursor = collection.find();

      DBObject record = null;

      

      while (dbCursor.hasNext()) {

        record = dbCursor.next();

        System.out.println(record);

      }

      

    } catch (UnknownHostException e) {

      e.printStackTrace();

    } catch (MongoException e) {

      e.printStackTrace();

    }

  }



}