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

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/NestedDocInsertionTest4.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.mongodb.tests;



import java.net.UnknownHostException;



import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBCursor;

import com.mongodb.DBObject;

import com.mongodb.Mongo;

import com.mongodb.MongoException;

import com.mongodb.util.JSON;



public class NestedDocInsertionTest4 {



  /**

   * @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");

      

      //Parse JSON String to get 

      String jsonString = "{ 'name' : 'Sriram' , 'age' : 2 , " +

          "'address' : { 'DoorNo' : '1-2-3-4' , 'City' : 'Bangalore'}}";

      

      //Parse the JSON String

      DBObject document = (DBObject) JSON.parse(jsonString);

      

      //Saves a document to the database

      collection.insert(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();

    }

  }



}