BE THE CODER > No SQL > Mongo DB Examples > How to get all users in Mongo Database

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 list all users in a given Mongo database.

File Name :	com/bethecoder/tutorials/mongodb/tests/GetUsersTest.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;



public class GetUsersTest {



  /**

   * @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.

      DBCollection userCollection = database.getCollection("system.users");

      

      //Queries for all objects in this collection

      DBCursor dbCursor = userCollection.find();

      DBObject userRecord = null;

      

      while (dbCursor.hasNext()) {

        userRecord = dbCursor.next();

        System.out.println(userRecord);

      }

      

    } catch (UnknownHostException e) {

      e.printStackTrace();

    } catch (MongoException e) {

      e.printStackTrace();

    }

  }

}

{ "_id" : { "$oid" : "503bc7c672816f08a5ecc26e"} , "user" : "user1" , "pwd" : "86c2563c85a9cf4d5f05d4c42674bc0d" , "readOnly" : false} { "_id" : { "$oid" : "503bc7c672816f08a5ecc26f"} , "user" : "user2" , "pwd" : "a94779325b5df23dc7146b6d29e0812e" , "readOnly" : false} { "_id" : { "$oid" : "503bc7c672816f08a5ecc270"} , "user" : "user3" , "pwd" : "b54682a7b133c4078b7073afa01ee913" , "readOnly" : false} { "_id" : { "$oid" : "503bc7c672816f08a5ecc271"} , "user" : "user4" , "pwd" : "9260e6d40933f393293f764cae00eab4" , "readOnly" : false} { "_id" : { "$oid" : "503bc7c672816f08a5ecc272"} , "user" : "readonlyuser1" , "pwd" : "1255cd2eb04d2cc8c1a4739f454c652b" , "readOnly" : true} { "_id" : { "$oid" : "503bc7c672816f08a5ecc273"} , "user" : "readonlyuser2" , "pwd" : "e37efdd90c603d6fbc8bf89e38d3c0ec" , "readOnly" : true} { "_id" : { "$oid" : "503bc7c672816f08a5ecc274"} , "user" : "readonlyuser3" , "pwd" : "3ebac9f3e2abb3037b41820bc8b3e2dd" , "readOnly" : true} { "_id" : { "$oid" : "503bc7c672816f08a5ecc275"} , "user" : "readonlyuser4" , "pwd" : "b6e658e83d2407939bbac18dcfc0abdf" , "readOnly" : true}