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 No SQL > Mongo DB > How to check whether a Collection exists

How to check whether a Collection exists 

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 verify whether a Collection exists.

File Name  :  
com/bethecoder/tutorials/mongodb/tests/CollectionExistanceTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.mongodb.tests;

import java.net.UnknownHostException;

import com.mongodb.DB;
import com.mongodb.Mongo;
import com.mongodb.MongoException;

public class CollectionExistanceTest {

  /**
   @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");
      
      //Returns a boolean specifying whether the collection exists or not
      boolean exists = database.collectionExists("students");
      System.out.println(exists);
      
      exists = database.collectionExists("unknown_collection");
      System.out.println(exists);
      
    catch (UnknownHostException e) {
      e.printStackTrace();
    catch (MongoException e) {
      e.printStackTrace();
    }
  }
}
   

It gives the following output,
true
false


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