JavaMadeSoEasy.com (JMSE): Query single Document From Collection In MongoDb in java

You are here : Home / Core Java Tutorials / MongoDB Tutorial / MongoDB java tutorial

In this mongoDB tutorial we will write java programs to Query single Document From Collection In MongoDb in java.

Contents of page >

Program to Query single Document From Collection In MongoDb in java >

Program to Query single Document From Collection In MongoDb in java >

package queryDocumentFromCollectionInMongoDb;

/**

* Write a program to Query single Document From Collection In MongoDb in java

import com.mongodb.BasicDBObject;

import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBObject;

import com.mongodb.MongoClient;

import com.mongodb.MongoClientURI;

public class QueryDocumentFromCollectionInMongoDb9_singleDocument {

public static void main(String[] args) {

/* Connect to MongoDB */

MongoClient mongoClient =

new MongoClient(new MongoClientURI("mongodb://localhost:27017"));

/* Connect to DATABASE */

//If in case database doesn't exists, it will be created at runtime

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

/* Get the COLLECTION (TABLE) */

//If in case collection (Table) doesn't exists, it will be created at runtime

DBCollection dbCollection = db.getCollection("Employee");

/*If collection already exists, you may remove everything

from collection for perfect OUTPUT of program*/

dbCollection.remove(new BasicDBObject()); //Not Mandatory

/* create a BasicDBObject (document /record) */

BasicDBObject basicDBObject1 = new BasicDBObject();

basicDBObject1.put("id", 1);

basicDBObject1.put("name", "Ankit");

/* Insert document/record in COLLECTION in MongoDB */

System.out.println("Insert document1");

dbCollection.insert(basicDBObject1);

/* create a BasicDBObject (document /record) */

BasicDBObject basicDBObject2 = new BasicDBObject();

basicDBObject2.put("id", 2);

basicDBObject2.put("name", "Sam");

/* Insert document/record in collection in MongoDB */

System.out.println("Insert document2");

dbCollection.insert(basicDBObject2);

/** findOne method returns a single document from collection. */

DBObject dbObject = dbCollection.findOne();

/** Display single document from collection */

System.out.println("\nDisplay single document from collection in MongoDB ");

System.out.println(dbObject);

}

/* OUTPUT

Insert document1

Insert document2

Display single document from collection in MongoDB

{ "_id" : { "$oid" : "585c191c7dbba61f08a7dd8c"} , "id" : 1 , "name" : "Ankit"}

So, we inserted two records but only one record was fetched using findOne method.

Download >

Now, it’s time to Download maven Project :) Click here.

Read : How to Import Maven project in eclipse

OR

Download jar from here and configure java build path in eclipse to add jars.

Having any doubt? or you liked the tutorial! Please comment in below section.

Please express your love by liking JavaMadeSoEasy.com(JMSE) on facebook, following on google+ or Twitter. You may join our fbGroup or linkedInGroup as well.