mongoDB : Java : Find documents where field is equal to value

Below snippet gets all documents where “firstName” is “Gopi”.

BasicDBObject query = new BasicDBObject();

query.put("firstName", "Gopi");

               

DBCursor cursor = collection.find(query);

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DBCursor;
import com.mongodb.MongoClient;
import com.mongodb.DB;
import com.mongodb.DBCollection;

public class FindDocument {

  /* Step 1 : get mongoClient */
  public static MongoClient getMongoClient(){
    MongoClient mongoClient = null;
     try {
       mongoClient = new MongoClient( "localhost" , 27017 );
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
     return mongoClient;
  }
  
  public static void main(String args[]){
    MongoClient mongoClient = getMongoClient();
    
    /* Step 2: Connect to DB */
    DB db = mongoClient.getDB("sample");
    
    /*Step 3 : Get collection */
    DBCollection collection = db.getCollection("employee");
    
    /* Step 4 : Create Query object */
    BasicDBObject query = new BasicDBObject();
    query.put("firstName", "Gopi");
    
    /* Step 5 : Get all documents */
    DBCursor cursor = collection.find(query);
    
    /* Step 6 : Print all documents */
    while(cursor.hasNext()){
      System.out.println(cursor.next());
    }
  }
  
}

Output

{ "_id" : 3.0 , "firstName" : "Gopi" , "lastName" : "Battu"}

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