QueryBuilderClass.Field_selection_mongo.java Source code

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Here is the source code for QueryBuilderClass.Field_selection_mongo.java

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package QueryBuilderClass;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.QueryBuilder;
import java.net.UnknownHostException;
import java.util.Random;

/**
 *
 * @author vedangjoshi
 */
public class Field_selection_mongo {

    /**
     * @param args the command line arguments
     * @throws java.net.UnknownHostException
     */
    public static void main(String[] args) throws UnknownHostException {

        MongoClient client = new MongoClient("localhost", 27017);
        DB myDB = client.getDB("m101");
        DBCollection collection = myDB.getCollection("Sample3");

        /**
         * random_number field generates random numbers 
        */
        Random random_numbers = new Random();

        collection.drop();

        for (int i = 0; i < 10; i++) {
            collection.insert(new BasicDBObject("x", random_numbers.nextInt(100))
                    .append("y", random_numbers.nextInt(100)).append("z", random_numbers.nextInt(200)));
        }

        DBObject query = QueryBuilder.start("x").greaterThan(10).lessThan(70).and("y").greaterThan(10).lessThan(70)
                .get();

        DBCursor cursor = collection.find(query, new BasicDBObject("y", true).append("_id", false));

        try {
            while (cursor.hasNext()) {
                DBObject dBObject = cursor.next();
                System.out.println(dBObject);
            }
        } finally {
            cursor.close();
        }

    }
}