Update_db

package test_database;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class Update_db {

     public static void main(String []arg)
     {

        Connection con;
        PreparedStatement ps;
        ResultSet rs;

        try
        {
            Class.forName("com.mysql.jdbc.Driver");
            con=DriverManager.getConnection("jdbc:mysql://localhost/test","root","");
            System.out.println("Database Connected");

            //Update query
            ps=con.prepareStatement("update test_db set Rollno=? where Name=?");
            ps.setString(1,"621615104069");
            ps.setString(2,"Previnkumar");
            ps.executeUpdate();
            System.out.println("Updated Successfully");


        }
        catch(Exception e)
        {
            System.out.println(e);
        }

    }

}