java mysql

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

public class helloworld {

	public static void main(String[] args) throws ClassNotFoundException, SQLException {
		
		Class.forName("com.mysql.jdbc.Driver");
		Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydata", "root", "");
		System.out.println(con);
		
		String sql = "select * from student";
		PreparedStatement pst = con.prepareStatement(sql);
		
		ResultSet rs = pst.executeQuery();
		while(rs.next())
		{
			int id = rs.getInt("id");//rs.getInt(1)
			String name = rs.getString("name");//rs.getString(2)
			int age = rs.getInt("age");//rs,getInt(3)
			System.out.printf("%d %s %d\n", id, name, age);
		}
		rs.close();
		pst.close();
		con.close();
	}

}