为什么我的控制台什么都没输出

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

public class db {

private static final String url = "jdbc:mysql://127.0.0.1:3306/imooc";

private static final String user = "root";

private static final String password = "123";

public static void main(String[] args) throws Exception {

//1、加载mysql驱动

Class.forName("com.mysql.jdbc.Driver");

//2、获得数据库连接

Connection connection=DriverManager.getConnection(url ,user , password);

//3、通过连接操作数据库,实现增删改查

Statement statement=connection.createStatement();

//4、执行sql语句

ResultSet re = statement.executeQuery("select user_name,age from imooc_goddess;");

while(re.next()){

System.out.println(re.getString("user_name")+","+re.getInt("age"));

}

}

}