jdbc连接

package com.song.testjdbc;

import java.sql.*;

public class test {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //导入驱动
        Class.forName("com.mysql.cj.jdbc.Driver");
        //连接信息 用户信息url
        String url = "jdbc:mysql://localhost:3306/java_test?useUnicode=true&characterEncoding=utf8&useSSL=true";
        String name = "root";
        String pwd = "123456";
        //连接成功 返回数据库对象 connection代表数据
        Connection connection = DriverManager.getConnection(url, name, pwd);
        //执行sql statement执行sql对象
        Statement statement = connection.createStatement();
        String sql = "SELECT * FROM tb_user";
        ResultSet resultSet = statement.executeQuery(sql);
        while (resultSet.next()){
            System.out.println("id" + resultSet.getObject("userid"));
            System.out.println("id" + resultSet.getObject("username"));
            System.out.println("id" + resultSet.getObject("userPwd"));
            System.out.println("id" + resultSet.getObject("userAge"));
        }
        //释放连接
        resultSet.close();
        statement.close();
        connection.close();
    }
}