IDEA connects to MySQL database and uses data

一、IDEA连接MySQL数据库

1、First create a new normalJava项目

2、连接数据库

点击右侧DataBase

点击加号,找到MySQL,添加数据库

输入用户名和密码,点击Test Connection

显示连接成功,点击Apply,OK

No database found,点击1 of 7,选择All schemas

All databases are displayed

二、Use database data

1、新建Java类 Test

2、下载MySQL驱动Jar包

方法一：官网下载
官网地址
选择 Plantfrom Independent 版本,下载第二个.

Click Don't log in,只下载

方法二：百度盘
链接：https://pan.baidu.com/s/1yTS6XeTWJ7hm2Z7zPeV_Iw?pwd=qw44
提取码：qw44

3、返回IDEA,新建文件夹lib

解压缩下载的zip文件,把下载好的Jar包放入lib文件夹

4、非常重要（添加到库）

Right-click addedJar包,选择Add as Library（添加到库）

5、编写Test类

import java.sql.*;

public class Test {
    
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
    
        Class.forName("com.mysql.jdbc.Driver");

        // Using my own database test
        String url = "jdbc:mysql://localhost:3306/test";
        
        // 数据库的用户名和密码
        String username = "root";
        String password = "root";


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


        Statement statement = connection.createStatement();

        // SQL语句,Use my owntest数据库下的 boss 表
        String sql = "SELECT * FROM boss";

        ResultSet resultSet = statement.executeQuery(sql);

        // It needs to correspond to the table structure in your own database
        while (resultSet.next()){
    
            System.out.println("id = " + resultSet.getObject("id"));
            System.out.println("name = " + resultSet.getObject("name"));
            System.out.println("age = " + resultSet.getObject("age"));
        }

        resultSet.close();
        statement.close();
        connection.close();
    }
}

boss表结构如下（You need to modify the code for your own table structure）

6、运行主函数,得到数据

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