登录mysql数据库的程序

import java.sql.*;

public class MySQLExample {
    public static void main(String[] args) {
        Connection conn = null;
        try {
            // 注册数据库驱动
            Class.forName("com.mysql.jdbc.Driver");
            
            // 建立数据库连接
            String url = "jdbc:mysql://localhost:3306/mydatabase";
            String username = "root";
            String password = "password";
            conn = DriverManager.getConnection(url, username, password);
            
            // 执行SQL语句
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM mytable");
            
            // 处理查询结果
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                System.out.println("ID: " + id + ", Name: " + name);
            }
            
            // 关闭数据库连接
            rs.close();
            stmt.close();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import pymysql

# 建立数据库连接
conn = pymysql.connect(host='localhost', port=3306, user='root', password='password', db='mydatabase')

try:
    # 执行SQL语句
    with conn.cursor() as cursor:
        sql = 'SELECT * FROM mytable'
        cursor.execute(sql)
        result = cursor.fetchall()
        
        # 处理查询结果
        for row in result:
            id = row[0]
            name = row[1]
            print('ID:', id, ', Name:', name)

finally:
    # 关闭数据库连接
    conn.close()