lr连接mysql方法

import java.sql.*;

public class MySQLConnection {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try {
            // 加载MySQL驱动
            Class.forName("com.mysql.jdbc.Driver");
            // 配置数据库连接信息
            String url = "jdbc:mysql://localhost:3306/testdb";
            String user = "root";
            String password = "password";
            // 建立连接
            conn = DriverManager.getConnection(url, user, password);
            // 创建Statement对象
            stmt = conn.createStatement();
            // 执行SQL查询
            ResultSet rs = stmt.executeQuery("SELECT * FROM users");
            // 处理查询结果
            while (rs.next()) {
                System.out.println(rs.getString("username"));
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}