jmeter连接mysql数据库

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MySQLConnection {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            // 加载 JDBC 驱动程序
            Class.forName("com.mysql.cj.jdbc.Driver");

            // 连接字符串
            String url = "jdbc:mysql://localhost:3306/mydatabase?user=root&password=root";
            conn = DriverManager.getConnection(url);

            // 创建 Statement 对象
            stmt = conn.createStatement();

            // 执行查询
            String sql = "SELECT * FROM mytable";
            rs = stmt.executeQuery(sql);

            // 处理结果集
            while (rs.next()) {
                System.out.println(rs.getString("columnName"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}