JAVAmysql查询变量

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

public class MySQLVariableExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password);
             Statement stmt = conn.createStatement()) {

            // 查询用户定义变量
            String query = "SELECT @myVariable";
            ResultSet rs = stmt.executeQuery(query);

            if (rs.next()) {
                System.out.println("Value of @myVariable: " + rs.getObject(1));
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}