如何将mysql表的变量放在列表中？

DELIMITER //

CREATE PROCEDURE getVariableList()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE var_value VARCHAR(255);
    DECLARE cur CURSOR FOR SELECT column_name FROM your_table;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
    
    SET @variable_list = '';
    
    OPEN cur;
    
    read_loop: LOOP
        FETCH cur INTO var_value;
        IF done THEN
            LEAVE read_loop;
        END IF;
        
        SET @variable_list = CONCAT(@variable_list, var_value, ',');
    END LOOP;
    
    CLOSE cur;
    
    SELECT @variable_list AS variable_list;
END //

DELIMITER ;

CALL getVariableList();