MySQL存储过程的问题

Question

在使用MySQL的存储过程时，系统报错，不知道原因。
程序如下：

USE db_school;
DELIMITER $$
CREATE PROCEDURE sp_sumofrow(OUT ROWS INT) 
BEGIN 
  DECLARE sno CHAR;
  DECLARE FOUND BOOLEAN DEFAULT TRUE;
  DECLARE cur CURSOR FOR
    SELECT studentNo FROM tb_student;
  DECLARE CONTINUE HANDLER FOR NOT FOUND
    SET FOUND = FALSE;
  SET ROWS = 0;
  OPEN cur;
  FETCH cur INTO sno;
  WHILE FOUND DO
    SET ROWS = ROWS + 1;
    FETCH cur INTO sno;
   END WHILE;
   CLOSE cur;
END $$
DELIMITER ;

Answer 1

代码颜色已经给了提示，rows found都是mysql中的关键字，用作变量名称不合法。