关于在数据库中同时使用游标和触发器时的问题

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create trigger Pj_trigger before update on pjxt_majorcourseinfo for
each row begin
DECLARE done INT DEFAULT 0;
declare num varchar(20); – 用于记录每行的学号
declare course_num varchar(20); – 用于记录课程编号 declare semter varchar(20); – 用于记录学期号
declare query_xh cursor for (select XH from pjxt_studentinfo ps where ps.ZY=old.ZYMC); – 创建游标 DECLARE CONTINUE HANDLER FOR
NOT FOUND SET done = 1;-- 必须在游标声明之后声明
set course_num=old.KCBH,semter= old.KKXQ;
if old.PJ=0 AND new.PJ=1
then
open query_xh; – 打开游标
fetch query_xh into num; – 取第一条数据
insert into test values(num);
insert into test values(course_num);
insert into test values(semter);
while done=0
do
insert into test values(num);
insert into pjxt_operatedflag(XH,KCBH,KKXQ) VALUES(num,course_num,semter);
fetch query_xh into num;
end while;
close query_xh; – 关闭游标
end if;
end
drop trigger Pj_trigger