mysql触发器使用笔记

CREATE TRIGGER trigger_name
trigger_time
trigger_event ON tbl_name
FOR EACH ROW
trigger_stmt

trigger_name:标识触发器名称,用户自行指定;
trigger_time:标识触发时机,取值为 BEFORE 或 AFTER;
trigger_event:标识触发事件,取值为 INSERT、UPDATE 或 DELETE;
tbl_name:标识建立触发器的表名,即在哪张表上建立触发器;

trigger_stmt:触发器程序体,可以是一句SQL语句,或者用 BEGIN 和 END 包含的多条语句。


实例

DELIMITER $
create trigger tri_stuInsert after insert
on student for each row
begin
declare c int;
set c = (select stuCount from class where classID=new.classID);
update class set stuCount = c + 1 where classID = new.classID;
end$
DELIMITER 



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