1.建person表
CREATE TABLE `person` (
`id` int(11) DEFAULT NULL,
`name` varchar(256) DEFAULT NULL,
`sex` char(16) DEFAULT NULL
)
建person_ex
CREATE TABLE `person_ex` (
`id` int(11) DEFAULT NULL,
`name` varchar(256) DEFAULT NULL,
`sex` char(16) DEFAULT NULL
)
2.實現的目標當person新增一條記錄，更新一條記錄或者刪除一條記錄，person_ex中sex字段為M的記錄跟着改變
sql代碼如下：
創建插入觸發器
create trigger person_trigger AFTER insert on person for each row
begin set @x = "hello trigger";
IF new.sex = 'M'
THEN
INSERT INTO person_ex(id,name,sex) VALUES (New.id,new.`name`,new.sex);
END IF;
end;
創建更新觸發器：
create trigger person_trigger_update AFTER UPDATE on person for each row
begin set @x = "trigger UPDATE";
IF new.sex = 'M'
THEN
DELETE from person_ex where person_ex.id = new.id;
INSERT into person_ex SELECT * from person where person.id = new.id;
END IF;
end;
創建刪除觸發器：
create trigger person_trigger_delete AFTER DELETE on person for each row
begin set @x = "trigger DELETE";
DELETE FROM person_ex where person_ex.id = old.id;
end;
3.測試SQL代碼：
INSERT into person (id,name,sex) VALUES (1,'chigo','M')
INSERT into person (id,name,sex) VALUES (2,'Tony','F')
update person set name = 'vara' , sex = 'F' where id = 1
update person set name = 'Tony' , sex = 'M' where id = 1
update person set name = 'vara' , sex = 'M' where id = 1
DELETE from person where id = 1
INSERT into person_ex SELECT * from person where person.id = 1
update person set name = 'vara' , sex = 'F' where id = 1