在MySQL環(huán)境下面，建立相關(guān)觸發(fā)器，在兩個(gè)表之間相關(guān)sql，希望能幫到大家
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(shí)現(xiàn)的目標(biāo)當(dāng)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的記錄跟著改變
sql代碼如下：
創(chuàng)建插入觸發(fā)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(chuàng)建更新觸發(fā)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(chuàng)建刪除觸發(fā)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 ;