Trigger-demo--新增 更新 和删除的一个 例子

--create table persons

drop table if EXISTS `persons`;

CREATE TABLE `persons`(

P_id int(5) primary key,

LastName varchar(255),

FirstName varchar(255),

Address varchar(255),

City varchar(255)

);

--create table person_record to record the persons's changed

drop table if exists `person_record`;

CREATE table person_record(

R_id int(5) AUTO_INCREMENT PRIMARY KEY,

P_id int(5),

LastName varchar(255),

FirstName varchar(255),

Address varchar(255),

City varchar(255),

Operate_type varchar(10)

);

--create trigger insert, update, delete for persons

DROP TRIGGER IF EXISTS `persons_insert_trigger`;

DROP TRIGGER IF EXISTS `persons_update_trigger`;

DROP TRIGGER IF EXISTS `persons_delete_trigger`;

CREATE TRIGGER persons_insert_trigger AFTER INSERT ON persons for each row

begin

insert into person_record(P_id,LastName,FirstName,Address,City,Operate_type)

values (new.P_id,new.LastName,new.FirstName,new.Address,new.City,'CREATE');

end;

create trigger person_update_trigger after update on persons for each row

begin

insert into person_record(P_id,LastName,FirstName,Address,City,Operate_type)

values (old.P_id,new.LastName,new.FirstName,new.Address,new.City,'UPDATE');

end;

create trigger person_delete_trigger after delete on persons for each row

begin

insert into person_record(P_id,LastName,FirstName,Address,City,Operate_type)

values (old.P_id,old.LastName,old.FirstName,old.Address,old.City,'DELETE');

end;