【mysql】四、mysql的学习---触发器

-- 建表sql

create table emp_logs(
id int(11) not null auto_increment,
opertation varchar(20) not null comment‘操作类型:inset/update/delete‘ ,
opertate_time datetime not null comment‘操作时间‘ ,
opertate_id int(11) not null comment‘操作表的ID‘ ,
opertate_params varchar(500) comment‘操作参数‘ ,
primary key(id)
)engine=innodb default charset=utf8;

2. insert触发器

drop trigger if exists emp_insert_trigger;
delimiter $
create trigger emp_insert_trigger
after insert 
on emp
for each row
begin
  insert into emp_logs(id,opertation,opertate_time,opertate_id,opertate_params) 
  values(null,‘insert‘,now(),new.id,concat(‘插入后(id:‘,new.id,‘,name:‘,new.name,‘,age:‘,new.age,‘,salary:‘,new.salary,‘)‘));
end$
delimiter ;

insert into emp(id,name,age,salary) values(null,‘光明左使‘,30,3500);
select * from emp_logs;

3. update触发器

drop trigger if exists emp_update_trigger;
delimiter $
create trigger emp_update_trigger
after update 
on emp
for each row
begin

insert into emp_logs(id,opertation,opertate_time,opertate_id,opertate_params) 
values(null,‘update‘,now(),new.id,concat(‘修改前(id:‘,old.id,‘,name:‘,old.name,‘,age:‘,old.age,‘,salary:‘,old.salary,‘)‘,
‘ 修改后(id:‘,new.id,‘,name:‘,new.name,‘,age:‘,new.age,‘,salary:‘,new.salary,‘)‘));

end$
delimiter ;

update emp set age=39 where id=3;
select * from emp_logs;

4. delete触发器

drop trigger if exists emp_delete_trigger;
delimiter $
create trigger emp_delete_trigger
after delete 
on emp
for each row
begin

insert into emp_logs(id,opertation,opertate_time,opertate_id,opertate_params) 
values(null,‘delete‘,now(),old.id,concat(‘删除前(id:‘,old.id,‘,name:‘,old.name,‘,age:‘,old.age,‘,salary:‘,old.salary,‘)‘));

end$
delimiter ;

delete from emp where id=4;
select * from emp_logs;

5. 查看触发器

show triggers

6. 删除触发器

drop trigger test.emp_delete_trigger

持续更新！！！

【mysql】四、mysql的学习---触发器

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