关于数据库的触发器的使用

if OBJECT_ID('Data') is not null
drop table data
go


create table Data (
DataID int identity primary key,
ChildID int not null,
Time int not null,
Data varchar(255) not null,
Type tinyint not null,
Status varchar(255) null
)
go
create trigger mydata on Data for insert
as
begin
declare @status varchar(255),@dataID int
select @dataID=DataID from inserted
set @status=''
while(1=1)

begin
if (select data from Data where DataID=@dataID and Type=1)>37.0
set @status='发烧'
if(select data from Data where DataID=@dataID and Type=2)<6
set @status=@status+'睡眠质量差'
end
update Data set status=@status where DataID=@dataID
end

INSERT INTO Data(ChildID,Time,Data,Type ) VALUES(2,1429407000,40.1,1)

select * from data

哪位大神能告诉我有没有错误，为什么执行查询就一直在没有命令成功。。急

while(1=1)
不能这样写，你那死循环了
WHILE(@@FETCH_STATUS=0)

完全可以做到: create trigger del on studen instate of delete as begin delete from student where existe(select a.xuehao,b.jiaofei from deleted a,jiaofei b where a.xuehao=b.xuehao and a.xuehao=student.xuehao and b.jiaofei='未交') delete from info where existe(select a.xuehao,b.jiaofei from deleted a,jiaofei b where a.xuehao=b.xuehao and a.xuehao=info.xuehao and b.jiaofei='未交') delete from jiaofei where existe(select xuehao from deleted where deleted.xuehao=jiaofei.xuehao and jiaofei.jiaofei='未交') end