你真的了解觸發(fā)器么 數(shù)據(jù)實(shí)時(shí)同步更新問(wèn)題剖析

--我們要建觸發(fā)器的動(dòng)態(tài)表
Create table Table_a
(
ID int identity(1,1),--自增ID
Content nvarchar(50),
UpdateIDForTrigger int
)

Create TRIGGER [dbo].[Table_a_Ins]
ON [dbo].[Table_a]
AFTER INSERT
AS
BEGIN
declare @ID int
set @ID=(select ID from inserted)
--更新Table_a表中的UpdateIDForTrigger字段的值，為了能更明顯的看出實(shí)時(shí)執(zhí)行的效果
UPDATE Table_a
SET UpdateIDForTrigger = (@ID+10)--為了能看出不同，就直接將比ID大10的值作為變量賦值
WHERE ID = @ID;
END

--給信息表添加數(shù)據(jù)
insert into Table_a(Content) values('信息一');
insert into Table_a(Content) values('信息二');

select * from Table_a

--基本信息表
Create table Table_Info
(
ID int identity(1,1),
Content nvarchar(50)
)

insert into Table_Info(Content) values('信息三');
insert into Table_Info(Content) values('信息四');
insert into Table_Info(Content) values('信息五');
insert into Table_Info(Content) values('信息六');
insert into Table_Info(Content) values('信息七');
insert into Table_Info(Content) values('信息八');
insert into Table_Info(Content) values('信息九');
insert into Table_Info(Content) values('信息十');

insert into Table_a(Content)
select Content from Table_Info

Alter TRIGGER [dbo].[Table_a_Ins]
ON [dbo].[Table_a]
AFTER INSERT
AS
BEGIN
select ID from inserted;
END

Alter TRIGGER [dbo].[Table_a_Ins]
ON [dbo].[Table_a]
AFTER INSERT
AS
BEGIN
declare @ID int
declare cur_Insert cursor
for
select ID from inserted
open cur_Insert
fetch next from cur_Insert into @ID
while @@fetch_status=0
begin
UPDATE Table_a
SET UpdateIDForTrigger = (@ID+10)--為了能看出不同，就直接將比ID大10的值作為變量賦值
WHERE ID = @ID;
fetch next from cur_Insert into @ID
end
close cur_Insert
deallocate cur_Insert
END

insert into Table_a(Content)
select Content from Table_Info;
select * from Table_a;

Alter TRIGGER [dbo].[Table_a_Ins]
ON [dbo].[Table_a]
AFTER INSERT
AS
BEGIN
UPDATE Table_a
SET UpdateIDForTrigger =inserted.ID+10
FROM inserted
Where Table_a.ID=inserted.ID
END