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如何在SQL Server 2005中模拟删除前触发器

更新时间:2023-02-05 10:25:45

您可以使用INSTEAD OF触发器。它在(代替)实际的删除之前触发,因此[one_two]中的链接记录必须仍然存在。

You can use an INSTEAD OF trigger. It fires before (replaces) the actual delete, therefore the linked record in [one_two] must still exist.

create table [one] (one_id int not null primary key)
create table [two] (two_id int not null primary key)
create table [one_two] (one_id int, two_id int references two(two_id) on delete cascade)
GO
CREATE trigger t_del_two
on two
instead of delete
as
begin
SET NOCOUNT ON
DECLARE @Statement NVARCHAR(max)
SET @Statement = ''
SELECT @Statement = @Statement + N'EXEC [MyProc] ''' + CAST([one_two].[one_id] AS VARCHAR(36)) + '''; '
FROM deleted
JOIN [one_two] ON deleted.[two_id] = [one_two].[two_id]

PRINT (@Statement)
--EXEC (@Statement)

-- carry out the actual delete
DELETE TWO WHERE two_id in (SELECT two_id from deleted)
end
GO

一些样本值

insert into one select 1
insert into one select 2
insert into one select 3
insert into two select 11
insert into two select 12
insert into two select 13
insert into one_two select 1,11
insert into one_two select 1,13
insert into one_two select 2,13

现在进行测试

delete two where two_id=13