建立触发器后，不能像表中插入数据，是什么原
USE [cai2016]
GO
/****** Object: Trigger [dbo].[trigger_yunum] Script Date: 2017/3/29 17:30:30 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
alter trigger [dbo].[trigger_yunum]
on [dbo].[newmoo_case_cgxd]
for insert
as
BEGIN
DECLARE @id bigint SELECT @id = id FROM INSERTED
DECLARE @purchase_id varchar SELECT @purchase_id = purchase_id FROM INSERTED
DECLARE @slength nvarchar SELECT @slength = slength FROM INSERTED
DECLARE @engname nvarchar SELECT @engname = engname FROM INSERTED
DECLARE @swidth nvarchar SELECT @swidth = swidth FROM INSERTED
DECLARE @kehu_id bigint SELECT @kehu_id = kehu_id FROM INSERTED
DECLARE @caseid bigint select @caseid =caseid FROM INSERTED
DECLARE @productnum int SELECT @productnum = productnum FROM INSERTED
DECLARE @pay numeric SELECT @pay = pay FROM INSERTED
DECLARE @costprice numeric SELECT @costprice = costprice FROM INSERTED
DECLARE @pid_p bigint select @pid_p =pid_p FROM INSERTED
DECLARE @cz int SELECT @cz = cz FROM INSERTED
DECLARE @productRemarks nvarchar SELECT @productremarks = productremarks FROM INSERTED
DECLARE @weight numeric SELECT @weight = weight FROM INSERTED
Update a set a.overnum=(select a.id, a.overnum, a.oknum, a.yunum, b.caseid, b.productnum, b.ischeck, sum(b.productnum) from newmoo_case a, newmoo_case_cgxd b where b.caseid=a.id and b.ischeck=3)
end
use test
go
-- 表1(id,productnum),建立几个测试数据
if object_id(‘表1‘) is null
begin
create table 表1(id int,productnum numeric(10,2))
insert into 表1
select 1001,10.5 union all
select 1001,20.5 union all
select 1001,30.5 union all
select 1001,30.5 union all
select 1002,20.2 union all
select 1002,30.2
end
-- select * from 表1
-- 表2(id,overnum,upd),建立几个测试数据，汇总表
if object_id(‘表2‘) is null
begin
create table 表2(id int,overnum numeric(10,2),upd datetime )
insert into 表2
select 1001,0.0,getdate() union all
select 1002,0.0,getdate()
end
-- select * from 表2
go
-- 上面的是测试数据，下面开始建立 触发器
alter trigger [dbo].[tr_表1] --第1次运行时，create,
on [dbo].[表1]
for insert
as
begin
declare @id int
select @id=id from inserted
update a set a.overnum=b.productnum,upd=getdate()
from 表2 a,(select id,productnum=sum(productnum) from 表1 where [email protected] group by id) b
where a.id=b.id
end
go
-- 测试往“表1”插入数据，看表2是否更新,查看前后变化
select * from 表2
go
insert into 表1(id,productnum) values(1002,30.5)
select * from 表2