触发器的应用

--当在“出货表_明细”增、删、改时，相应地在“订单表_明细”对已交货数量和未交货数量作出修改。
Create trigger tr_出货表_明细
on 出货表_明细
For DELETE,INSERT,UPDATE
as
Declare @JiaoHuo varchar(20)
Begin
 Set @JiaoHuo = (Select Sum(交货数量) from 出货表_明细 Group by 序号 Having 序号 = (Select 序号 From Deleted))
 Set @JiaoHuo = ISNULL(@JiaoHuo,(Select Sum(交货数量) from 出货表_明细 Group by 序号 Having 序号 = (Select 序号 From Inserted)))
        Set @JiaoHuo = ISNULL(@JiaoHuo,0)
 UPDATE N SET 已交货数量 = @JiaoHuo, 未交货数量 = N.订购数量 - @JiaoHuo
                From 订单表_明细 AS N INNER Join Deleted AS D
      ON N.序号 = D.序号
End


--当“订单表_明细”中增、删、改时、判断该笔订单的未交货数量合计是否为0，修改“订单表”的订单状态为“已完成”，否则为“未完成”
Create trigger tr_Status
ON 订单表_明细
FOR INSERT,UPDATE,DELETE
AS
Declare @Order varchar(20)
 Begin
         Set @Order = (Select 订单号 from Deleted)
         Set @Order = ISNULL(@Order,(Select 订单号 from Inserted))
         IF(Select Sum(未交货数量) From 订单表_明细 Group by 订单号 Having 订单号 = @Order)= 0 
              Begin 
                   UPDATE 订单表 Set 订单状态 = '已完成',完成日期 = GetDate() Where 订单号 = @Order
              End
         Else
              Begin  
                   UPDATE 订单表 Set 订单状态 = '未完成',完成日期 = NUll Where 订单号 = @Order
              End
 End


======================================================================
--出货表_明细
CREATE TABLE [出货表_明细] (
 [序号] [int] NULL ,
 [订单号] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [ID] [int] IDENTITY (1, 1) NOT NULL ,
 [出货单号] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [料号] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [品名_1] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [品名_2] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [批号] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [单位] [varchar] (10) COLLATE Chinese_PRC_CI_AS NULL ,
 [规格型号] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [交货数量] [int] NULL ,
 [交货情况] [varchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
 [客户要求交货期] [datetime] NULL ,
 [预交日期] [datetime] NULL ,
 [交货日期] [datetime] NULL ,
 [sysRowInfo] [text] COLLATE Chinese_PRC_CI_AS NULL ,
 CONSTRAINT [PK_出货表_明细] PRIMARY KEY  CLUSTERED
 (
  [ID]
 )  ON [PRIMARY] ,
 CONSTRAINT [FK_出货表_出货表_明细] FOREIGN KEY
 (
  [出货单号]
 ) REFERENCES [出货表] (
  [出货单号]
 ) ON DELETE CASCADE  ON UPDATE CASCADE
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO


--订单表
CREATE TABLE [订单表] (
 [订单号] [varchar] (20) COLLATE Chinese_PRC_CI_AS NOT NULL ,
 [客户编号] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [客户名称] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [下单日期] [datetime] NULL ,
 [签收日期] [datetime] NULL ,
 [接单业务员] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [客户要求完成日期] [datetime] NULL ,
 [完成日期] [datetime] NULL ,
 [订单状态] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [总金额] [money] NULL ,
 [出货人] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [收货地址] [varchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
 [收货人] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [备注] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL ,
 [sysRowInfo] [text] COLLATE Chinese_PRC_CI_AS NULL ,
 CONSTRAINT [PK_订单表] PRIMARY KEY  CLUSTERED
 (
  [订单号]
 )  ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

--订单表_明细
CREATE TABLE [订单表_明细] (
 [序号] [int] IDENTITY (1, 1) NOT NULL ,
 [订单号] [varchar] (20) COLLATE Chinese_PRC_CI_AS NOT NULL ,
 [料号] [varchar] (20) COLLATE Chinese_PRC_CI_AS NULL ,
 [品名_1] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [品名_2] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [批号] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [单位] [varchar] (10) COLLATE Chinese_PRC_CI_AS NULL ,
 [规格型号] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
 [订购数量] [int] NULL ,
 [已交货数量] [int] NULL ,
 [未交货数量] [int] NULL ,
 [单价] [money] NULL ,
 [合计金额] [money] NULL ,
 [客户要求交货期] [datetime] NULL ,
 [预交日期] [datetime] NULL ,
 [sysRowInfo] [text] COLLATE Chinese_PRC_CI_AS NULL ,
 CONSTRAINT [PK_订单表_明细] PRIMARY KEY  CLUSTERED
 (
  [序号]
 )  ON [PRIMARY] ,
 CONSTRAINT [FK_订单表_订单表_明细] FOREIGN KEY
 (
  [订单号]
 ) REFERENCES [订单表] (
  [订单号]
 ) ON DELETE CASCADE  ON UPDATE CASCADE
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO