将数据插入另一个表时触发以更新带有时间戳的表

Question

我对触发器很陌生。在这里需要帮助。

我有两张桌子，[dbo].[Demand_Request] 和 [dbo].[Modified_Demand_Request]。

CREATE TABLE [dbo].[Demand_Request] 
(
    [CASE_ID] [INT] NULL,
    [TE_PART_NUMBER] [NVARCHAR](50) NULL,
    [VALUE] [FLOAT] NULL,
    [DEMAND_DATE] [DATETIME] NULL
) 

CREATE TABLE [dbo].[Modified_Demand_Request] 
(
    [CASE_ID] [INT] NULL,
    [TE_PART_NUMBER] [NVARCHAR](50) NULL,
    [VALUE] [FLOAT] NULL,
    [DEMAND_DATE] [DATETIME] NULL,
    [Modified_On] [DATETIME] NULL
) 

当数据插入[dbo].[Demand_Request] 时，我想将相同的数据与时间戳一起添加到表[dbo].[Modified_Demand_Request] 中。

下面是我的触发器，但它不起作用：

CREATE TRIGGER [dbo].[Modified_Demand_Request1]
ON [dbo].[Demand_Request]
AFTER UPDATE
AS
     INSERT INTO [dbo].[Modified_Demand_Request] ([CASE_ID], [TE_PART_NUMBER],[VALUE], [DEMAND_DATE], [Modified_On])
         SELECT 
             [CASE_ID], [TE_PART_NUMBER], [VALUE],
             [DEMAND_DATE], GETDATE()
         FROM 
             INSERTED

Answer 1

我想知道您是如何插入数据的。我尝试了与下面相同的方法（使用“FOR INSERT”触发器）并且能够获取 Modified_Demand_Request 表中的数据。

    insert into [Demand_Request] values(1,'Test',1.0,GETDATE())
    insert into [Demand_Request] values(2,'Test1',1.0,GETDATE())
    insert into [Demand_Request] values(3,'Test2',1.0,GETDATE())
    insert into [Demand_Request] values(14,'Test2',1.0,GETDATE())

Answer 2

试试这个FOR INSERT

Create Trigger [dbo].[Modified_Demand_Request1]
   on [dbo].[Demand_Request]
   FOR INSERT
   AS
     Insert Into[dbo].[Modified_Demand_Request] ([CASE_ID],[TE_PART_NUMBER],[VALUE],[DEMAND_DATE],[Modified_On])
       SELECT [CASE_ID],[TE_PART_NUMBER],[VALUE],[DEMAND_DATE],GETDATE()
       FROM INSERTED

用于演示REXTESTER

额外参考：Firing Trigger for Bulk Insert