用于将整行写入另一个表的 SQL 更新触发器

Question

我昨天发布了一个问题，这是相关的。我有一张名为 People_Master 的表

CREATE TABLE [dbo].[People_Master](
[ID] [int] IDENTITY(900001,1) NOT NULL,
[Email] [nvarchar](50) NULL,
[FirstName] [nvarchar](50) NULL,
[uac] [int] NULL,
[department] [nvarchar](50) NULL,
 CONSTRAINT [PK_People_Master] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)

我还创建了另一个名为 People_Delta 的表

CREATE TABLE [dbo].[People_Delta](
[ID] [int] NOT NULL,
[Email] [nvarchar](50) NULL,
[FirstName] [nvarchar](50) NULL,
[uac] [int] NULL,
[Department] [nvarchar](50) NULL,
[change_type] [nvarchar](10) NULL
) ON [PRIMARY]

请注意，我在 People_Delta 中多了一个名为“change_type”的列

现在我正在尝试为 People_Master 编写一个更新触发器，这样当它发生更新时，它应该将整行写入 People_Delta 并将 change_type 设置为“Modify”。

这是我写的触发器（我不擅长 SQL。哈哈！）

CREATE TRIGGER [dbo].[TR_Update] 
   ON  [dbo].[People_Master]
   AFTER Update
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    Declare @RowCount int
    Declare @ID int

    --Create a temp table to hold the inserted data.
    Declare @TempTable As Table
    (
        [ID] [int],
        [Email] [nvarchar](50) ,
        [FirstName] [nvarchar](50),
        [uac] [int] ,
        [department] [nvarchar](50)     
    )

    Insert Into @TempTable (ID,Email,FirstName,uac,department)
    select 
        ID,
        Email,
        FirstName,
        uac,
        department
    from
        inserted    


    select @ID = ID from inserted

    --check if the row for this ID doesnt exist already.
    Select @RowCount=COUNT(*) from People_Delta where People_Delta.ID = @ID and People_Delta.change_type = 'Modify';

    if(@RowCount = 0)
    Begin
        Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
        values (@TempTable.ID,@TempTable.Email,@TempTable.FirstName,@TempTable.uac,@TempTable.department,'Modify');
    END

END

GO

但是，当我执行此触发器时，我收到以下错误：

Msg 137, Level 16, State 1, Procedure TR_Update, Line 50
Must declare the scalar variable "@TempTable".
Msg 137, Level 16, State 1, Procedure TR_Update, Line 50
Must declare the scalar variable "@TempTable".
Msg 137, Level 16, State 1, Procedure TR_Update, Line 50
Must declare the scalar variable "@TempTable".
Msg 137, Level 16, State 1, Procedure TR_Update, Line 50
Must declare the scalar variable "@TempTable".
Msg 137, Level 16, State 1, Procedure TR_Update, Line 50
Must declare the scalar variable "@TempTable".

我做错了什么？请帮忙！ GT。

Answer 1

试试这个触发器。

更改了这个插入查询

 Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
        values (@TempTable.ID,@TempTable.Email,@TempTable.FirstName,@TempTable.uac,
                @TempTable.department,'Modify');

到

Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
        select  ID, Email,FirstName, uac, department, 'Modify'    from
        inserted  

更新的触发器：

CREATE TRIGGER [dbo].[TR_Update] 
   ON  [dbo].[People_Master]
   AFTER Update
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    Declare @ID int

    select @ID = ID from inserted

    If NOT EXISTS(Select People_Delta.ID from People_Delta where People_Delta.ID = @ID 
                       and People_Delta.change_type = 'Modify')
    BEGIN
         Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
          select  ID, Email,FirstName, uac, department, 'Modify'    from
          inserted  
    END
END