T-SQL插入觸發器插入，在多個表上如果條件更新

Question

我有幾個問題試圖解決一個SQL觸發器，以自動將用戶設置爲阻止&在另一個表中創建包含日期的塊記錄if其截止日期等於設定的日期。

問題是，當觸發器被插入關閉時，print語句被執行併發生插入，但插入到表中卻沒有，或者update語句？誰能解釋爲什麼？

注意：insert和Update語句在單獨執行時都可以。

Account表

CREATE TABLE [dbo].[Account](
[AccountNo] [int] IDENTITY(1,1) NOT NULL, 
[CustomerNo] [int] NOT NULL, 
[PaymentNo] [int] NULL, 
[CreditNo] [int] NULL, 
[BlockID] [dbo].[number] NULL, 
[Balence] [dbo].[currency] NOT NULL, 
[AmountDue] [dbo].[currency] NOT NULL, 
[DueDate] [dbo].[dates] NULL, 
[AutherisedBy] [nvarchar](50) NOT NULL, 
[DateCreated] [date] NOT NULL, 

BLOCKEDUSER表

CREATE TABLE [dbo].[BlockedUsers](
[BlockID] [int] IDENTITY(1,1) NOT NULL, 
[DateEnforced] [dbo].[dates] NOT NULL, 
[Blocked] [dbo].[switch] NOT NULL, 

TRIGGER

ALTER TRIGGER [dbo].[Add_Blocked_User] 
ON [dbo].[Account] 
FOR INSERT 
AS 
BEGIN 
SET NOCOUNT ON; 

Declare @ID int 
Select @ID = [AccountNo] from inserted 
If(Select [DueDate] from inserted) = '2011-01-01' 

INSERT INTO dbo.BlockedUsers(DateEnforced,Blocked) 
VALUES (GETDATE(),1) 
PRINT 'New Block Date Added' 

UPDATE Account 
Set BlockID = IDENT_CURRENT('BlockID') 
where @ID = @ID 
PRINT 'Account Blocked' 

END 

GO 

工作的完整示例：使用幫助下完成的。

ALTER TRIGGER [dbo].[Add_Blocked_User] 
ON [dbo].[Account] 
AFTER INSERT 
AS 
BEGIN 

SET NOCOUNT ON; 

Declare @ID int 
Select @ID = [AccountNo] from inserted 
If(Select [DueDate] from inserted)Not Between (select CONVERT(date, getdate() - 30)) And (select CONVERT(date, getdate())) 
Begin 
    INSERT INTO dbo.BlockedUsers(DateEnforced,Blocked) 
    VALUES (GETDATE(),1) 
    PRINT 'New Block Date Added' 

    UPDATE Account 
    Set BlockID = (Select Max(BlockID) From BlockedUsers) 
    where [AccountNo] = (Select [AccountNo] from inserted) 
    PRINT 'Account Blocked' 
End 

END 

GO 

Answer 1

在Transact-SQL的IF語句中的條件後，預計單個語句：

IF condition 
    statement; 

如果你想在同一分支執行多條語句，則必須將他們在BEGIN/END「括號「：

IF condition 
BEGIN 
    statement; 
    statement; 
    ... 
END; 

在你的觸發，只有INSERT語句執行根據的(Select [DueDate] from inserted) = '2011-01-01'條件的結果。至於PRINT和UPDATE，它們都無條件執行，即在之後每插入Account。所以，你可能需要添加BEGIN和END周圍INSERT，UPDATE和兩個打印：當兩個或多個行得到插入一條語句

... 
If(Select [DueDate] from inserted) = '2011-01-01' 
BEGIN 
INSERT INTO dbo.BlockedUsers(DateEnforced,Blocked) 
VALUES (GETDATE(),1); 
PRINT 'New Block Date Added'; 

UPDATE Account 
Set BlockID = IDENT_CURRENT('BlockID') 
where @ID = @ID; 
PRINT 'Account Blocked'; 
END; 
... 

Answer 2

你做

FOR INSERT 

你想用

AFTER INSERT, UPDATE 

FOR INSERT告訴SQL服務器，你的觸發將完全取代正常插入操作。 AFTER INSERT告訴Sql Server繼續並插入該行，然後執行此代碼作爲後處理步驟。