SQL Server INSERT/UPDATE觸發器連接日期字符串

Question

從未寫過觸發器。

需要插入和更新時檢查日期的觸發器，如果​​日期大於25日，則將該日期設置回該月的25日。

現在我正在嘗試構建@newDate，我不知道該怎麼做。

目前代碼：

CREATE TRIGGER [dbo].[setASDate] 
    ON [dbo].[AutoShip] 
    AFTER UPDATE, INSERT 
AS 
BEGIN 
-- SET NOCOUNT ON added to prevent extra result sets from 
-- interfering with SELECT statements. 
SET NOCOUNT ON; 

DECLARE @DistID INT; 
DECLARE @date INT; 
DECLARE @month INT; 
DECLARE @year INT; 

IF UPDATE(DateNextShipment) 
BEGIN 
    DECLARE @newDate datetime; 

    SELECT TOP 1 @DistID = DistID FROM INSERTED 
    SELECT TOP 1 @date = DATEPART(d, DateNextShipment) FROM INSERTED 
    SELECT TOP 1 @month = CONVERT(varchar(2),DATEPART(mm, DateNextShipment)) FROM INSERTED 
    SELECT TOP 1 @year = CONVERT(varchar(4),DATEPART(yyyy, DateNextShipment)) FROM INSERTED 
    @newDate = CONVERT(datetime,@year + '-' + @month + '-25') 

    If @date > 25 
    BEGIN  
     UPDATE AutoShip 
     SET DateNextShipment = @newDate, Day = 25 
     WHERE DistID = @DistID 
    END  
END 
END 

編輯 - 更新了代碼

Answer 1

聲明變量@date和varchar類型的@month，然後用它作爲：

SELECT TOP 1 @date = DATEPART(d, DateNextShipment) FROM INSERTED 
SELECT TOP 1 @year= convert(varchar(4),DATEPART(yyyy, DateNextShipment)) FROM INSERTED 
SELECT TOP 1 @month = convert(varchar(2),DATEPART(mm, DateNextShipment)) FROM INSERTED 
@newDate = convert(datetime,@year+'-'+@month+'-'+'25')