sql-server - SQL Server INSERT/UPDATE 触发器连接日期字符串

Question

以前从未写过触发器。

需要有一个检查日期的插入和更新触发器，如果​​日期大于 25 日，则将该日期设置回该月的 25 日。

现在我正在尝试构建@newDate，但我不知道该怎么做。

当前代码：

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

编辑 - 更新了代码

Answer 1

声明 varchar 类型的变量 @date 和 @month，然后将其用作：

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')