Question

我正在编写一个触发器，如下所示，该触发器从表中获取一个Auto Increment变量的值。想法是从另一个保留批准ID的表中检查该值。如果找到匹配项，则该交易被允许，否则被拒绝。

令我惊讶的是，触发器本身内，该字段的值根据捕获值的位置而变化。

以下是触发脚本。当在第一个RAISERROR中显示AutoIndex的值时，它保持稳定，但是在第二个实例中（即在IF块中）引用相同的值时，它会不断变化。请告诉我我要去哪里错了。

ALTER TRIGGER [dbo].[WIZ_TRG_DOC_APPROVAL]
ON [dbo].[InvNum]
FOR INSERT, UPDATE
AS
BEGIN
DECLARE @AID AS INT
DECLARE @APRV AS BIT
DECLARE @Msg AS VARCHAR(100)
DECLARE @DOCST AS INT
DECLARE @ORD AS VARCHAR(10)
DECLARE @INV AS VARCHAR(10)

SELECT @AID = AutoIndex, @DOCST = DocState FROM inserted

Set @Msg = 'This document is not fully authorised. ' + ' AutoIndex = ' + convert(varchar(10), @AID)
        RAISERROR (@Msg, 16, 1);

IF @DOCST = 4
BEGIN
    IF NOT EXISTS (SELECT Dir__Approve FROM WIZ_DOC_APPROVAL WHERE DocIndex = @AID)
        SET @APRV = 0  --Approval record has not been created yet
    ELSE 
        SELECT @APRV = ISNULL(Dir__Approve, 0) FROM WIZ_DOC_APPROVAL WHERE DocIndex = @AID

    IF @APRV <> 1
    BEGIN
        Set @Msg = 'This document is not fully authorised. ' 
                    + ' AutoIndex = ' + convert(varchar(10), @AID)
        RAISERROR (@Msg, 16, 1);
        ROLLBACK;
    END
END
END

触发器内部的自动增量变量值更改

0 个答案: