Question

运行简单的更新语句时，我一直收到此错误。

Msg 16922，Level 16，State 1，Procedure TRG_MEM_BALANCE_AWW，Line 72
光标提取：不允许从数据类型datetime到decimal的隐式转换。

这是我的触发器代码。我没有看到错误转换的内容？

ALTER TRIGGER [dbo].[TRG_MEM_BALANCE_AWW]
ON [dbo].[DETAILRENTAL]
AFTER INSERT, DELETE, UPDATE
AS 
BEGIN
    IF(EXISTS(SELECT * FROM inserted) 
       AND
       EXISTS(SELECT * FROM deleted))
    BEGIN
        DECLARE CURSORFORUPDATE CURSOR FOR
            SELECT 
                I.RENT_NUM, I.DETAIL_DUEDATE, I.DETAIL_RETURNDATE, 
                I.DETAIL_DAILYLATEFEE, D.DETAIL_DUEDATE, 
                D.DETAIL_RETURNDATE, D.DETAIL_DAILYLATEFEE
            FROM 
                inserted I 
            INNER JOIN 
                DELETED D ON I.Rent_Num = D.Rent_Num 
                          AND I.Vid_Num = D.Vid_Num

        DECLARE @RENT_NUM INT
        DECLARE @RETURN_DATE_NEW DATETIME
        DECLARE @DUE_DATE_OLD DATETIME
        DECLARE @DUE_DATE_NEW DATETIME
        DECLARE @RETURN_DATE_OLD DATETIME
        DECLARE @DAILY_LATE_FEE_NEW DECIMAL(5,2)
        DECLARE @DAILY_LATE_FEE_OLD DECIMAL(5,2)
        DECLARE @LATE_FEE_PRIOR DECIMAL(5,2)
        DECLARE @LATE_FEE_AFTER DECIMAL(5,2)
        DECLARE @CHANGE DECIMAL (5,2)

        OPEN CURSORFORUPDATE 

        FETCH NEXT FROM CURSORFORUPDATE INTO @RENT_NUM, @DUE_DATE_NEW, @RETURN_DATE_NEW, @DAILY_LATE_FEE_NEW, @DUE_DATE_OLD, @RETURN_DATE_OLD, @DAILY_LATE_FEE_OLD

        WHILE (@@FETCH_STATUS = 0)
        BEGIN

--A
IF(@RETURN_DATE_OLD > @DUE_DATE_OLD)

BEGIN

    SELECT @LATE_FEE_PRIOR = DATEDIFF(DAY, @DUE_DATE_OLD, @RETURN_DATE_OLD) * @DAILY_LATE_FEE_OLD

    END
    ELSE
        SELECT @LATE_FEE_PRIOR = 0
--B
    IF(@RETURN_DATE_NEW > @DUE_DATE_NEW) 
    BEGIN
    SELECT @LATE_FEE_AFTER = DATEDIFF(DAY, @DUE_DATE_NEW, @RETURN_DATE_NEW) * @DAILY_LATE_FEE_NEW

    END
    ELSE
        SELECT @LATE_FEE_AFTER = 0

--C
    SELECT @CHANGE = @LATE_FEE_AFTER - @LATE_FEE_PRIOR

--D
    IF(@CHANGE <> 0)
    BEGIN
    DECLARE @MEM_NUM INT
    SELECT @MEM_NUM = M.Mem_Num
    FROM RENTAL R INNER JOIN MEMBERSHIP M ON R.MEM_NUM = M.MEM_NUM AND R.RENT_NUM = @RENT_NUM

    UPDATE MEMBERSHIP
    SET Mem_Balance = MEM_BALANCE + @CHANGE
    WHERE Mem_Num = @MEM_NUM 

    FETCH NEXT FROM CURSORFORUPDATE
    INTO @RENT_NUM, @DUE_DATE_NEW, @DUE_DATE_OLD, @RETURN_DATE_NEW, @RETURN_DATE_OLD, @DAILY_LATE_FEE_NEW, @DAILY_LATE_FEE_OLD

    END
    CLOSE CURSORFORUPDATE
    DEALLOCATE CURSORFORUPDATE

    END
END
END

我正在运行的更新

UPDATE DETAILRENTAL
SET DETAIL_RETURNDATE = 2013-03-10
WHERE RENT_NUM = 1001

这使得电影在DETAILRENTAL表中返回，这应该更新MEMBERSHIP表中的成员余额。任何有关如何解决此错误的想法都将不胜感激。

Answer 1

DETAIL_RETURNDATE字段可能有datetime或date类型，但您尝试将其设置为数字：2013-03-10 = 2013减3减10 = 2000 。

试试这个：

Update DETAILRENTAL
   Set DETAIL_RETURNDATE = Convert(datetime, '2013-03-10', 23)
   Where RENT_NUM = 1000;

在这种情况下，Convert(datetime, , 23)可能不是绝对必要的，但如果您的输入日期格式一致，这是很好的做法。

修改

前者可能是您问题的根源，但我也注意到这更可能是造成错误的原因

ALTER TRIGGER [dbo].[TRG_MEM_BALANCE_AWW] ON [dbo].[DETAILRENTAL] AFTER INSERT, DELETE, UPDATE AS BEGIN IF (EXISTS (SELECT * FROM inserted) AND EXISTS (SELECT * FROM deleted)) BEGIN DECLARE CURSORFORUPDATE CURSOR FOR SELECT I.RENT_NUM, I.DETAIL_DUEDATE, I.DETAIL_RETURNDATE,I.DETAIL_DAILYLATEFEE, D.DETAIL_DUEDATE, D.DETAIL_RETURNDATE, D.DETAIL_DAILYLATEFEE FROM inserted I INNER JOIN DELETED D ON I.Rent_Num = D.Rent_Num AND I.Vid_Num = D.Vid_Num DECLARE @RENT_NUM INT DECLARE @RETURN_DATE_NEW DATETIME DECLARE @DUE_DATE_OLD DATETIME DECLARE @DUE_DATE_NEW DATETIME DECLARE @RETURN_DATE_OLD DATETIME DECLARE @DAILY_LATE_FEE_NEW DECIMAL(5,2) DECLARE @DAILY_LATE_FEE_OLD DECIMAL(5,2) DECLARE @LATE_FEE_PRIOR DECIMAL(5,2) DECLARE @LATE_FEE_AFTER DECIMAL(5,2) DECLARE @CHANGE DECIMAL (5,2) OPEN CURSORFORUPDATE FETCH NEXT FROM CURSORFORUPDATE INTO @RENT_NUM, @DUE_DATE_NEW, @RETURN_DATE_NEW, @DAILY_LATE_FEE_NEW, @DUE_DATE_OLD, @RETURN_DATE_OLD, @DAILY_LATE_FEE_OLD WHILE (@@FETCH_STATUS = 0) BEGIN --A IF(@RETURN_DATE_OLD > @DUE_DATE_OLD) SELECT @LATE_FEE_PRIOR = DATEDIFF(DAY, @DUE_DATE_OLD, @RETURN_DATE_OLD) * @DAILY_LATE_FEE_OLD; ELSE SELECT @LATE_FEE_PRIOR = 0; --B IF(@RETURN_DATE_NEW > @DUE_DATE_NEW) SELECT @LATE_FEE_AFTER = DATEDIFF(DAY, @DUE_DATE_NEW, @RETURN_DATE_NEW) * @DAILY_LATE_FEE_NEW ELSE SELECT @LATE_FEE_AFTER = 0 --C SELECT @CHANGE = @LATE_FEE_AFTER - @LATE_FEE_PRIOR --D IF(@CHANGE <> 0) BEGIN DECLARE @MEM_NUM INT; SELECT @MEM_NUM = M.Mem_Num FROM RENTAL R INNER JOIN MEMBERSHIP M ON R.MEM_NUM = M.MEM_NUM AND R.RENT_NUM = @RENT_NUM UPDATE MEMBERSHIP SET Mem_Balance = MEM_BALANCE + @CHANGE WHERE Mem_Num = @MEM_NUM END -- End of IF(@CHANGE <> 0) FETCH NEXT FROM CURSORFORUPDATE INTO @RENT_NUM, @DUE_DATE_NEW, @RETURN_DATE_NEW, @DAILY_LATE_FEE_NEW, @DUE_DATE_OLD, @RETURN_DATE_OLD, @DAILY_LATE_FEE_OLD END -- End of WHILE (@@FETCH_STATUS = 0) CLOSE CURSORFORUPDATE DEALLOCATE CURSORFORUPDATE END -- End of IF(EXISTS (Select * From Inserted) AND EXISTS (Select * From Deleted)) END -- end of trigger

似乎第二次从光标中取出时，列出的变量与第一次的顺序不同。因此，您尝试从DETAIL_DAILYLATEFEE插入@RETURN_DATE_NEW和DETAIL_RETURNDATE插入@DAILY_LATE_FEE_NEW。

我认为匹配BEGIN ... END可能也存在一些问题。

修改

这是我的测试脚本，似乎一切都在这里正常工作。

Create Table Rental ( Rent_Num int, Mem_Num int); Create Table DetailRental ( Rent_Num int, Vid_Num int, Detail_DueDate datetime, Detail_ReturnDate datetime, Detail_DailyLateFee decimal(5,2)); Create Table Membership ( Mem_Num int, Mem_Balance money); Insert Into Membership Values (1, 0); Insert Into Rental Values (1, 1); Insert Into DetailRental Values (1, 1, '2016-11-21', '2016-11-23', 1), (1, 2, '2015-11-21', '2016-11-22', 0.5); Go

然后按照上一个列表
在表格上创建触发器
Select * From DetailRental; Select * From Rental; Select * From Membership; Update DetailRental Set Detail_ReturnDate = '2016-11-21' Where Rent_Num = 1; Select * From Membership; Go

在

Mem_Num Mem_Balance 1 0.00

在

Mem_Num Mem_Balance 1 2.00

光标中的转换错误？

1 个答案: