Question

我挣扎着我的存储过程，它增加了“空”＆＃39;而不是数字

那么为什么以下程序会添加＆＃39; NULL＆＃39;而不是介于0和无穷大之间的值？

这是我的程序

ALTER PROCEDURE [dbo].[Plan_Abschluss]

    -- My parameters for the stored procedure
    @date                   AS datetime2(7),
    @Einrichtung            AS Int,
    @Mitarbeiter            AS Int

AS
BEGIN

    -- declare my parameters
    DECLARE @PlanStunden            AS decimal(18, 2)= null,
            @PlanUrlaub             AS Int= null,

            @oldDate                AS datetime2(7)= null,
            @oldUrlaubskonto        AS Int= null,
            @oldStundenKonto        AS decimal(18, 2)= null;

    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- set the previous month
    SET @oldDate= DATEADD(month, -1, @date);

    -- get some values from the previous row and set it to my parameters
    SELECT  @oldUrlaubskonto =  ISNULL(CurrentUrlaubskonto,0) ,
            @oldStundenKonto =  ISNULL(CurrentStundenKonto,0)

    FROM    [Plan]

    WHERE   [Jahr]              = YEAR(@oldDate)
    AND     [Monat]             = MONTH(@oldDate)
    AND     [RefMitarbeiterId]  = @Mitarbeiter
    AND     [RefEinrichtungId]  = @Einrichtung;

    -- get some values from the row i want to update and set it to my parameters
    SELECT  @PlanStunden =  ISNULL(PlanStunden,0) ,
            @PlanUrlaub =   ISNULL(PlanUrlaub,0)

    FROM    [Plan]

    WHERE   [Jahr]              = YEAR(@date)
    AND     [Monat]             = MONTH(@date)
    AND     [RefMitarbeiterId]  = @Mitarbeiter
    AND     [RefEinrichtungId]  = @Einrichtung;

    -- update the row and do a calculation with my parameters
    UPDATE  [Plan]

    SET     Abgeschlossen       = 1,
            CurrentUrlaubskonto = @oldUrlaubskonto+ @PlanUrlaub,
            CurrentStundenKonto = @oldStundenKonto+ @PlanStunden 

    WHERE   [Jahr]              = YEAR(@date)
    AND     [Monat]             = MONTH(@date)
    AND     [RefMitarbeiterId]  = @Mitarbeiter
    AND     [RefEinrichtungId]  = @Einrichtung

END

Answer 1

如果没有返回行，则不会在select中设置变量。我的猜测是使用select的第一个@OldDate根本不匹配任何行。

特别是，变量@oldUrlaubskonto和@oldStundenKonto初始化为NULL，因此在没有匹配记录时永远不会设置它们。解决这个问题的一个简单方法是使用聚合 - 无论如何你都期待一行，所以没关系：

SELECT  @oldUrlaubskonto =  ISNULL(max(CurrentUrlaubskonto), 0) ,
        @oldStundenKonto =  ISNULL(max(CurrentStundenKonto), 0

如果值仍为NULL，您也可以在之后设置值。

如何使用一些声明和设置的值更新行

1 个答案: