如何使用函数在存储过程中初始化变量

问题描述

| 如何使用函数初始化存储过程中的变量？ 这不起作用：

/****** Object:  StoredProcedure [dbo].[usp_ShowBackpopGaps]    Script Date: 05/25/2011 19:57:23 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO


-- =============================================
-- Author:      <Author,Name>
-- Create date: <Create Date,>
-- Description: <Description,>
-- =============================================
ALTER PROCEDURE [dbo].[usp_ShowBackpopGaps] 
    -- Add the parameters for the stored procedure here
    @StartDate datetime = DateAdd(yy,-1,getdate()),@EndDate datetime = getdate
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    ;with dateranges as(
                select DateAdd(dd,EtlStartDate) as DateFrom,DateAdd(dd,1,EtlEndDate) as Dateto
                from EtlJobRunStatus
                where JobRunStepID like \'ETL[0-9]%\' and EndTime is not null
                union all
                select @StartDate,@StartDate 
                union all
                select DateAdd(dd,@EndDate),@EndDate)    
            )
            select DateAdd(dd,Dateto) as MissingFrom,NextDateFrom) as MissingTo,DateDiff(d,Dateto,NextDateFrom) as MissingDays
            from (
              select distinct DateFrom,Dateto as Dateto,(select MIN (dateFrom) 
                    from dateranges 
                    where Dateto > D.Dateto
                 ) as NextDateFrom
              from dateranges D
            ) X
            where Dateto < NextDateFrom
END


GO

    

解决方法

您不能将函数调用作为参数默认值。 我觉得你需要

CREATE PROCEDURE [dbo].[usp_ShowBackpopGaps] 
 @StartDate DATETIME = NULL,@EndDate DATETIME = NULL
AS 
BEGIN
SET @StartDate = ISNULL(@StartDate,DATEADD(yy,-1,GETDATE()))
SET @EndDate =  ISNULL(@EndDate,GETDATE())
...