如何使用函數初始化存儲過程中的變量

Question

如何使用函數初始化存儲過程中的變量？

這不起作用：

/****** 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,-1,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,-1,@EndDate),DateAdd(dd,-1,@EndDate)  
      ) 
      select DateAdd(dd,-1,DateTo) as MissingFrom, 
       DateAdd(dd,1,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 

Answer 1

你不能有一個函數調用作爲參數的默認值。

我想你需要

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()) 
...