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下载地址：SqlFunction_udf_Week.rar

以下内容于20120105更新：

2012年刚到，开发的软件使用这个函数发现bug。2012年第一周应该是2012-01-01至2012-01-07，但此函数却把2012-01-08至2012-01-14当作第一周。

就此bug对此函数修改如下：

复制代码 代码如下:

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

ALTER FUNCTION [dbo].[udf_Week]

(

@StartYear INT,

@EndYear INT

)

RETURNS @Week TABLE([WeekId] INT IDENTITY(1,1) PRIMARY KEY,[Year] [INT] NULL,[Week] [INT] NULL,[StartDate] [DATETIME] NULL,[EndDate] [DATETIME] NULL)

AS

BEGIN

DECLARE @YearStartDate DATETIME

DECLARE @YearEndDate DATETIME

DECLARE @WeekStartDate DATETIME

DECLARE @WeekEndDate DATETIME

DECLARE @Weeks INT

WHILE @StartYear <= @EndYear

BEGIN

SET @YearStartDate = CAST((CAST(@StartYear AS VARCHAR(4)) + '-01-01') AS DATETIME)

SET @YearEndDate= CAST((CAST(@StartYear AS VARCHAR(4))+ '-12-31') AS DATETIME)

SET @Weeks = 1

IF DATEPART(DW,@YearStartDate) > 4

SET @YearStartDate = DATEADD(DAY,(8 - DATEPART(DW,@YearStartDate)) ,@YearStartDate)

ELSE

SET @YearStartDate = DATEADD(DAY,(-(DATEPART(DW,@YearStartDate)-1)),@YearStartDate)

SET @WeekStartDate = @YearStartDate

SET @WeekEndDate = DATEADD(DAY,6,@WeekStartDate)

WHILE DATEDIFF(DAY,@WeekStartDate,@YearEndDate) >= 4

BEGIN

INSERT INTO @Week([Year],[Week],[StartDate],[EndDate]) VALUES (@StartYear,@Weeks,@WeekStartDate,@WeekEndDate)

SET @Weeks = @Weeks + 1

SET @WeekStartDate = @WeekStartDate + 7

SET @WeekEndDate = @WeekEndDate + 7

END

SET @StartYear = @StartYear + 1

END

RETURN

END