8.生成日期列表的函数

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_getdate]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[f_getdate]
GO

/*--生成日期列表
	
	生成指定年份的工作日/休息日列表

*/

/*--调用示例

	--查询 2003 年的工作日列表
	SELECT * FROM dbo.f_getdate(2003,0)
	
	--查询 2003 年的休息日列表
	SELECT * FROM dbo.f_getdate(2003,1)

	--查询 2003 年全部日期列表
	SELECT * FROM dbo.f_getdate(2003,NULL)
--*/
CREATE FUNCTION dbo.f_getdate(
@year int,    --要查询的年份
@bz bit       --@bz=0 查询工作日,@bz=1 查询休息日,@bz IS NULL 查询全部日期
)RETURNS @re TABLE(id int identity(1,1),Date datetime,Weekday nvarchar(3))
AS
BEGIN
	DECLARE @tb TABLE(ID int IDENTITY(0,1),Date datetime)
	INSERT INTO @tb(Date) SELECT TOP 366 DATEADD(Year,@YEAR-1900,'1900-1-1')
	FROM sysobjects a ,sysobjects b
	UPDATE @tb SET Date=DATEADD(DAY,id,Date)
	DELETE FROM @tb WHERE Date>DATEADD(Year,@YEAR-1900,'1900-12-31')
	
	IF @bz=0
		INSERT INTO @re(Date,Weekday)
		SELECT Date,DATENAME(Weekday,Date)
		FROM @tb
		WHERE (DATEPART(Weekday,Date)+@@DATEFIRST-1)%7 BETWEEN 1 AND 5
	ELSE IF @bz=1
		INSERT INTO @re(Date,Weekday)
		SELECT Date,DATENAME(Weekday,Date)
		FROM @tb
		WHERE (DATEPART(Weekday,Date)+@@DATEFIRST-1)%7 IN (0,6)
	ELSE
		INSERT INTO @re(Date,Weekday)
		SELECT Date,DATENAME(Weekday,Date)
		FROM @tb
		
	RETURN
END
GO


/*====================================================================*/

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_getdate]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[f_getdate]
GO

/*--生成列表

	生成指定日期段的日期列表

--邹建 2005.03(引用请保留此信息)--*/

/*--调用示例

	--查询工作日
	SELECT * FROM dbo.f_getdate('2005-1-3','2005-4-5',0)
	
	--查询休息日
	SELECT * FROM dbo.f_getdate('2005-1-3','2005-4-5',1)
	
	--查询全部日期
	SELECT * FROM dbo.f_getdate('2005-1-3','2005-4-5',NULL)
--*/

CREATE FUNCTION dbo.f_getdate(
@begin_date Datetime,  --要查询的开始日期
@end_date Datetime,    --要查询的结束日期
@bz bit                --@bz=0 查询工作日,@bz=1 查询休息日,@bz IS NULL 查询全部日期
)RETURNS @re TABLE(id int identity(1,1),Date datetime,Weekday nvarchar(3))
AS
BEGIN
	DECLARE @tb TABLE(ID int IDENTITY(0,1),a bit)
	INSERT INTO @tb(a) SELECT TOP 366 0
	FROM sysobjects a ,sysobjects b
	
	IF @bz=0
		WHILE @begin_date<=@end_date
		BEGIN
			INSERT INTO @re(Date,Weekday)
			SELECT Date,DATENAME(Weekday,Date)
			FROM(
				SELECT Date=DATEADD(Day,ID,@begin_date)
				FROM @tb				
			)a WHERE Date<=@end_date
				AND (DATEPART(Weekday,Date)+@@DATEFIRST-1)%7 BETWEEN 1 AND 5
			SET @begin_date=DATEADD(Day,366,@begin_date)
		END
	ELSE IF @bz=1
		WHILE @begin_date<=@end_date
		BEGIN
			INSERT INTO @re(Date,Weekday)
			SELECT Date,DATENAME(Weekday,Date)
			FROM(
				SELECT Date=DATEADD(Day,ID,@begin_date)
				FROM @tb				
			)a WHERE Date<=@end_date
				AND (DATEPART(Weekday,Date)+@@DATEFIRST-1)%7 in(0,6)
			SET @begin_date=DATEADD(Day,366,@begin_date)
		END
	ELSE
		WHILE @begin_date<=@end_date
		BEGIN
			INSERT INTO @re(Date,Weekday)
			SELECT Date,DATENAME(Weekday,Date)
			FROM(
				SELECT Date=DATEADD(Day,ID,@begin_date)
				FROM @tb				
			)a WHERE Date<=@end_date
			SET @begin_date=DATEADD(Day,366,@begin_date)
		END

	RETURN
END
GO