学步园

if exists (select * from dbo.sysobjects where id = object_id(N'[tb_Holiday]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [tb_Holiday]
GO

--定义节假日表
CREATE TABLE tb_Holiday(
HDate smalldatetime primary key clustered, --节假日期
Name nvarchar(50) not null) --假日名称
GO

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

--计算两个日期之间的工作天数
CREATE FUNCTION f_WorkDay
( @dt_begin datetime, --计算的开始日期
@dt_end datetime --计算的结束日期 )
RETURNS int
AS
BEGIN
IF @dt_begin>@dt_end
RETURN(DATEDIFF(Day,@dt_begin,@dt_end) +1-( SELECT COUNT(*) FROM tb_Holiday WHERE HDate BETWEEN @dt_begin AND @dt_end))
RETURN(-(DATEDIFF(Day,@dt_end,@dt_begin) +1-( SELECT COUNT(*) FROM tb_Holiday WHERE HDate BETWEEN @dt_end AND @dt_begin)))
END
GO

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

--在指定日期上增加工作天数
CREATE FUNCTION f_WorkDayADD(
@date datetime, --基础日期
@workday int --要增加的工作日数 )
RETURNS datetime
AS

BEGIN
IF @workday>0
WHILE @workday>0
SELECT @date=@date+@workday,@workday=count(*) FROM tb_Holiday WHERE HDate BETWEEN @date AND @date+@workday
ELSE WHILE @workday<0
SELECT @date=@date+@workday,@workday=-count(*) FROM tb_Holiday WHERE HDate BETWEEN @date AND @date+@workday
RETURN(@date)
END