求一个月中的全部天数
2007-12-06 11:52
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一.建一个可获取当前日期的视图
CREATE VIEW mydate
AS
SELECT mydate = getdate()
二,建立函数,参数为一个1-12的数字表示月份.
create FUNCTION uf_getdays(@newdate varchar(2))
RETURNS int AS
BEGIN
declare @year as int
declare @month as int
declare @nextmonth as int
declare @days as int
declare @date as datetime
select @date= mydate from mydate
if @newdate <> ''
set @date=cast(cast(year(@date) as varchar(4))+'-'+@newdate+'-'+cast(day(@date) as varchar(2)) as datetime)
set @year=cast(year(@date) as int)
set @month=cast(month(@date) as int)
if @month=12
begin
set @year = @year +1
set @month =1
set @nextmonth =@month+1
end
else
begin
set @nextmonth =@month+1
end
set @days=datediff(day,cast(@year as varchar)+'-'+cast(@month as varchar)+'-01',cast(@year as varchar)+'-'+cast(@nextmonth as varchar)+'-01')
return @days
END
CREATE VIEW mydate
AS
SELECT mydate = getdate()
二,建立函数,参数为一个1-12的数字表示月份.
create FUNCTION uf_getdays(@newdate varchar(2))
RETURNS int AS
BEGIN
declare @year as int
declare @month as int
declare @nextmonth as int
declare @days as int
declare @date as datetime
select @date= mydate from mydate
if @newdate <> ''
set @date=cast(cast(year(@date) as varchar(4))+'-'+@newdate+'-'+cast(day(@date) as varchar(2)) as datetime)
set @year=cast(year(@date) as int)
set @month=cast(month(@date) as int)
if @month=12
begin
set @year = @year +1
set @month =1
set @nextmonth =@month+1
end
else
begin
set @nextmonth =@month+1
end
set @days=datediff(day,cast(@year as varchar)+'-'+cast(@month as varchar)+'-01',cast(@year as varchar)+'-'+cast(@nextmonth as varchar)+'-01')
return @days
END
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