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【DM版本】:7
【操作系统】：
【CPU】:
【问题描述】*：sql server上创建的标量函数 怎么完美在达梦上创建一模一样的

附原sql语句
USE [模式名]
GO
/****** Object: UserDefinedFunction [dbo].[SplitDay] Script Date: 02/28/2022 15:15:15 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER FUNCTION [dbo].[SplitDay]
(
@StartDate DateTime,
@EndDate DateTime,
@iDay numeric(16,1),
@iRealDay numeric(16,1),
@bALL INT,
@SFDate DateTime,
@STDate DateTime
)
RETURNS numeric(16,1)
AS
BEGIN

declare @iNum numeric(16,1)
declare @iSysID BigInt
declare @nowDay DateTime 
declare @cWeekName nvarchar(20)
set @iNum=0
set @StartDate= CONVERT(varchar(10),@StartDate,120)
if @iRealDay=0 
	begin 
		set @iRealDay =@iDay 
	end 
set @SFDate=CONVERT(varchar(10),@SFDate,120)
set @STDate=CONVERT(varchar(10),@STDate,120)
if @EndDate='' or @EndDate IS NULL 
begin
	set @EndDate=@STDate
end
set @iSysID=ISNULL((Select ID From Sysobjects where xtype='U' and name='SetHoliDay'),0)
if @iSysID =0
	begin
		set @nowDay=@StartDate
		if @nowDay <@SFDate
		begin
			set @nowDay =@SFDate 
		end
		if @EndDate>@STDate 
		begin
			set @EndDate =@STDate 
		end
		while CONVERT(nvarchar(10),@nowDay,120)<=Convert(varchar(10),@EndDate,120)
		begin
			if CONVERT(nvarchar(10),@nowDay,120) >=CONVERT(nvarchar(10),@SFDate,120) and CONVERT(nvarchar(10),@nowDay,120) <=CONVERT(nvarchar(10),@STDate,120)
			begin
				if @bALL =0 
					begin
						
						set @cWeekName =(Select DATENAME(weekday,''+CONVERT(nvarchar(10),@nowDay,120)+''))
						if @cWeekName ='星期六' or @cWeekName ='星期日'
							begin
								set @iNum=@iNum 
							end
						else
							begin 
								set @iNum=@iNum + 1
							end
					end
				else
					begin
						set @iNum=@iNum + 1
					end
			end
		if @iNum >@iRealDay 
			begin
				set @iNum =@iRealDay 
				return @iNum
			end
		set @nowDay=@nowDay +1
		end
	end
else
	begin
		set @nowDay=@StartDate
		if @nowDay <@SFDate
		begin
			set @nowDay =@SFDate 
		end
		if @EndDate>@STDate 
		begin
			set @EndDate =@STDate 
		end
		while CONVERT(nvarchar(10),@nowDay,120)<=Convert(varchar(10),@EndDate,120)
		begin
			if CONVERT(nvarchar(10),@nowDay,120) >=CONVERT(nvarchar(10),@SFDate,120) and CONVERT(nvarchar(10),@nowDay,120) <=CONVERT(nvarchar(10),@STDate,120)
			begin
				if @bALL =0 
					begin
						set @cWeekName=ISNULL((Select Top 1 ISNULL(DDATE,'') as cStrDate From FE_BASE5..SetHoliDay where dDate=''+CONVERT(nvarchar(10),@nowDay,120)+''),'')
						if @cWeekName<>'' 
							begin
								set @iNum=@iNum 
							end
						else
							begin
								set @iNum=@iNum +1
							end
					end
				else
					begin
						set @iNum=@iNum + 1
					end
			end
		if @iNum >@iRealDay 
			begin
				set @iNum =@iRealDay 
				return @iNum
			end
		set @nowDay=@nowDay +1
		end
	end
begin 
	if @iNum >@iRealDay 
		begin
			set @iNum =@iRealDay 
		end
end
return @iNum

END