/****************************************************************************************************************************
Name: ufn_SerialString
Description: 函數返回一個用分隔符連接起的字符串，其中每個單位的字符串不重復存在
Parameters: IN - @strBase - 連接在一起的字符串
IN - @strNew - 新加入的字符串
IN - @strSplitChar - 分隔符
Return: 連接在一起的字符串
Usage: create table #temp(strValue varchar(10))
insert #temp select 'a'
union all select 'b'
union all select 'c'
union all select 'b'
union all select 'a'
select strValue as N'原始數據' from #temp
declare @str varchar(1000)
select @str=dbo.ufn_SerialString(@str,strValue,',') from #temp
print '===================================================================================='
select @str as N'連接之後的字符串'
drop table #temp
Calling functions: System Module
****************************************************************************************************************************/
CREATE FUNCTION [dbo].[ufn_SerialString] (@strBase NVARCHAR(4000),
@strNew NVARCHAR(4000),
@strSplitChar NVARCHAR(1)='/')
RETURNS NVARCHAR(4000) AS
BEGIN
SET @strBase=RTRIM(ISNULL(@strBase,''))
SET @strNew=RTRIM(ISNULL(@strNew,''))
SET @strBase=CASE WHEN @strBase='' THEN @strNew
WHEN @strNew='' OR CHARINDEX(@strSplitChar+@strNew+@strSplitChar,@strSplitChar+@strBase+@strSplitChar)>0 THEN @strBase
ELSE @strBase+@strSplitChar+@strNew END
RETURN @strBase
END