SQL Server 查询语句提取中文内容

create function fun_getCN(@str nvarchar(4000))
returns nvarchar(4000)
as
begin
declare @word nchar(1),@CN nvarchar(4000)
set @CN=''
while len(@str)>0
begin
set @word=left(@str,1)
if unicode(@word) between 19968 and 19968+20901
set @CN=@CN+@word
set @str=right(@str,len(@str)-1)
end
return @CN
end

select dbo.fun_getCN('sdsfdfd博客园xcxcxc')
博客园
select dbo.fun_getCN('cxxvx发布cxcx')
发布
select dbo.fun_getCN('cxcXZCzxc')
空字符串

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