sql:字符串按照某个字符分割后取第几个字符串

SET QUOTED_IDENTIFIER ON 

GO

SET ANSI_NULLS ON 

GO

ALTER                  function uf_getStrBySplit(@old_str varchar(8000),@split varchar(50),@pos int) returns varchar(200)

as

/*

功能描述：返回分割后的字符串的第几个字符串

参数说明:@old_str:原字符串

@split:分隔符

@pos:第几个

*/

begin

declare @rtn varchar(200),

@li_p int

select @rtn=''

select @old_str=ltrim(rtrim(@old_str))+@split

select @li_p=0

while charindex(@split,@old_str)>1

begin

select @li_p=@li_p + 1

if @li_p=@pos

begin

select @rtn=left(@old_str,charindex(@split,@old_str) - 1)

return @rtn

end

select @old_str=right(@old_str,len(@old_str) - charindex(@split,@old_str))

end

return @rtn

end

GO

SET QUOTED_IDENTIFIER OFF 

GO

SET ANSI_NULLS ON 

GO