Sql 分割 键值对字符串 得到某值对应的名称

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER function [dbo].[GetStrOfIndex]
(
@content varchar(1024), --要分割的字符串
@index varchar(500) --要获取的元素的值
)
returns varchar(1024)
as
begin
declare @str varchar(500)
if(charindex(@index,@content)<>0)
begin
declare @strname varchar(500)
set @strname=substring(@content,charindex(@index,@content),len(@content)-charindex(@index,@content)+1)
if(charindex(',',@strname)<>0)
set @str= substring(@strname,charindex(':',@strname)+1,charindex(',',@strname)-charindex(':',@strname)-1)
else
set @str= substring(@strname,charindex(':',@strname)+1,len(@strname)-charindex(':',@strname))
end
else
set @str= @index
return @str
end