Map Orphan users in database

BEGIN
 DECLARE @username varchar(25)
 DECLARE fixusers CURSOR
 FOR
 SELECT UserName = name FROM sysusers
  WHERE issqluser = 1 and (sid is not null and sid <> 0x0)
   and suser_sname(sid) is null
    ORDER BY name
 OPEN fixusers
 FETCH NEXT FROM fixusers
 INTO @username
 WHILE @@FETCH_STATUS = 0
 BEGIN
  EXEC sp_change_users_login 'update_one', @username, @username
  FETCH NEXT FROM fixusers
  INTO @username
 END
 CLOSE fixusers
 DEALLOCATE fix