cycling through custom type fields

[Julius Tuskenis <julius@xxxxxxxx>]

Hello,

I would like to ask if there is a possibility in postgresql (v9) to 
cycle through the fields of some custom type parameter in plpgsql function.

I have a type defined:
CREATE TYPE naims.frt_pwd_ed AS
   (pwd_id integer,
    pwd_sub_id integer,
    pwd_login character varying(100));

In pseudocode thats what I'd like to achieve:

function Changes(prm_old_pwd  naims.frt_pwd_ed, prm_new_pwd 
naims.frt_pwd_ed)
returns set of text
begin
  FOR i = 0 to naims.frt_pwd_ed.FieldCount -1 LOOP
    IF prm_old_pwd.field(i).value <> prm_new_pwd.field(i).value THEN
      Return Next prm_old_pwd.field(i).fieldname;
    END IF;
  END LOOP;
  Return;
end;

The functrion should check each field of 2 provided parameters and 
return the fieldnames where the values are different. For this I need 
some tools to extract field value and field name. Can this be done?

Thank You in advance!

--
Julius Tuskenis
Programavimo skyriaus vadovas
UAB nSoft
mob. +37068233050


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