Re: Dyamic updates of NEW with pl/pgsql

hubert depesz lubaczewski wrote:
> On Tue, Mar 09, 2010 at 06:59:31PM +0100, Pavel Stehule wrote:
>
>> 2010/3/9 strk <strk(at)keybit(dot)net>:
>>
>>> How can a pl/pgsql trigger change the
>>> values of dynamic fields in NEW record ?
>>>
>>> By "dynamic" I mean that the field name
>>> is a variable in the trigger context.
>>>
>>> I've been told it's easy to do with pl/perl but
>>> I'd like to delive a pl/pgsql solution to have
>>> less dependencies.
>>>
>> It isn't possible yet
>>
>
> well, it's possible. it's just not nice.
>
> http://www.depesz.com/index.php/2010/03/10/dynamic-updates-of-fields-in-new-in-plpgsql/
>

Using an hstore in 9.0 it's not too bad, Try something like:

CREATE OR REPLACE FUNCTION dyntrig()
RETURNS trigger
LANGUAGE plpgsql
AS $function$

declare
hst hstore;
begin
hst := hstore(NEW);
hst := hst || ('foo' => 'bar');
NEW := populate_record(NEW,hst);
return NEW;
end;

$function$;

But this question probably belongs on -general rather than -hackers.

cheers

andrew