Thread

Re: How to display a user-defined function? (2nd attempt)

selkovjr@mcs.anl.gov — 2000-09-12T08:19:16Z

Erich,

This message appears to have been lost, so I am re-sending it. In the
meanwhile, I found that I wasn't up to date on this. While my original
response remains valid, you might also want to check this one out:

http://x61.deja.com/[ST_rn=ps]/getdoc.xp?AN=634046478&CONTEXT=968745179.332202028&hitnum=1

--Gene

   ----- Original message follows ----- 

To: Erich <hh@cyberpass.net>
cc: pgsql-general@postgresql.org
From: selkovjr@mcs.anl.gov
Reply-to: selkovjr@mcs.anl.gov
Subject: Re: [GENERAL] How to display a user-defined function? 
In-reply-to: <200009061940.MAA21210@cyberpass.net> 
References: <200009061940.MAA21210@cyberpass.net>
Comments: In-reply-to Erich <hh@cyberpass.net>
   message dated "Wed, 06 Sep 2000 12:40:21 -0700."
Date: Wed, 06 Sep 2000 21:04:02 -0500
Sender: selkovjr@selkovjr.xnet.com

> I declared a function using CREATE FUNCTION.  Is there a way I can
> display the function back?  I tried \df, etc, but I couldn't figure
> out how to do it.

This feature does not come without some procurement on your part

At the same time when one registers a function, such as

CREATE FUNCTION func(arg, arg, ...) RETURNS ret
        AS 'file' LANGUAGE 'lang';

one also does

INSERT INTO pg_description (objoid, description)
   SELECT oid, 'the function func(arg, arg, ...) does so and so and
returns (ret)'::text
   FROM pg_proc
   WHERE proname = 'func'::name;

Of course, you are also responsible for updating the description
record every time you change or delete your function -- that is, every
time the oid of your function invalidates. It's also nice to let the
users (and yourself a while later) know about the arguments and the
return type of your function.

So when you delete it, you might want to do,

DELETE FROM pg_description 
   WHERE (objoid)
   IN (
     SELECT oid
     FROM pg_proc
     WHERE proname = 'func'::name
   );

DROP FUNCTION func(arg, arg, ...);

Wish it worked sine cura, but it doesn't. Maybe it even shouldn't.

--Gene

> 
> Thanks,
> 
> e
> 
> -- 
> This message was my two cents worth.  Please deposit two cents into
my
> e-gold account by following this link:
> http://rootworks.com/twocentsworth.cgi?102861
> 275A B627 1826 D627 ED35  B8DF 7DDE 4428 0F5C 4454

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