From: Richard Huxton <dev@archonet.com>
To: Andrew Hall <andrewah@hotmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Table Valued Parameters
Date: Sat, 24 Oct 2009 13:01:07 +0100
Message-ID: <4AE2EC83.6060908@archonet.com> (raw)
In-Reply-To: <COL122-W14509AEC755F5710A3CA19CDBD0@phx.gbl>
References: <COL122-W14509AEC755F5710A3CA19CDBD0@phx.gbl>
Andrew Hall wrote:
> Hi,
>
> I was wondering whether anybody would be able to advise me on how (if it is possible) to port some functionality from Oracle?
>
> This is just an example - in Oracle, I am able to do the following
>
> --
> -- Create a data type which replicates the data structure of a single user in my application.
> -- I know that this can be done using PostgreSQL.
> -- Create a data type which can store many instances of a single 'TY_APP_USER'
> -- [essentially this is a table valued data type]. An instance of this data type can be
> -- created and populated by the client application [a java based one in my case].
> --
> -- I can't find any reference to something
> -- similar to this using postgreSQL.
The following may not do anything interesting, but it does show arrays
of composite types, which is what you are after.
To prevent quoting insanity, I recommend the ARRAY[] constructor rather
than array literals. You do need the explicit typecasts.
Oh - and version 8.3 or higher for arrays of compound types.
BEGIN;
CREATE TYPE typ1 AS (i integer, t text);
CREATE FUNCTION print_array(a typ1[]) RETURNS void AS $$
DECLARE
m int;
n int;
i int;
e typ1;
BEGIN
m := array_lower(a, 1);
n := array_upper(a, 1);
FOR i IN m .. n LOOP
e := a[i];
RAISE NOTICE '% - %', e.i, e.t;
END LOOP;
RETURN;
END;
$$ LANGUAGE plpgsql;
SELECT print_array(ARRAY[ '(1,"abc")'::typ1, '(2,"def")'::typ1 ]);
SELECT print_array(ARRAY[ '(1,"abc")', '(2,"def")' ]::typ1[]);
ROLLBACK;
--
Richard Huxton
Archonet Ltd
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: dev@archonet.com, andrewah@hotmail.com
Subject: Re: Table Valued Parameters
In-Reply-To: <4AE2EC83.6060908@archonet.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox