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Re: stored procedures and type of returned result.

From: "Philippe Lang" <philippe(dot)lang(at)attiksystem(dot)ch>
To: <pgsql-sql(at)postgresql(dot)org>
Subject: Re: stored procedures and type of returned result.
Date: 2004-08-24 09:56:29
Message-ID: 6C0CF58A187DA5479245E0830AF84F420803D5@poweredge.attiksystem.ch (view raw or flat)
Thread:
Lists: pgsql-sql
Patrice,

You might have a look at "views" as well. That's not strictily speaking a stored procedure, but maybe it's what you are searching for?

Philippe Lang

-----Message d'origine-----
De : pgsql-sql-owner(at)postgresql(dot)org [mailto:pgsql-sql-owner(at)postgresql(dot)org] De la part de Richard Huxton
Envoyé : mardi, 24. août 2004 11:26
À : Patrice OLIVER
Cc : pgsql-sql(at)postgresql(dot)org
Objet : Re: [SQL] stored procedures and type of returned result.

Patrice OLIVER wrote:
> Hello,
> 
> I'm new in PostgreSQL. It's very cool.

Hello, and yes it is isn't it :-)

> I would like to know how to return a set of records from a stored 
> procedure.
> 
> For example, i would like to execute these sql command from a stored 
> procedure :
> 
> select t.typnum, t.typcom, t.typcateg, s.symurlgraph from structure.type t
>   left join structure.symbole s
>   on t.typcode = s.typcode;

Broadly speaking you'll want something like:

CREATE TYPE my_return_type AS (
   a  integer,
   b  text
);

CREATE FUNCTION my_function(integer) RETURNS SETOF my_return_type AS '
   SELECT foo_a, foo_b FROM foo WHERE foo_c = $1; ' LANGUAGE SQL;

You don't need to define your own type if you want to return the same columns as a table, you can use the table-name instead.

For more complex cases where you need procedural code, you probably want to read Stephan Szabo's set-returning-functions article on techdocs.
   http://techdocs.postgresql.org/guides/SetReturningFunctions

HTH
-- 
   Richard Huxton
   Archonet Ltd

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