Thread: stored procedures and type of returned result.

***********************
Aucun virus n'a été détecté dans la pièce-jointe no filename
---
No virus was detected in the attachment no filename

Votre courrier a été inspecté par InterScan Messaging Security Suite
---
Your mail has been scanned by InterScan MSS.
***********************


Hello,

I'm new in PostgreSQL. It's very cool.

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;
 

Is it possible ?
Do i have to return results in an array ?
If yes, how could i do ?

Do you think using plPHP mays help me ?

Regards,
Patrice OLIVER.

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

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
searchingfor? 

Philippe Lang

-----Message d'origine-----
De : pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] De la part de Richard Huxton
Envoyé : mardi, 24. août 2004 11:26
À : Patrice OLIVER
Cc : pgsql-sql@postgresql.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-functionsarticle on techdocs.  http://techdocs.postgresql.org/guides/SetReturningFunctions 

HTH
--   Richard Huxton  Archonet Ltd

---------------------------(end of broadcast)---------------------------
TIP 3: if posting/reading through Usenet, please send an appropriate     subscribe-nomail command to
majordomo@postgresql.orgso that your     message can get through to the mailing list cleanly 

Patrice OLIVER wrote:
> 
> Hello, I got this error message :
> 
> ERROR:  set-valued function called in context that cannot accept a set
> CONTEXT:  PL/pgSQL function "lsttable" line 5 at return next

You need to treat set-returning functions as though they are tables.  SELECT * FROM lsttable();
NOT  SELECT lsttable();

--   Richard Huxton  Archonet Ltd