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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.



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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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Patrice,

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

Philippe Lang

-----Message d'origine-----
De : pgsql-sql-owner [at] postgresql.org [mailto:pgsql-sql-owner [at] postgresql.org]=
De la part de Richard Huxton
Envoy=E9 : mardi, 24. ao=FBt 2004 11:26
=C0 : Patrice OLIVER
Cc : pgsql-sql [at] 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 =3D 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 =3D $1; ' LANGUAGE SQL;

You don't need to define your own type if you want to return the same colum=
ns 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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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

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