On Mon, 13 Oct 2008 12:17:21 +0300
Vladimir Dzhuvinov <vd@valan.net> wrote:
> CREATE PROCEDURE list_user_accounts(IN user_id INT)
>
> BEGIN
>
> -- Return first result set (single row)
> SELECT * FROM users WHERE id = user_id;
>
> -- Return second result set (zero or more rows)
> SELECT * FROM accounts WHERE account_holder = user_id;
>
> END;
I'd say returning multiple recordset is useful to save connections
and transferred data.
You can't get the same with a left join (users fields will be
repeated over and over) and you can't get the same with 2 separated
statements since they will need 2 connections.
But from the client side, suppose it PHP... if the first
statement return no record and the second one return 3 records, how
can I know?
What about functions like pg_num_fields?
--
Ivan Sergio Borgonovo
http://www.webthatworks.it
