Re: Stored procedures and "pseudo" fields.. - Mailing list pgsql-sql

On 2004-07-20 15:34, Użytkownik Lars Erik Thorsplass napisał:
> My stored procedure "acl_check()" takes two integers as parameters.
> Param1 is the object id to check acl on, Param 2 is the object id of
> the user currently using the system. The procedure returns a positive
> number (1 or 3 ) if you have some kind of access to the object. As one
> might understand I want the returned value from the acl_check()
> procedure to be a part of the result set.
> 
> Kinda like this:
> 
> SELECT *, acl_check( objects.obid, <user_id> ) AS mode FROM objects
> WHERE mode > 0;
> 
> This gives me a: ERROR:  column "mode" does not exist

You can't access column output alias in where clause. Instead you have 
to use your function twice:

SELECT *, acl_check( objects.obid, <user_id> ) AS mode FROM objects
WHERE acl_check( objects.obid, <user_id> ) > 0;

Regards,
Tomasz Myrta