Re: Append to a GUC parameter ?

On Wed, Aug  6, 2014 at 12:12:29AM -0300, Fabrízio de Royes Mello wrote:
> 
> On Tue, Aug 5, 2014 at 10:55 PM, Tom Lane  wrote:
> 
>     Josh Berkus  writes:
>     > BTW, while there's unlikely to be a good reason to put search_path in
>     > pg.conf with appends, there are a LOT of reasons to want to be able to
>     > append to it during a session.
> 
>     [shrug...]  You can do that today with current_setting()/set_config().
> 
> 
> 
> +1
> 
> With a very simple statement you can do that:
> 
> fabrizio=# SELECT current_setting('search_path');
>  current_setting
> -----------------
>  "$user",public
> (1 row)
> 
> fabrizio=# SELECT set_config('search_path', current_setting('search_path')||',
> another_schema', false);
>            set_config          
> --------------------------------
>  "$user",public, another_schema
> (1 row)

Yes, that is very nice, but it only works for session-level changes,
i.e. you can't use that in postgresql.conf or via ALTER USER/DATABASE.

--  Bruce Momjian          http://momjian.us EnterpriseDB                             http://enterprisedb.com
 + Everyone has their own god. +