On Tue, Aug 01, 2006 at 12:37:48PM -0500, Jim C. Nasby wrote: > On Sun, Jul 30, 2006 at 11:27:33AM -0400, Tom Lane wrote: > > David Fetter <[EMAIL PROTECTED]> writes: > > > On Sat, Jul 29, 2006 at 09:44:10PM -0400, Tom Lane wrote: > > >> The correct solution is for client-side libraries to provide > > >> the feature. > > > > > Not if the app is written in SQL, as the bootstrap, regression > > > test, etc. code for modules frequently is. > > > > SQL doesn't really have any conditional ability strong enough to > > deal with existence or non-existence of features. What are you > > hoping to do, a CASE expression? Both arms of the CASE still have > > to parse, so I remain unconvinced that there are real world uses.
CREATE OR REPLACE FUNCTION version_new_enough( in_version INTEGER ) RETURNS BOOLEAN LANGUAGE sql AS $$ SELECT COALESCE( s.setting::INTEGER, /* Cast setting to integer if it's there */ $1 - 1 /* Otherwise, guarantee a lower number than the input */ ) >= $1 FROM (SELECT 'server_version_num'::text AS name) AS foo LEFT JOIN pg_catalog.pg_settings s ON (foo.name = s.name) $$; > There's also plpgsql, which afaik has no way to get the version > number (other than slogging though the output of version()). Right. String-mashing is great when you have to do it, but this patch sets it up so you don't have to. :) Cheers, D -- David Fetter <[EMAIL PROTECTED]> http://fetter.org/ phone: +1 415 235 3778 AIM: dfetter666 Skype: davidfetter Remember to vote! ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly