Skip site navigation (1) Skip section navigation (2)

Re: [pgadmin-support] Schemas causing problems :(

From: "Dave Page" <dpage(at)vale-housing(dot)co(dot)uk>
To: "Andreas Pflug" <pgadmin(at)pse-consulting(dot)de>
Cc: "Vitaly Belman" <vitalyb(at)gmail(dot)com>,<pgadmin-hackers(at)postgresql(dot)org>
Subject: Re: [pgadmin-support] Schemas causing problems :(
Date: 2004-07-26 14:52:30
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgadmin-hackers

> -----Original Message-----
> From: Andreas Pflug [mailto:pgadmin(at)pse-consulting(dot)de] 
> Sent: 26 July 2004 17:28
> To: Dave Page
> Cc: Vitaly Belman; pgadmin-hackers(at)postgresql(dot)org
> Subject: Re: [pgadmin-support] Schemas causing problems :(
> This is really hackers stuff.
> Dave Page wrote:
> > 
> > 
> > I don't recall that discussion, but in general I think we should 
> > completely ignore the search path. Consider a function: 
> foo.dostuff().
> > The current code will return an empty schema prefix for a 
> search_path 
> > of public,bar,foo. What if there is also public.dostuff() 
> or bar.dostuff()?
> > CREATE OR REPLACE could really screw up in that case...
> Some logic black holes... preliminarily public only.

Public only would work fine unless the user had an object in pg_catalog
(not advisable, but when did that stop some ppl)...
> > 
> > I also don't like the notion of treating public as some kind of 
> > special schema. From PostgreSQL's pov, its only special in 
> that it's 
> > there by default in template1 and the search_path. Other than that 
> > it's just another schema and should be treated as such.
> A grep showed that only FK has handles public special, all 
> other places go through pgDatabase::GetSchemaPrefix.

Yeah - I thought you were implying treating public/pg_catalog
differently when you said "It's obviously a mistake to suppress the
schema when creating/modifying objects (unless public or pg_catalog)"

> The correct overall behaviour seems
> - find the first schema in search_path that exists.
> - If this is the schema in question, suppress it.

OK. Still might result in broken reverse engineered SQL when used in a
different session with a different search path of course.

> - (ignore all following schema names, this was the main problem)


> - If schema = pg_catalog, suppress it.

Why? Any reverse engineered SQL will then incorrectly force objects into
the first existing schema in the search_path, not pg_catalog.

> Unfortunately, this search_path[i] = session_user is not 
> absolutely stable (schema or user name may change), but it 
> should be stable enough.
> Thoughts?

Fully qualify everything. I think it's the only truly infallible way.

Regards, Dave


pgadmin-hackers by date

Next:From: Dave PageDate: 2004-07-26 15:25:35
Subject: Re: [pgadmin-support] Schemas causing problems :(
Previous:From: cvsDate: 2004-07-26 13:35:36
Subject: CVS Commit by andreas: fix search_path/schema prefix bug

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group