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Re: Not clear on what PQgetResult does

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Cc: David Rysdam <drysdam(at)ll(dot)mit(dot)edu>, pgsql-interfaces(at)postgresql(dot)org
Subject: Re: Not clear on what PQgetResult does
Date: 2005-11-22 22:33:18
Message-ID: 200511222233.jAMMXI925739@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-interfaces
Alvaro Herrera wrote:
> David Rysdam wrote:
> > Joshua D. Drake wrote:
> > 
> > >>>It isn't.  You can use it in an asynchronous client, but the way you do
> > >>>that is by not calling it until PQisBusy says you can (which means the
> > >>>whole result has arrived, and you're just calling PQgetResult to get
> > >>>hold of it).
> > >>>
> > >>So there's no way to have libpq return partial results before they 
> > >>are all ready?
> > >>
> > >>If I may, I would like to express some degree of incredulity.  Even 
> > >>the version of Sybase I'm using does this right and it's from 1997!
> > >
> > >I am sure we would welcome a patch ;))
> > 
> > To be honest, this is almost enough to drive me away from PG.
> 
> If you are in need of partial results you may as well use a cursor and
> fetch from it, a bunch at a time.

Right, this is the standard way.

> > Or are there underlying server reasons why this won't work?
> 
> This topic was discussed four days ago I think ... look for a thread
> with subject "Incremental results from libpq" on the archives of this
> list.

That thread has already been condensed into a TODO entry.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
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