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Message-ID: <4DE79A58.4010608@esilo.com>
Date: Thu, 02 Jun 2011 10:12:40 -0400
From: Andrew Chernow <ac@esilo.com>
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To: Pavel Golub <pavel@gf.microolap.com>
CC: Pavel Golub <pavel@microolap.com>,
	PostgreSQL Hackers <pgsql-hackers@postgresql.org>,
	pgsql-interfaces@postgresql.org
Subject: Re: PQdeleteTuple function in libpq
References: <147534417.20110601184310@gf.microolap.com>
	<4DE6A5B7.2070700@esilo.com>
	<707574086.20110602112826@gf.microolap.com>
In-Reply-To: <707574086.20110602112826@gf.microolap.com>
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On 6/2/2011 4:28 AM, Pavel Golub wrote:
> Hello, Andrew.
>
> You wrote:
>
> AC>  On 6/1/2011 11:43 AM, Pavel Golub wrote:
>>> Hello.
>>>
>>> I'm some kind of PQdeleteTuple function will be very usefull in libpq.
>>> Because right now after deleting some record I need refetch result
>>> set, or mark tuple as deleted and this is headache for me.
>>>
>
> AC>  IMHO, this should be handled by the application.  You could track tuples
> AC>  removed in an int[] or copy the result set into an application defined
> AC>  array of C structures.  I've always been under the impression that
> AC>  PGresult objects are immutable once delivered to the application.
>
>
> Andrew, why we have PQmakeEmptyPGresult, PQcopyResult,
> PQsetResultAttrs, PQsetvalue and PQresultAlloc in this case? Of course
> there's no big deal with their absence but let's be consistent.
>

I'm not entirely sure what you are trying to do, but can't you use 
PQmakeEmptyPGresult, PQsetResultAttrs and PQsetvalue to construct a 
result that excludes the tuples you don't want followed by a 
PQclear(initial_result)?

-- 
Andrew Chernow
eSilo, LLC
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