Re: [HACKERS] PQdeleteTuple function in libpq

Hello, Andrew.

You wrote:

AC> 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.
>>

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

Well, yes. I can. But don't you think it's too complex? Plus such
approach uses twice as much memory.

--
With best wishes,
Pavel mailto:pavel(at)gf(dot)microolap(dot)com