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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Heller <info@zilence.net>
Cc: pgsql-interfaces@postgresql.org
Subject: Re: Protocol Question
Date: Mon, 11 Aug 2014 11:06:19 -0400
Message-ID: <22826.1407769579@sss.pgh.pa.us> (raw)
In-Reply-To: <CAGTxmOvGwPoBC01-XnS-1cTNE29T2+QRuheQBPSrKNpbgVpmXQ@mail.gmail.com>
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Thomas Heller <info@zilence.net> writes:
> The first 16 bits (well skip the first 40) in every DataRow ('D') packet
> refer to the number of columns following. Is there any way that this number
> is different from the number received in the RowDescription ('T')?
A quick look into libpq says that it doesn't support them being different:
/* Get the field count and make sure it's what we expect */
if (pqGetInt(&tupnfields, 2, conn))
{
/* We should not run out of data here, so complain */
errmsg = libpq_gettext("insufficient data in \"D\" message");
goto advance_and_error;
}
if (tupnfields != nfields)
{
errmsg = libpq_gettext("unexpected field count in \"D\" message");
goto advance_and_error;
}
> Currently I use an assert since I assume it always is the same, however I
> only have tested with a very limited dataset so far.
An assert seems overly optimistic. libpq has an explicit test with an
error recovery path, you should too.
regards, tom lane
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To: pgsql-interfaces@postgresql.org
Cc: tgl@sss.pgh.pa.us, info@zilence.net
Subject: Re: Protocol Question
In-Reply-To: <22826.1407769579@sss.pgh.pa.us>
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