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From: Igor Korot <ikorot01@gmail.com>
Date: Wed, 5 Mar 2025 17:10:30 -0600
Message-ID: <CA+FnnTw5xKm-E2X72qHANha-trXrJmumZt6KGa9tPsSAoZDj_A@mail.gmail.com>
Subject: Re: Error on query execution
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>
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Hi, Tom,

On Tue, Mar 4, 2025 at 8:37=E2=80=AFPM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Igor Korot <ikorot01@gmail.com> writes:
> >     binaryIntVal =3D htonl( (uint32_t) type );
> >     paramValues[0] =3D (char *) &binaryIntVal;
> >     paramLengths[0] =3D sizeof( binaryIntVal );
> >     paramFormats[0] =3D 1;
>
> You're apparently trying to pass this parameter as an int4 ...
>
> >     res =3D PQexecParams( m_db, "SELECT * FROM abcatfmt WHERE abf_type =
=3D
> > $1", 1, nullptr, paramValues, paramLengths, paramFormats, 1 );
>
> ... but given that you didn't specify any data type, I think the
> parser will fall back to assuming that $1 is the same type as
> "abf_type", whatever that is.  Passing data in binary is not at all
> forgiving about getting the data type right.

abf_type is declared as smallnt:

    queries.push_back( L"CREATE TABLE IF NOT EXISTS abcatfmt(abf_name
char(30) NOT NULL, abf_frmt char(254), abf_type smallint, abf_cntr
integer, PRIMARY KEY( abf_name ));" );

Thank you.

>
>                         regards, tom lane