Re: [BUGS] BUG #11767: ODBC driver bug when fetching constant string columns

> On Fri, Oct 24, 2014 at 9:36 AM, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
> wrote:
>
> > On Wed, Oct 22, 2014 at 11:22 PM,  <keyurgovande(at)gmail(dot)com> wrote:
> > > The following bug has been logged on the website:
> > >
> > > Bug reference:      11767
> > > Logged by:          Keyur Govande
> > > Email address:      keyurgovande(at)gmail(dot)com
> > > PostgreSQL version: 9.0.3
> > You should update to 9.0.18, you are 3.5 years of bug fixes.
> >
>
> Ah I apologize, I chose the wrong version in the bug report dropdown. This
> bug was observed with the latest driver: psqlodbc-09.03.0300 connecting to
> a Postgres server 9.1.14.
>
I can confirm that this bug exists in psqlodbc-09.03.0300 connecting to PostgreSQL 9.3.5.
>
> >
> > > If we run a SELECT statement like: SELECT id, varchar_col, date_col,
> > 'random
> > > string' as random;
> > > via ODBC, then the last column comes back as junk into PHP.
> > >
> > > In PHP we use the SQL_DESC_OCTET_LENGTH to figure out how many bytes to
> > > allocate. But for that column, SQL_DESC_OCTET_LENGTH returns 0 and we
> > don't
> > > allocate enough space.
> > >
> > > The driver issue seems to be that when SQLColAttributes() is called with
> > > SQL_COLUMN_TYPE for column 'random', it returns SQL_VARCHAR even though
> > the
> > > PG type is PG_TYPE_UNKNOWN. The promotion is happening here:
> > >
> >
http://git.postgresql.org/gitweb/?p=psqlodbc.git;a=blob;f=pgtypes.c;h=4ce7636b69d371d9f511d492c68013f070e3b32a;hb=HEAD#l665
> > >
> > > I think the same promotion needs to happen when fetching octet-length
> > here:
> > >
> >
http://git.postgresql.org/gitweb/?p=psqlodbc.git;a=blob;f=pgtypes.c;h=4ce7636b69d371d9f511d492c68013f070e3b32a;hb=HEAD#l1275
> > >
> > > Thoughts? This is not a problem when using the Vertica ODBC driver for
> > > example.
> > >
> > > A temporary workaround is to use a cast thusly: SELECT id, varchar_col,
> > > date_col, varchar 'random string' as random;
> > > This was reported to the PHP project (
> > https://bugs.php.net/bug.php?id=68087)
> > > but it seems like a Postgres ODBC driver bug.
> > pgsql-odbc is more adapted for a bug report on the ODBC driver. I am
> > moving the thread there.
> > --
> > Michael
> >
Jeremy Faith
Tyco Safety Products/CEM Systems Ltd.

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