[freetds] SQL_DESC_UNSIGNED column attribute returns the wrong value for tinyint SQL Server columns

Frediano Ziglio freddy77 at gmail.com
Mon Apr 8 16:44:26 EDT 2013


It would be very helpful. Also I think is broken for Sybase unsigned types
then. I think in this case describecol test should be expanded and fixed.

Frediano


2013/4/2 James K. Lowden <jklowden at freetds.org>

> On Mon, 01 Apr 2013 16:03:22 -0600
> Sergio delaCruz <sergio.delacruz at oracle.com> wrote:
>
> > When dealing with a bug in our codebase
> > (http://bugs.mysql.com/bug.php?id=68084) we realized that the return
> > value that we get when requesting the SQL_DESC_UNSIGNED attribute via
> > the SQLColAttribute function for a SQL Server TINYINT column differs
> > from what one would expect (SQL_TRUE). Microsoft's drivers return the
> > correct value (TINYINT is by definition unsigned in T-SQL).
> >
> > Is this a bug in FreeTDS? Can you comment on this?
>
> Thanks for the problem report.
>
> src/odbc/odbc.c:3160:
>
>                 /* TODO perhaps TINYINY and BIT.. */
>                 drec->sql_desc_unsigned = SQL_FALSE;
>
> appears to be the source of your bug.
>
> >From many TODO comments in the function odbc_populate_ird, it would
> appear you will find other discrepancies.  We would be glad to apply
> any patches that bring the ird into closer conformance with Microsoft's
> driver.
>
> HTH.
>
> --jkl
>
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