Re: empty strings select as null bug

That was some great teamwork. Thanks for the fix, everyone!

On Thu, Jun 11, 2015 at 3:17 AM, Geoff Montee <[email protected]>
wrote:

> On Wed, Jun 10, 2015 at 10:39 PM, LacaK <[email protected]> wrote:
> >
> > I am using for testing NULL dbdata(), which should return nil for NULL
> data.
> > (In my case I know, that column exists)
> >
> > From Sybase documentation:
> > "A NULL BYTE pointer is returned if there is no such column or if the
> data
> > has a null value. To make sure that the data is really a null value, you
> > should always check for a return of 0 from *dbdatlen*."
> >
> > From Microsoft documentation:
> > "A NULL BYTE pointer is returned if there is no such column or if the
> data
> > has a null value. To make sure that the data is really a null value,
> check
> > for a return of 0 from *dbdatlen*."
> >
> > So you can use: dbdata()==nil && dbdatlen()==0
> >
>
> I decided to go with your test:
>
>
> https://github.com/GeoffMontee/tds_fdw/blob/b5f678cded099f9231473c520cf1dbe8363a470a/src/tds_fdw.c#L1855
>
> I think Jeff's bug is fixed.
>
> It's really good to know that dbdatlen() can return 0 in the case of
> an empty string.
>
> Thanks for your help, everyone!
>
> Geoff
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