[freetds] dbbind funny

Thompson, Bill D (London) bill_d_thompson at ml.com
Fri Jun 11 06:50:21 EDT 2004

Further investigation shows that the -1 varlen is supported by Sybase
It seems to function exactly the same as zero, in that the server assumes
that the host variable is long enough to hold any returned value.

> -----Original Message-----
> From:	Lowden, James K [SMTP:LowdenJK at bernstein.com]
> Sent:	10 June 2004 17:48
> To:	FreeTDS Development Group
> Subject:	RE: [freetds] dbbind funny
> > [mailto:freetds-bounces at lists.ibiblio.org]On Behalf Of 
> > Thompson, Bill D
> > Sent: June 10, 2004 11:09 AM
> > 
> > It turns out many of the unittests use -1 as a "varlen" parameter to
> > dbbind().
> > 
> > t0001.c:        if (SUCCEED != dbbind(dbproc, 2, STRINGBIND, 
> > -1, (BYTE *)
> > teststr)) {
> ...
> > any ideas on this ?
> Looks like an improvement, Bill.  For fixed types, of course, varlen is
> ignored.  But, yup, I don't find any documented support for a varlen of
> -1.  Should be zero.  
> Thanks for correcting this.  
> There's another bugaboo in this neighborhood that'd be nice to fix.  When
> freebcp encounters a data conversion error, its most common message is
> 20073 (Attempt to bulk-copy a NULL value).  What's happening is that
> dbconvert() fails, meaning that destlen is 0, causing the "converted" data
> to be nil, which is then sent to the server.  The server obviously sees
> zero-length data as null, and complains.  Unless the column is nullable,
> that is, in which case you, er, merely lose your data.  
> Don't know if your fixes address anything in this vicinity, but I thought
> I should mention it.  
> Regards, 
> --jkl
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