[erlang-questions] odbc problem (revived from 2005-04 archive)

Marthin Laubscher <>
Sat Dec 16 01:06:20 CET 2006


Folks,

Any news about odbc:param_query on windows? (Beyond the obvious "don't use
it" that is) 
That 20 months and several releases (and more if we take Ingela's response
to mean that it had been known to be broken for some time before Anders
actually reported it) hasn't solved this elusive mystery yet is a worry of
note.
By the looks of it the problem relates not to the odbc code itself but to
the socket communication between port driver and erlang, the likes of which
are used far and wide. Finding the cause of this might help many drivers
that essentially used odbcserver.c as a reference for implementing a port
driver (like I oh-so-nearly did) or maybe someone did just that and
subsequently ran into the same bug has already identified and resolved the
cause of the problem in which case fixing odbcserver.c might become a
doddle.

Marthin

One year and eight months ago Ingela Anderton wrote:
> One year and eight months ago Anders Nygren wrote:
> > Hi 
> > I am trying to use odbc and have run into a strange problem.
> > Using R10B-2 on Windows XP, with Microsoft SQL Server2000.
> The data is inserted in the table on the sql server but for some
> reason the connection is lost.
> Well you must be the first one that tried to use parameterized queries
> on a windows platform. Our automated test cases for parameterized
> queries have failed on windows for some time (works fine on solaris),
> but before I wrote the new configure script I could not reproduce the
> fault. When I built only the odbc application the old way it always
> worked. Now I can reproduce it but if I try to debug compile it to
> get some more information it starts working again. All efforts so far
> has alas led nowhere. The exit code indicates that the c function
> send/4 that sends a message on a socket has failed returning -1 which
> suggest something else has gone wrong and somehow messes up the input to
> send. I was hoping we would have found the problem by now but as it
> does not have top priority it might be time to at least document it
> as an known problem!
> 
> > I have tried to trace the odbc driver with {trace_driver,on}
> > but it does not look very interesting, (but what do I know),
> > I have attatched it anyway.
> Well thank you I am not sure it will help but I will take a look at
> it you never know! A problem though is that I have many other things to
> do the are higher prioritized so it might take a while before I have
> time to really investigate this further.
> 
> [...]
> > ** {port_exit,socket_send_message_body_failed}
> [...]
> 
> -- 
> /Ingela - OTP team
> 







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