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

Marthin Laubscher <>
Tue Dec 19 10:26:44 CET 2006


Thanks Ingela, much appreciated and oh yes, congratulations with the family
addition.

Marthin

> Ingela Anderton Andin wrote:
> > 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.
> 
> Well yes, I actually found that bug now :). It was a week ago or so when
> it finally made the
> top of the priority list, after my return from parental leave (which I am
> afraid prolonged the process).
> So now you can go ahead and us it. Well as soon as you get the next open
> source release that is ;)
> 
> > 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.
> 
> Well pointer errors are nasty things that may seem to relate the problem
> to things
> that are not at all related. It had nothing to do with the socket
> communication.
> Maybe I should point out that the reason the odbc-portprogram uses socket
> communication at
> all and not uses the normal erlang-port-mechanism, except for initially,
> is that some odbc-drivers have done
> unexpected things with stdin/stdout causing unexpected messages to be
> received by the erlang side.
> 
> Regards Ingela - OTP team
> 
> 
> 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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