FreeTDS Development Group

[Matthew Gates <MGates AT redplc.com>]

>
> [explanation of relationship between freetds and unixodbc]
>
> Hopefully this clears things a bit.
>
> Igor.
>

Thank you.  I'm getting there.  I found that the implementation
of the SQLBindCol function is taken from libtdsodbc.so which is
specified in unixodbc's odbcinst.ini file in the

 [TDS]
 Driver = /path/to/libtdsodbc.so

By updating odbcinst.ini I managed to get my modified version of
SQLBindCol to execute.  The first iteration simply added a syslog
call to verify that I'm editing in the correct place.  Now comes
the hard part...

I cannot output debugging information every call... it's just
too verbose and impacts performance / log sizes too much (the
problem only occurs about once a week (if that)).

What I want to do it get SQLBindCol to populate a structure
with debugging output.  When the problem occurs (I can tell in
the calling program because an exception gets raised), I want
to dump this debugging output to syslog.  I have to use an object
local to the calling routine because the program is multi-
threaded, making static objects difficult to use.

I want to pass a pointer to a debugging store object as an
additional parameter to SQLBindCol from the calling program,
which means adding a new ODBC API call to unixODBC and
implementing it in the FreeTDS driver, which I'm working on now.

If anyone has an alternative strategy for doing this I'd love
To hear it.  :)

Matthew


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