Microsoft ODBC bug

Alan DeKok aland at
Fri Jul 5 08:04:31 CEST 2019

On Jul 4, 2019, at 5:10 PM, Dom Latter <freeradius-users at> wrote:
> Anyway, I have run ltrace to grab calls to the MS ODBC driver, from both
> freeradius and a small python test script (which doesn't exhibit this
> weird bug).
> These are the calls (sorted alphabetically) that are used by Freeradius:
> ...
> And these are the ones used by Python:
> ...
> What is noticeably absent from the freeradius output is SQLExecDirect

  That function is likely implemented in the library as a series of lower-layer calls.

> (the 'W' in the Python output just means it's Unicode); this despite
> that I have put debug output immediately before and after the line
> in the FR module that says:
> err_handle = SQLExecDirect(conn->stmt, odbc_query, strlen(query));
> so I know it is doing it... or trying to... or something.

  The question is what magic parameters to send to ODBC which say "don't do stupid things with numbers".

  Alan DeKok.

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