I would expect an "ibase_query('select 1/0 from rdb$database;');" to
raise an exception.
Actually, this returns a well-defined result pointing to an empty
result set. ibase_errmsg is empty.
How can I catch this kind of exceptions? (User defined exceptions are
ignored as well, actually, I tried to capture these by an
error_handler but had no success and finally ended up with the above
example...).

Any hints are welcome!