I am not a Firbeird expert but I can help you debug this.
Can you execute that line from a normal sql shell?

Massimo

On Mar 10, 5:21 pm, Horst <[email protected]> wrote:
> See error traceback below - the same code, run through sqlite or
> postgres works just fine.
> However, during a transitional period, I have to use an already
> existing firebird database.
> Any idea how this error could be fixed? I have tried with both
> firebird 2.0 and firebird 2.1 servers. Accessing the database with
> python+ kinterbasdb driver works just fine
> The error happens regardless whether I define any tables or not,
> regardless whether I use auth etc. or not - even an empty models/db.py
> excpet for the db=... line) will trigger the error
>
> Traceback (most recent call last):
>   File "/home/hherb/src/web2py/gluon/restricted.py", line 98, in
> restricted
>     exec ccode in environment
>   File "/home/hherb/src/web2py/applications/drugref/models/db.py",
> line 5, in <module>
>     db=SQLDB('firebird://dbuser:[email protected]:3050/drugref.fdb')
>   File "/home/hherb/src/web2py/gluon/sql.py", line 762, in __init__
>     self._execute('SET NAMES UTF8;')
>   File "/home/hherb/src/web2py/gluon/sql.py", line 761, in <lambda>
>     **b)
> OperationalError: (-901, 'begin transaction: \n  invalid parameter in
> transaction parameter block')
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