[eluser]obiron2[/eluser]
you cant.
The trigger is on the database and will be envoked when you insert/update/delete/read a record irrespective of how the transaction is initiated - thats why you use a trigger.
If you mean a stored procedure, that is different, but I still don't think you can call a stored proc through the database class and active records . You could however write do db->query("EXEC My_StoredProcedure(param1,param2)") but i'm not sure what you would get back as a results set because the SP does not have to generate a result, it could simply be doing a background database update (e.g. check for emails to be sent)
Obiron