Omer Anson <oaanson@gmail.com> wrote:
> First of all, I apologise if I am posting this in the wrong place.
Not a bad place to start, I guess. If it gets into the realm of an
enhancement request or proposal it might belong on -hackers, but
since you're asking about how it might be done now, this is good.
> I would like to implement aspect-oriented programming in SQL. To
> that end, I figured I need a notification method whenever a stored
> procedure is executed (If possible, with rudimentary filtering).
Well, PostgreSQL doesn't have stored procedures, but it has
functions, which are similar in many respects.
> I have seen that this can be done with triggers for INSERT,
> UPDATE, and DELETE commands, and with RULES for SELECT commands.
>
> My question is: Is there a way to do this to stored procedures,
> without modifying the stored procedure code?
You could put "pointcut" schemas ahead of "concern" schemas (both
business logic and cross-cutting). The "join points" would
effectively be the business logic concern functions and the "advice"
would be embodied in the cross-cutting concern functions. You would
just need to build a tool to create the appropriate pointcut methods
to tie them together as desired, changing the searchpath locally, or
specifying concern function names with schema-qualification.
Of course, you could do the pointcut specification manually, one
method at a time, but that's not very "enterprisy".
-Kevin