Re: force re-retrieve from database

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Ok I like the idea.
I looked in Class/DBI.pm for the update method to figure out how to =
delete
attributes from an object but didn't find what I wanted.
These lines seem to do what I want but I don't want to use internals =
that
might change in a new version:


$self->call_trigger('after_update', discard_columns =3D> =
\@changed_cols);

        # delete columns that changed (in case adding to DB modifies =
them
again)
        $self->_attribute_delete(@changed_cols);
        delete $self->{__Changed};

What does the first line do?
Do I have to take care of '$self->{__Changed}' to not break something =
else?

I THINK that '$self->_attribute_delete(('mycolname'));' would be enough =
but
I want an official ACK from the cdbi developers/maintainers...

-Alex

> -----Urspr=FCngliche Nachricht-----
> Von: Charles Bailey [mailto:bailey@xxxxxx.xxxxx.xxx]
> Gesendet: Dienstag, 14. Juni 2005 15:48
> An: Hartmaier Alexander; cdbi-talk@xxxxxx.xxxxx.xxx
> Betreff: Re: force re-retrieve from database
>=20
> --On June 14, 2005 10:44:33 AM +0200 Hartmaier Alexander
> <Alexander.Hartmaier@xxxxxxxxx.xx> wrote:
>=20
> >> If you're trying to update the object in hand, you should be able =
to
> >> just
> >> undef it and then retrieve it again.  If there are other copies in
> scope
> >> elsewhere, you may need to disable the object index or explicitly
> remove
> >> the object.
> >>
> >> Alternately, you could write an after_set_foo trigger that =
explicitly
> >> refresh the columns in question.  I'm a little surprised that this
> >> didn't
> >> happen automagically, since CDBI clears out columns after writing =
to
> the
> >> DB
> >> to account for this case.  Are the columns part of the object's
> primary
> >> key?
> >>
> >> --
> >> Regards,
> >> Charles Bailey  < bailey _at_ newman _dot_ upenn _dot_ edu >
> >> Newman Center at the University of Pennsylvania
> >
> > I don't update the datetime fields and therefore they don't get
> > automagically dropped and fetched from the db. They get updated by
> oracle
> > triggers.
> > I would be ok for me to tell cdbi to drop those fields too.
> > Maybe a '$obj->reretrieve(@fields)' method would be useful. If to
> > fieldnames are given the whole object is fetched again from the db =
or
> > only the fields given.
>=20
> OK, I understand; I hadn't been thinking broadly enough.  I'd =
recomment
> an
> after_update trigger (perhaps in your base class), that deletes these
> attributes from the object.  In essence, your class knows about some
> behind-the-scenes activity in your database that vanilla CDBI doesn't,
> so
> it should give CDBI a behind-the-scenes hint that'll allow the user to
> see
> the correct values without any extra work.
>=20
> --
> Regards,
> Charles Bailey  < bailey _at_ newman _dot_ upenn _dot_ edu >
> Newman Center at the University of Pennsylvania

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