Re: force re-retrieve from database

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Thanks everybody!
The example from Charles
$self->_attribute_delete($self->find_column('mycolname'));
works as expected ;-)

-Alex


> -----Urspr=FCngliche Nachricht-----
> Von: Zhuang Li [mailto:zli@xxxxxxxxxx.xxx]
> Gesendet: Dienstag, 14. Juni 2005 19:28
> An: Hartmaier Alexander; cdbi-talk@xxxxxx.xxxxx.xxx
> Betreff: RE: force re-retrieve from database
>=20
> I have a method to do this:
>=20
> sub _attribute_delete_all {
>     my $self =3D shift;
>=20
>     my %primary =3D map { $_=3D>1 } $self->primary_column;
>     my @columns =3D $self->all_columns;
>     for (@columns) {
>       $self->_attribute_delete($_) if (!$primary{$_});
> }
>=20
>=20
> Regards,
>=20
> John Zhuang Li
>=20
> > -----Original Message-----
> > From: Hartmaier Alexander [mailto:Alexander.Hartmaier@xxxxxxxxx.xx]
> > Sent: Tuesday, June 14, 2005 7:48 AM
> > To: cdbi-talk@xxxxxx.xxxxx.xxx
> > Subject: Re: force re-retrieve from database
> >
> > 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 '$self->_attribute_delete(('mycolname'));' would be
> enough but
> > I want an official ACK from the cdbi developers/maintainers...
> >
> > -Alex
> >
> > > -----Urspr=FCngliche Nachricht-----
> > > Von: Charles Bailey [mailto:bailey@xxxxxx.xxxxx.xxx]
> > > Gesendet: Dienstag, 14. Juni 2005 15:48
> > > An: Hartmaier Alexander; cdbi-talk@xxxxxx.xxxxx.xxx
> > > Betreff: Re: force re-retrieve from database
> > >
> > > --On June 14, 2005 10:44:33 AM +0200 Hartmaier Alexander
> > > <Alexander.Hartmaier@xxxxxxxxx.xx> wrote:
> > >
> > > >> If you're trying to update the object in hand, you should be =
able
> to
> > > >> just
> > > >> undef it and then retrieve it again.  If there are other copies
> in
> > > scope
> > > >> elsewhere, you may need to disable the object index or =
explicitly
> > > remove
> > > >> the object.
> > > >>
> > > >> Alternately, you could write an after_set_foo trigger that
> explicitly
> > > >> refresh the columns in question.  I'm a little surprised that
> this
> > > >> didn't
> > > >> happen automagically, since CDBI clears out columns after =
writing
> to
> > > the
> > > >> DB
> > > >> to account for this case.  Are the columns part of the object's
> > > primary
> > > >> key?
> > > >>
> > > >> --
> > > >> Regards,
> > > >> Charles Bailey  < bailey _at_ newman _dot_ upenn _dot_ edu >
> > > >> Newman Center at the University of Pennsylvania
> > > >
> > > > I don't update the datetime fields and therefore they don't get
> > > > automagically dropped and fetched from the db. They get updated =
by
> > > oracle
> > > > triggers.
> > > > I would be ok for me to tell cdbi to drop those fields too.
> > > > Maybe a '$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.
> > >
> > > 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.
> > >
> > > --
> > > Regards,
> > > Charles Bailey  < bailey _at_ newman _dot_ upenn _dot_ edu >
> > > Newman Center at the University of Pennsylvania


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