RE: Incremental development

> On Fri, 2006-01-13 at 13:08 +0000, Aidan Slingsby wrote:
> > When a new method is added to an ozone object, existing persistent=20
> > instances in the database no longer work.  If there a way of easily=20
> > updating all the instances in the database to the new class=20
> > definition, or can this only be done by keeping the old class=20
> > definition too and create new instances of the new class, copying =
the=20
> > data over and deleting the old ones (or using XML or ASCII=20
> > export/import)?  With relational databases, it is relatively easy to =

> > change table design without corrupting the data - can this be the =
case=20
> > in Ozone too (if I do something differently).
>=20
> What exactly do you mean by 'no longer work'?

What I mean is that if write a CarImpl class, store some data in an =
Ozone
database, then edit the code and add fields and methods to get and set a
colour for the car, run OPP again and try and retrieve a car (stored =
before
the class was modified) it will say that the class isn't found (if I'm =
not
mistaken).  I can understand why adding a new field would cause problems
(the binary storage is different).  Anyway, in a relational database, =
one
could just add a new 'colour' column.  I wondered if something like this
could easily be done in Ozone.

Thanks,
Aidan.



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