Jason Spisak wrote:
> The only problem I am dealing with is size.
> What kind of a transaction will that be?
> Huge, no doubt.
> I would run out of space to buffer it. Does Zope do subtransactions now,
> or is that still just the ZCatalog?
zope has done subtransactions for a while, i'm not sure if this predates
zcatalog or not ( i assume'd it does).
just call get_transaction.commit(1) to save work. and call
get_tranaction.commit() when you're done. i'm in the process of writing
an advanced transaction how-to which will hopefully give some more
enlightenment on this process, but i've been busy with work so i don't
expect to have it public for another week.
> Also, I am running on stock RH6.2 linux and to double my ZODB puts me near
> the 2 gig file limit. Not as much of a concern as a pain in my neck. Is
> it faster to modify my installation to allow > 2GB or create from
you could create the python product instances in a mounted db.
> > It should be Really Easy (TM) to write an external method that grabs
> > the data from your zclasses, and then creates a new instance of your
> > python object with the zclass data. It's just a big for loop.
> > -Brett
> > >>>>> "Jason" == Jason Spisak <[EMAIL PROTECTED]> writes:
> > Jason> Shane:
> > >> Jason Spisak wrote:
> > >> > > > And now the big question...
> > >> > > >
> > >> > > > How do you migrate and existing application from ZClasses to Python
> > >> > > > products? I've got about 50,000 objects. Can it be done or am I
> > >> > > > with ZClasses?
> > >> > >
> > >> > > Andy McKay writes:
> > >> > >
> > >> > > Well the number of objects doesnt really matter, but migrating it from
> > >> > > ZClass to Python - Ive never heard of that happening. It would be a cool
> > >> > > project though.
> > >>
> > >> The hard part (which probably isn't very hard after all :-) ) is writing
> > >> the product that performs the same function as the ZClass. Once that's
> > >> done, a fifteen-line external method (that doesn't use any special
> > >> voodoo) can convert all instances.
> > >>
> > >> Shane
> > Jason> Perhaps what I should do is just get the data out, and create new
> > Jason> all via an external method. The migration isn't really a 1 for 1
> > Jason> situation. I am trying to address shortcomings like not having a
> > Jason> "dictionary" type property in Zope properties, etc.. So the
> > Jason> will be different anyway. I guess an export to XML gives me all the
> > Jason> in the objects, right? Then I could use that as a map to construct new
> > Jason> instances in a different implementation.
> > Jason> Thanks for all the answers,
> > Jason> Jason
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