[ZODB-Dev] ZODB and ORBit-Python problems

[Greg Ward]

On 18 May 2001, Christian Robottom Reis said:
> I'm working on getting ORBit-Python and ZODB working together lately, and
> I've hacked tonight a minimal working set of changes into O-P. However,
> even though I get creation and method call correctly, ZODB now doesn't
> want to pickle my objects, since they are of a C type defined in O-P.

It is certainly possible to write extension types that can be pickled:

  >>> from cPickle import loads, dumps
  >>> from mx.DateTime import now
  >>> t = now()
  >>> t
  <DateTime object for '2001-05-18 09:17:40.40' at 8108810>
  >>> type(t)
  <type 'DateTime'>
  >>> dumps(t)
  'cmx.DateTime\n_DT\np1\n(I730623\nF33460.407789945602\ntRp2\n.'
  >>> dumps(t,1)
  'cmx.DateTime\n_DT\nq\x01(J\xff%\x0b\x00G@\xe0V\x8d\x0c\x9d\x80\x00tRq\x02.'
  >>> loads(_)
  <DateTime object for '2001-05-18 09:17:40.40' at 81496e8>

We have a ZODB (accessed via ZEO) that uses mx.DateTime objects all over
the place, so putting random extension types into a ZODB is not a
problem.

Can you pickle ORBit-Python objects outside of a ZODB context, ie. does
something like the above dialogue work for O-P objects?  If not, it's
O-P's fault for not supporting the pickle protocol.  If so, I dunno who
to blame.

        Greg
-- 
Greg Ward - software developer                gward@mems-exchange.org
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