HolgerSchmidt wrote at 2003-7-3 15:07 +0200:
Wednesday, 2003-07-11 21:10 Dieter Maurer wrote: ... DM> > I think it should be possible to "redirect" this Metadata, so a DM> > PROPPATCH would save the Metadata to 'MY' MySQL-DB and a PROPFIND DM> > would get it from 'MY' MySQL-DB ... DM> > DM> > Has anybody ever done something like this before?
DM> I did something like this but for general attributes DM> (not WebDAV properties).
DM> A word of warning:
DM> You get lots of nasty problems when you distribute attribute DM> storage between ZODB and something external.
DM> Moving and copying must be treated carefully. DM> Export/Import is likely to break. DM> Undo and Versions will bring your system in an inconsistent state.
DM> Apart from that, it is not too difficult:
DM> Attribute access can be handled by letting "__getattr__" DM> fetch the attributes from the database on demand.
hmm ... this works as far as I do not change any attributes via WebDAV or the "Zope Management Interface" ... If I change these attributes every later WebDAV-Request returns the values i changed the attributes to even if i return some other value in my __getattr__-Method: ... DM> For modification, the "PropertyManager" methods can DM> be overridden to update the values in the database DM> (be careful, if you delay update until transaction DM> commit (for efficiency). It may be too late then to DM> register the DA.).
You should read my complete answer ;-) Apparently, you stopped reading after the "attribute access" section and ignored the "modification" section. Please try again. The "modification" section is quoted above... Dieter