[Zope] WebDAV Metadata

[Dieter Maurer]

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