[Zope-dev] API for creating sub-ZODBs

[Jim Fulton]

Anthony Pfrunder wrote:
> 
> On Tue, 19 Oct 1999, Andrew M. Kuchling wrote:
> 
> [snip]
> > conn = Zope.App.openExtraZODB( FileStorage, ('/tmp/mystorage.fs',) )
> > root = conn.root()
> > ... whatever ...
> >
> >       Thoughts?  I'm happy to write such a function, if someone will
> > tell me where it should go.
> 
> This is cool!  What would be even better is an example of a Folderish
> mixin which instead of storing its sub-objects within the main db it
> stores it within an external ZODB.  This would be effectively "mounting" a
> filesystem within another but still keeping them separate.  Anyone know
> how to do this?

This is something we plan to support at some point, possibly soon.
It's somewhat complicated because you have to manage the connections to
the various databases.  The connection management is rather tricky
because of the object references accross connections. An object in one
connection cache may reference an object in another connection.

> Taking this one-step-further we could enhance Products such that Products
> using this mixin will automatically store the contents of stuff within its
> Control Panel folder (like ZClasses) in a ZODB within its real world
> directory.  This means we can just zip it up to get both external Python
> code AND the ZClasses that it uses.  If I knew how the ZODB system works
> I'd help out ;).

Through the web products already zip up database objects, including ZClasses,
and code for you when you create an object distribution.  Currently, the data
gets imported into the destination Zope.  We are considering having products
contain read-only databases that get used directly, rather than getting imported.
This would allow some interesting optimizations and would almost certainly be
easier to integrate.

Stay tuned.

Jim

--
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