Anthony Baxter wrote:

I just bolted together from bits I scanned from CVS a 'MountedFileStorage' product. This allows you to use multiple ZODBs in a single Zope. It's something I've done "just for the hell of it" but thought that there might be other people out there who want to play with this stuff.

http://www.zope.org/Members/anthony/software/MountedFileStorage_hack/

It needs an up-to-date CVS.

As for why I've done this - I _really_ _really_ want multiple ZODB support - we have a couple of requirements for it. This was an excuse to fiddle and figure out how it works.

You did better than you think, Anthony. I was going to release the product I've been putting together, but your little product does virtually the same thing. Good work! There is, however, a major security problem with making it so easy to mount a FileStorage. In my product, per Jim's suggestion I set it up so that the user is required to create an External Method in order to mount a database. That actually makes things a little more flexible in that it provides you the ability to mount things other than FileStorages. There are still some issues with mounted databases. The primary issue is that they interact strangely with ZClasses. However, if you have the same ZClass defined in both the primary database and the mounted database, ZClasses seem to work fine. (I wouldn't bet my company on it, though.) The other issues are that you can't easily undo nor manage mounted databases. That is more of a UI problem which could be solved by product authors, however. I envision a product that would create a "mounted database manager" object. Inside the database manager you could add as many mount points as you want. The database manager object is where you would go to pack any of the mounted databases.

Please don't run this on a Zope which hasn't got a backed-up copy of the Data.fs.

... And please report any problems which you may think are being caused by the mount. http://www.zope.org/Wikis is a mounted database and it's running fine, but YMMV. Shane