[Python-Dev] 3rd-party dbms (original) (raw)

Brett Cannon brett at python.org
Thu Sep 4 21:03:07 CEST 2008

On Thu, Sep 4, 2008 at 11:59 AM, Oleg Broytmann <phd at phd.pp.ru> wrote:

Brett Cannon <brett at python.org> wrote:

for 3.1 there is nothing saying we can't change shelve and the dbm package to allow 3rd-party code to register with the dbm package such that bsddb can be used as needed behind the scenes. Many years ago I wrote toy hashes based on ZODB and MetaKit. Registering them with anydbm was easy: import anydbm anydbm.names.insert(len(anydbm.names)-1, ['ZODBhash', 'MKhash']) # Insert before dumbdbm More complex part was to make whichdb to recognize those hashes. I just monkey-patched whichdb. If I were doing this now I'd do something similar to atexit module - every hash module will register its own test function, and whichdb will call them in turn until it finds which db it is.

That's what I figured could happen. And give dbm.any a public API to register with it instead of setting a private attribute.

-Brett

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