[schooltool-dev] Deleting objects with ZEO

[Brian Sutherland]

On Mon, Jun 18, 2007 at 01:56:29AM -0400, Will Dickerson wrote:
> I am using a ZEO client with schooltool for use with my SIF Pull Agent. I'm
> using a simple dictionary as a queue in the ZODB, however when I attempt to
> delete items from the dictionary, the object inside of the database remains
> unchanged. Is there an extra step besides transaction.commit()?

Ok, so my ZODB-fu is not that good, but I'm pretty sure a normal
dictionary doesn't notify the Persistence machinery when it's been
changed.

Perhaps you can try using a btree dict of some sort:

from BTrees.IOBTree import IOBTree
from BTrees.OOBTree import OOBTree

queue = IOBTree()

This was pretty useful for me:

http://www.zope.org/Documentation/Books/ZDG/current/Persistence.stx

>
>   >>> queue = openDb()['queue']
>   >>> queue
>   {'Hamburger': 'Foobar'}
>   >>> queue.clear()
>   >>> queue
>   {}
>   >>> transaction.commit()
>   >>> closeDb()
>   >>> queue = openDb()['queue']
>   >>> queue
>   {'Hamburger': 'Foobar'}
>
> The following is how I open and close the database in the real application.
>
> from ZODB import DB
> from ZEO import ClientStorage
>
> def openDb(self):
>    storage = ClientStorage.ClientStorage(self.conf['dbName'])
>    db = DB(storage)
>
>    # open cursor and get root
>    self.cx = db.open()
>    self.dbroot = self.cx.root()
>
>    stRoot = self.dbroot.setdefault('stAgent', {})
>    stRoot.setdefault('queue', {})
>
>
> def closeDb(self):
>    self.cx.close()

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-- 
Brian Sutherland