On Mar 21, 2007, at 9:59 AM, Tres Seaver wrote:
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Jim Fulton wrote:
On Mar 21, 2007, at 6:41 AM, Chris Withers wrote:
Hi All,
Is there any existing method or script for rolling back a ZODB
(filestorage-backed in this case,
Back end to what?
if that makes it easier) to a certain point in time?
Do you actually want to modify the file? Or do you simply want to
access it as of a particular time.
There is already a mechanism for opening a file storage as of a
particular time.
eg: Make this Data.fs as it was at 9am this morning
If not, I'll be writing one, where should I add it to when I'm done?
Before we talk about adding it anywhere, I'd like to see the
semantics defined more clearly.
Chris could:
1. Open the existing file in time-travel mode (readonly, so that it
loads no transactions later than the given point). The 'stop'
parameter to the FileStorage initializer is the one which
triggers time-travel.
2. Open a new, writable filestorage.
3. Run 'copyTransactionsFrom' on the new storage, passing the old,
and then close the storages.
4. Restart his Zope with the new storage.
I wasn't asking about implementation.
Here are some questions:
- Should this create a new FileStorage? Or should it modify the
existing FileStorage in place?
- Should this work while the FileStorage is being used?
- Should this behave transactional?
Jim
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