[ZODB-Dev] ZODB 3.8.0a1 released

[Jim Fulton]

On May 12, 2007, at 1:00 PM, Paul Winkler wrote:

> On Sat, May 12, 2007 at 10:44:34AM -0400, Jim Fulton wrote:
>>
>> I've releases ZODB 3.8.0a1 tp PyPI:
>>
>>   http://www.python.org/pypi/ZODB3/3.8.0a1
>>
>> To see what's in 3.8.0, see the news file:
>>
>>   http://svn.zope.org/ZODB/trunk/NEWS.txt?rev=75692&view=auto
>>
>> This also includes the recent storage API standardization's, removal
>> of subtransactions, and deprecation of versions.  I should have
>> included that in the NEWS  file.  I'll fix that for the next release.
>
> I belatedly realized I have some old test code that uses a
> "subtransaction hack" to get a _p_jar and _p_oid:
>
>         try:
>             transaction.commit(1)
> 	    # do something needing _p_jar or _p_oid
>         finally:
>             transaction.abort(1)
>
> What's the correct thing to do now?

You can create a savepoint or you can use the connection add method  
to give a new object a _p_jar and _p_oid before a commit. (There are  
cases where the object of interest isn't handy and using a savepoint  
if more convenient.)

> Are savepoints relevant for this
> (ab)use?

Yes

> I don't think this idiom was ever formally documented, it
> was just an informal hack that I picked up somewhere (I forget from
> whom).

I've used this trick with savepoints.

Jim

--
Jim Fulton			mailto:jim at zope.com		Python Powered!
CTO 				(540) 361-1714			http://www.python.org
Zope Corporation	http://www.zope.com		http://www.zope.org