Hello
I want to set an object's last modification time to match a certain date.
I see that this comes from the _p_mtime attribute and in cPersistence.c it
is derived from _p_serial.
But when I try to set explicitely _p_serial, there is a ConflictError:
ZODB.POSException.ConflictError: database conflict error (oid 0x104a,
serial this txn started with 0x035cfc63 2005-05-01 10:11:12.00,
serial currently committed 0x035f10fe1d242e66 2005-08-03 02:38:06.83)
Writting _p_serial used to work fine at least until Zope 2.6.x
(http://mail.zope.org/pipermail/zope-dev/2000-March/004020.html)
Now I'm using Zope 2.7.7.
Maybe I should not be playing with _p_serial, but how can I set the
object's last modification time? I want it to be in sync with an external
representation (stored in CVS).
This is a test script:
import Zope
from Acquisition import aq_base
from ZODB.TimeStamp import TimeStamp
from OFS.Folder import Folder
from DateTime import DateTime
Zope.configure('..\etc\zope.conf')
root = Zope.app()
# create a test folder, if it does not exist
if not 'test' in root.objectIds():
print 'Creating test folder'
test = Folder(id='test')
root._setObject('test',Folder(id='test'))
get_transaction().commit()
# I want to change its last-modification-time
target = aq_base(root.test)
print 'Test folder: %s _p_serial=%s _p_mtime=%s b_m_t=%s' % (target.id,
target._p_serial, DateTime(target._p_mtime),
target.bobobase_modification_time())
ts = TimeStamp(2005,5,1,10,11,12) # a sample timestamp
target._p_serial = repr(ts)
target._p_changed = 1
get_transaction().commit()
print 'target._p_serial modified OK'
print 'Test folder: %s _p_serial=%s _p_mtime=%s b_m_t=%s' % (target.id,
target._p_serial, DateTime(target._p_mtime),
target.bobobase_modification_time())
#output:
#Test folder: test _p_serial=_รพ$.f _p_mtime=2005/08/02 23:38:06.830 GMT-3
b_m_t=2005/08/02 23:38:06.830 GMT-3
#Traceback (most recent call last):
# File C:\Prog\Zope\Questor\bin\testserial.py, line 22, in ?
#get_transaction().commit()
# File C:\Prog\Zope\ZopeServer\lib\python\ZODB\Transaction.py, line 241,
in commit
#ncommitted += self._commit_objects(objects)
# File C:\Prog\Zope\ZopeServer\lib\python\ZODB\Transaction.py, line 356,
in _commit_objects
#jar.commit(o, self)
# File C:\Prog\Zope\ZopeServer\lib\python\ZODB\Connection.py, line 454,
in commit
#s=dbstore(oid,serial,p,version,transaction)
# File C:\Prog\Zope\ZopeServer\lib\python\ZODB\FileStorage.py, line 782,
in store
#serials=(oserial, serial))
#ZODB.POSException.ConflictError: database conflict error (oid 0x104a,
serial this txn started with 0x035cfc63 2005-05-01 10:11:12.00,
serial currently committed 0x035f10fe1d242e66 2005-08-03 02:38:06.83)
Gabriel Genellina
Softlab SRL
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