[top] / persistent / interfaces / IPersistentNoReadConflicts
_p_jar
(Attribute)
The data manager for the object.
The data manager implements the IPersistentDataManager interface. If there is no data manager, then this is None.
_p_oid
(Attribute)
The object id.
It is up to the data manager to assign this. The special value None is reserved to indicate that an object id has not been assigned. Non-None object ids must be non-empty strings. The 8-byte string ' '*8 (8 NUL bytes) is reserved to identify the database root object.
_p_serial
(Attribute)
The object serial number.
This member is used by the data manager to distiguish distinct revisions of a given persistent object.
This is an 8-byte string (not Unicode).
_p_changed
(Attribute)
The persistent state of the object.
This is one of:
The object state may be changed by assigning or deleting this attribute; however, assigning None is ignored if the object is not in the saved state, and may be ignored even if the object is in the saved state.
At and after ZODB 3.6, setting _p_changed to a true value for a ghost object activates the object; prior to 3.6, setting _p_changed to a true value on a ghost object was ignored.
Note that an object can transition to the changed state only if
it has a data manager. When such a state change occurs, the
register
method of the data manager must be called, passing the
persistent object.
Deleting this attribute forces invalidation independent of existing state, although it is an error if the sticky state is current.
* = required
__setstate__(state)
Set the object data.
_p_deactivate()
Deactivate the object.
Possibly change an object in the saved state to the ghost state. It may not be possible to make some persistent objects ghosts, and, for optimization reasons, the implementation may choose to keep an object in the saved state.
_p_invalidate()
Invalidate the object.
Invalidate the object. This causes any data to be thrown away, even if the object is in the changed state. The object is moved to the ghost state; further accesses will cause object data to be reloaded.
_p_activate()
Activate the object.
Change the object to the saved state if it is a ghost.
__getstate__()
Get the object data.
The state should not include persistent attributes ("_p_name"). The result must be picklable.
_p_independent()
Hook for subclasses to prevent read conflict errors.
A specific persistent object type can define this method and have it return true if the data manager should ignore read conflicts for this object.
There are no specific adapters registered for this interface.
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