def empty(self):
'''Check if the transaction contains query data or not.
If there is no query data the transaction does not perform any
operation in the database.'''
for c in itervalues(self._cachepipes):
if c.pipe:
return False
return self.emptypipe()
def clear(cls, ids):
if ids:
for id in ids:
s = self._structs.pop(id,None)
if s:
try:
s.delete()
except ConnectionError:
pass
else:
for s in itervalues(cls._structs):
try:
s.delete()
except ConnectionError:
pass
cls._structs.clear()
def values(self, keys = None):
'''Generator overvalues.
If keys is not supplied, it is a generator over value items.
No transaction involved in this function.'''
if self.cache:
if self.keys:
cache = self.cache.get
for key in keys:
yield cache(key)
else:
for item in itervalues(self.cache):
yield item
else:
kloads = self.pickler.loads
vloads = self.value_pickler.loads
if keys:
dumps = self.pickler.dumps
keys = [dumps(k) for k in keys]
for item in self._items(self.backend.cursor(),keys):
yield vloads(item)
else:
for key,val in self._items(self.backend.cursor(),keys):
yield vloads(val)
def new(self):
'''The set of all new instances within this ``SessionModel``. This
instances will be inserted in the database.'''
return tuple(itervalues(self._new))
def dirty(self):
'''The set of instances in this :class:`Session` which have
been modified.'''
return frozenset(chain(*tuple((sm.dirty for sm
in itervalues(self._models)))))
def iterdirty(self):
'''Ordered iterator over dirty elements.'''
return iter(chain(itervalues(self._new), itervalues(self._modified)))
def deleted(self):
'''The set of all instance pks marked as `deleted` within this
:class:`Session`.'''
return tuple((p.pkvalue() for p in itervalues(self._deleted)))
def modified(self):
'''The set of all modified instances within this ``Session``. This
instances will.'''
return tuple(itervalues(self._modified))
def dirty(self):
'''The set of instances in this :class:`Session` which have
been modified.'''
return frozenset(
chain(*tuple((sm.dirty for sm in itervalues(self._models)))))
def iterdirty(self):
'''Ordered iterator over dirty elements.'''
return iter(chain(itervalues(self._new), itervalues(self._modified)))
def dirty(self):
'''set of all changed instances in the session'''
return frozenset(chain(*tuple((sm.dirty for sm\
in itervalues(self._models)))))
def deleted(self):
'''The set of all instances marked as 'deleted' within this
:class:`Session`.'''
return frozenset(itervalues(self._deleted))
def loaded(self):
'''The set of all unmodified, but not deleted, instances within this
:class:`Session`.'''
return frozenset(itervalues(self._loaded))
def modified(self):
"The set of all modified instances within this ``Session``"
return frozenset(itervalues(self._modified))
def modified(self):
'''The set of all modified instances within this ``Session``. This
instances will.'''
return tuple(itervalues(self._modified))
def deleted(self):
'''The set of all instance pks marked as `deleted` within this
:class:`Session`.'''
return tuple((p.pkvalue() for p in itervalues(self._deleted)))
def new(self):
'''The set of all new instances within this ``SessionModel``. This
instances will be inserted in the database.'''
return tuple(itervalues(self._new))