def destroy(self, storable, destroy_related_storables=False):
"""
Destroy the provided Storable.
@see: L{IFactory.destroy()}
@param storable: the object you wish to destroy
@type storable: L{storable.Storable}
@param destroy_related_storables: should the items returned by
L{Storable.get_related_storables()} be automatically destroyed?
@type destroy_related_storables: bool
"""
if not(storable.is_new()):
child_list = storable.get_related_storables()
id_list = []
while(child_list and destroy_related_storables):
child = child_list.pop()
child_id = self.fetch_id(child)
child_table = child.get_table()
if(child_table not in self._factories):
raise LookupError('There is no factory registered for the table `%s`' % child_table)
factory = self._factories[child_table]
if(child_id in id_list and factory.uses_guids()):
#raise AssertionError('Found circular storable reference during destroy')
continue
child_list.extend(child.get_related_storables())
self._destroy(child)
id_list.append(child_id)
self._destroy(storable)
def _save(self, storable, factory):
"""
Internal function that is responsible for doing the
actual saving.
"""
if not(storable.is_dirty()):
return False
table = storable.get_table()
data = storable.get_data()
locks_allowed = (not bool(self.req)) or self.req.app.config.get('use_db_locks', True)
use_locks = False
primary_key = factory.get_primary_key()
if(storable.is_new()):
if(factory.uses_guids()):
data[primary_key] = self.fetch_id(storable)
elif(locks_allowed):
use_locks = True
self.pool.runOperation('LOCK TABLES `%s` WRITE' % table)
else:
raise RuntimeError("Broken program logic is trying to lock an unlockable database.")
query = sql.build_insert(table, data)
else:
query = sql.build_update(table, data, {primary_key:storable.get_id()})
self.log(query)
try:
self.pool.runOperation(query)
if not(factory.uses_guids()):
if not(storable.get_id()):
rows = self.pool.runQuery('SELECT MAX(%s) AS `id` FROM `%s`' % (primary_key, table))
new_id = rows[0]['id']
storable.set_id(new_id)
finally:
if(use_locks):
self.pool.runOperation('UNLOCK TABLES')
storable.clean()
storable.set_new(False)
storable.set_factory(factory)
return True
