def begin_transaction(self, project):
"""Begin a transaction.
Maps the ``DatastoreService.BeginTransaction`` protobuf RPC.
:type project: string
:param project: The project to which the transaction applies.
:rtype: bytes
:returns: The serialized transaction that was begun.
"""
request = _datastore_pb2.BeginTransactionRequest()
response = self._datastore_api.begin_transaction(project, request)
return response.transaction
def begin_transaction(self, dataset_id):
"""Begin a transaction.
Maps the ``DatastoreService.BeginTransaction`` protobuf RPC.
:type dataset_id: string
:param dataset_id: The ID dataset to which the transaction applies.
:rtype: bytes
:returns: The serialized transaction that was begun.
"""
request = _datastore_pb2.BeginTransactionRequest()
request.isolation_level = (
_datastore_pb2.BeginTransactionRequest.SERIALIZABLE)
response = self._rpc(dataset_id, 'beginTransaction', request,
_datastore_pb2.BeginTransactionResponse)
return response.transaction