def transaction(self, tx_type):
""" Open a transaction to Grakn on this keyspace
Can be used as `with session.transaction(grakn.TxType.READ) as tx: ...`
Don't forget to commit within the `with`!
Alternatively you can still do `tx = session.transaction(...); ...; tx.close()`
:param grakn.TxType tx_type: The type of transaction to open as indicated by the tx_type enum
"""
if self._closed:
raise ClientError("Session is closed")
# create a transaction service which hides GRPC usage
transaction_service = TransactionService(self.keyspace, tx_type,
self.credentials,
self._stub.transaction)
return Transaction(transaction_service)
def write(self):
transaction_service = TransactionService(
self._session_id, _TxType.WRITE, self._transaction_rpc_constructor)
return Transaction(transaction_service)
def read(self):
transaction_service = TransactionService(
self._session_id, _TxType.READ, self._transaction_rpc_constructor)
return Transaction(transaction_service)