def _make_txn_selector(self):
"""Helper for :meth:`read`."""
if self._transaction_id is not None:
return TransactionSelector(id=self._transaction_id)
if self._read_timestamp:
key = 'read_timestamp'
value = _datetime_to_pb_timestamp(self._read_timestamp)
elif self._min_read_timestamp:
key = 'min_read_timestamp'
value = _datetime_to_pb_timestamp(self._min_read_timestamp)
elif self._max_staleness:
key = 'max_staleness'
value = _timedelta_to_duration_pb(self._max_staleness)
elif self._exact_staleness:
key = 'exact_staleness'
value = _timedelta_to_duration_pb(self._exact_staleness)
else:
key = 'strong'
value = True
options = TransactionOptions(
read_only=TransactionOptions.ReadOnly(**{key: value}))
if self._multi_use:
return TransactionSelector(begin=options)
else:
return TransactionSelector(single_use=options)
def _make_txn_selector(self):
from google.cloud.proto.spanner.v1.transaction_pb2 import (
TransactionOptions, TransactionSelector)
if self._transaction_id:
return TransactionSelector(id=self._transaction_id)
options = TransactionOptions(
read_only=TransactionOptions.ReadOnly(strong=True))
if self._multi_use:
return TransactionSelector(begin=options)
return TransactionSelector(single_use=options)
def _make_txn_selector(self):
from google.cloud.proto.spanner.v1.transaction_pb2 import (
TransactionOptions, TransactionSelector)
options = TransactionOptions(
read_only=TransactionOptions.ReadOnly(strong=True))
return TransactionSelector(single_use=options)
def _make_txn_selector(self):
"""Helper for :meth:`read`.
:rtype:
:class:`~.transaction_pb2.TransactionSelector`
:returns: a selector configured for read-write transaction semantics.
"""
self._check_state()
return TransactionSelector(id=self._id)