def delete_multi(keys, connection=None, dataset_id=None):
"""Delete the keys in the Cloud Datastore.
:type keys: list of :class:`gcloud.datastore.key.Key`
:param keys: The keys to be deleted from the datastore.
:type connection: :class:`gcloud.datastore.connection.Connection`
:param connection: Optional connection used to connect to datastore.
If not passed, inferred from the environment.
:type dataset_id: :class:`gcloud.datastore.connection.Connection`
:param dataset_id: Optional. The dataset ID used to connect to datastore.
If not passed, inferred from the environment.
:raises: EnvironmentError if ``connection`` or ``dataset_id`` not passed,
and cannot be inferred from the environment. ValueError if
one or more keys has a dataset ID not matching the passed /
inferred dataset ID.
"""
if not keys:
return
connection = _require_connection(connection)
dataset_id = _require_dataset_id(dataset_id, keys[0])
# We allow partial keys to attempt a delete, the backend will fail.
current = Batch.current()
in_batch = current is not None
if not in_batch:
current = Batch(dataset_id=dataset_id, connection=connection)
for key in keys:
current.delete(key)
if not in_batch:
current.commit()
def _require_dataset_id(dataset_id=None, first_key=None):
"""Infer a dataset ID from the environment, if not passed explicitly.
Order of precedence:
- Passed `dataset_id` (if not None).
- `dataset_id` of current batch / transaction (if current exists).
- `dataset_id` of first key
- `dataset_id` inferred from the environment (if `set_default_dataset_id`
has been called).
:type dataset_id: string
:param dataset_id: Optional.
:type first_key: :class:`gcloud.datastore.key.Key` or None
:param first_key: Optional: first key being manipulated.
:rtype: string
:returns: A dataset ID based on the current environment.
:raises: :class:`EnvironmentError` if ``dataset_id`` is ``None``,
and cannot be inferred from the environment.
"""
if dataset_id is not None:
return dataset_id
top = Batch.current()
if top is not None:
return top.dataset_id
if first_key is not None:
return first_key.dataset_id
dataset_id = _implicit_environ.get_default_dataset_id()
if dataset_id is None:
raise EnvironmentError('Dataset ID could not be inferred.')
return dataset_id
def _require_dataset_id(dataset_id=None, first_key=None):
"""Infer a dataset ID from the environment, if not passed explicitly.
Order of precedence:
- Passed `dataset_id` (if not None).
- `dataset_id` of current batch / transaction (if current exists).
- `dataset_id` of first key
- `dataset_id` inferred from the environment (if `set_default_dataset_id`
has been called).
:type dataset_id: string
:param dataset_id: Optional.
:type first_key: :class:`gcloud.datastore.key.Key` or None
:param first_key: Optional: first key being manipulated.
:rtype: string
:returns: A dataset ID based on the current environment.
:raises: :class:`EnvironmentError` if ``dataset_id`` is ``None``,
and cannot be inferred from the environment.
"""
if dataset_id is not None:
return dataset_id
top = Batch.current()
if top is not None:
return top.dataset_id
if first_key is not None:
return first_key.dataset_id
dataset_id = _implicit_environ.get_default_dataset_id()
if dataset_id is None:
raise EnvironmentError('Dataset ID could not be inferred.')
return dataset_id
def delete(keys, connection=None, dataset_id=None):
"""Delete the keys in the Cloud Datastore.
:type keys: list of :class:`gcloud.datastore.key.Key`
:param keys: The keys to be deleted from the datastore.
:type connection: :class:`gcloud.datastore.connection.Connection`
:param connection: Optional connection used to connect to datastore.
If not passed, inferred from the environment.
:type dataset_id: :class:`gcloud.datastore.connection.Connection`
:param dataset_id: Optional. The dataset ID used to connect to datastore.
If not passed, inferred from the environment.
:raises: EnvironmentError if ``connection`` or ``dataset_id`` not passed,
and cannot be inferred from the environment. ValueError if
one or more keys has a dataset ID not matching the passed /
inferred dataset ID.
"""
if not keys:
return
connection = _require_connection(connection)
dataset_id = _require_dataset_id(dataset_id, keys[0])
# We allow partial keys to attempt a delete, the backend will fail.
current = Batch.current()
in_batch = current is not None
if not in_batch:
current = Batch(dataset_id=dataset_id, connection=connection)
for key in keys:
current.delete(key)
if not in_batch:
current.commit()
def put(entities, connection=None, dataset_id=None):
"""Save the entities in the Cloud Datastore.
:type entities: list of :class:`gcloud.datastore.entity.Entity`
:param entities: The entities to be saved to the datastore.
:type connection: :class:`gcloud.datastore.connection.Connection`
:param connection: Optional connection used to connect to datastore.
If not passed, inferred from the environment.
:type dataset_id: :class:`gcloud.datastore.connection.Connection`
:param dataset_id: Optional. The dataset ID used to connect to datastore.
If not passed, inferred from the environment.
:raises: EnvironmentError if ``connection`` or ``dataset_id`` not passed,
and cannot be inferred from the environment. ValueError if
one or more entities has a key with a dataset ID not matching
the passed / inferred dataset ID.
"""
if not entities:
return
connection = _require_connection(connection)
dataset_id = _require_dataset_id(dataset_id, entities[0].key)
current = Batch.current()
in_batch = current is not None
if not in_batch:
current = Batch(dataset_id=dataset_id, connection=connection)
for entity in entities:
current.put(entity)
if not in_batch:
current.commit()
def current():
"""Return the topmost transaction.
.. note:: if the topmost element on the stack is not a transaction,
returns None.
:rtype: :class:`gcloud.datastore.transaction.Transaction` or None
"""
top = Batch.current()
if isinstance(top, Transaction):
return top
def current():
"""Return the topmost transaction.
.. note:: if the topmost element on the stack is not a transaction,
returns None.
:rtype: :class:`gcloud.datastore.transaction.Transaction` or None
"""
top = Batch.current()
if isinstance(top, Transaction):
return top
def _require_connection(connection=None):
"""Infer a connection from the environment, if not passed explicitly.
:type connection: :class:`gcloud.datastore.connection.Connection`
:param connection: Optional.
:rtype: :class:`gcloud.datastore.connection.Connection`
:returns: A connection based on the current environment.
:raises: :class:`EnvironmentError` if ``connection`` is ``None``, and
cannot be inferred from the environment.
"""
if connection is None:
top = Batch.current()
if top is not None:
connection = top.connection
else:
connection = _implicit_environ.get_default_connection()
if connection is None:
raise EnvironmentError('Connection could not be inferred.')
return connection
def _require_connection(connection=None):
"""Infer a connection from the environment, if not passed explicitly.
:type connection: :class:`gcloud.datastore.connection.Connection`
:param connection: Optional.
:rtype: :class:`gcloud.datastore.connection.Connection`
:returns: A connection based on the current environment.
:raises: :class:`EnvironmentError` if ``connection`` is ``None``, and
cannot be inferred from the environment.
"""
if connection is None:
top = Batch.current()
if top is not None:
connection = top.connection
else:
connection = _implicit_environ.get_default_connection()
if connection is None:
raise EnvironmentError('Connection could not be inferred.')
return connection
def delete(keys, connection=None):
"""Delete the keys in the Cloud Datastore.
:type keys: list of :class:`gcloud.datastore.key.Key`
:param keys: The keys to be deleted from the datastore.
:type connection: :class:`gcloud.datastore.connection.Connection`
:param connection: Optional connection used to connect to datastore.
"""
if not keys:
return
connection = connection or _implicit_environ.CONNECTION
# We allow partial keys to attempt a delete, the backend will fail.
current = Batch.current()
in_batch = current is not None
if not in_batch:
dataset_id = _get_dataset_id_from_keys(keys)
current = Batch(dataset_id=dataset_id, connection=connection)
for key in keys:
current.delete(key)
if not in_batch:
current.commit()
def put(entities, connection=None):
"""Save the entities in the Cloud Datastore.
:type entities: list of :class:`gcloud.datastore.entity.Entity`
:param entities: The entities to be saved to the datastore.
:type connection: :class:`gcloud.datastore.connection.Connection`
:param connection: Optional connection used to connect to datastore.
"""
if not entities:
return
connection = connection or _implicit_environ.CONNECTION
current = Batch.current()
in_batch = current is not None
if not in_batch:
keys = [entity.key for entity in entities]
dataset_id = _get_dataset_id_from_keys(keys)
current = Batch(dataset_id=dataset_id, connection=connection)
for entity in entities:
current.put(entity)
if not in_batch:
current.commit()