import uuidfrom google.cloud importdatastoreunique = str(uuid.uuid4())[0:8]client =datastore.Client(namespace='ns{}'.format(unique))

.. doctest:: batch

>>> entity1 = datastore.Entity(client.key('EntityKind', 1234))>>> entity2 = datastore.Entity(client.key('EntityKind', 2345))>>> key3 = client.key('EntityKind', 3456)>>> batch = client.batch()>>> batch.begin()>>> batch.put(entity1)>>> batch.put(entity2)>>> batch.delete(key3)>>> batch.commit()

You can also use a batch as a context manager, in which casecommit will be called automatically if its block exits withoutraising an exception:

.. doctest:: batch

>>> with client.batch() as batch:...     batch.put(entity1)...     batch.put(entity2)...     batch.delete(key3)

By default, no updates will be sent if the block exits with an error:

.. doctest:: batch

>>> def do_some_work(batch):...    return>>> with client.batch() as batch:...     do_some_work(batch)...     raise Exception()  # rolls backTraceback (most recent call last):  ...Exception

.. testcleanup:: txn

with client.batch() as batch:    batch.delete(client.key('EntityKind', 1234))    batch.delete(client.key('EntityKind', 2345))

Getter for database in which the batch will run.

Getter for the changes accumulated by this batch.

Every batch is committed with a single commit request containing allthe work to be done as mutations. Inside a batch, callingputwith an entity, ordelete with a key, builds up the request byadding a new mutation. This getter returns the protobuf that has beenbuilt-up so far.

Getter for namespace in which the batch will run.

Getter for project in which the batch will run.

Begins a batch.

This method is called automatically when entering a withstatement, however it can be called explicitly if you don't wantto use a context manager.

Overridden by xref_Transaction.

Commits the batch.

This is called automatically upon exiting a with statement,however it can be called explicitly if you don't want to use acontext manager.

Return the topmost batch / transaction, or None.

Remember a key to be deleted duringcommit.

Remember an entity's state to be saved duringcommit.

Rolls back the current batch.

Marks the batch as aborted (can't be used again).

Overridden by xref_Transaction.