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Showing content from https://cloud.google.com/python/docs/reference/datastore/1.10.0/client below:

Python client library | Google Cloud

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Datastore Client

Convenience wrapper for invoking APIs/factories w/ a project.

class google.cloud.datastore.client.Client(project=None, namespace=None, credentials=None, client_info=<google.api_core.gapic_v1.client_info.ClientInfo object>, client_options=None, _http=None, _use_grpc=None)

Bases: google.cloud.client.ClientWithProject

Convenience wrapper for invoking APIs/factories w/ a project.

>>> from google.cloud import datastore
>>> client = datastore.Client()

Parameters
- project (str) – (Optional) The project to pass to proxied API methods.
- namespace (str) – (Optional) namespace to pass to proxied API methods.
- credentials (Credentials) – (Optional) The OAuth2 Credentials to use for this client. If not passed (and if no _http object is passed), falls back to the default inferred from the environment.
- client_info (google.api_core.gapic_v1.client_info.ClientInfo or google.api_core.client_info.ClientInfo) – (Optional) The client info used to send a user-agent string along with API requests. If None, then default info will be used. Generally, you only need to set this if you’re developing your own library or partner tool.
- client_options (ClientOptions or dict) – (Optional) Client options used to set user options on the client. API Endpoint should be set through client_options.
- _http (Session) – (Optional) HTTP object to make requests. Can be any object that defines request() with the same interface as requests.Session.request(). If not passed, an _http object is created that is bound to the credentials for the current object. This parameter should be considered private, and could change in the future.
- _use_grpc (bool) – (Optional) Explicitly specifies whether to use the gRPC transport (via GAX) or HTTP. If unset, falls back to the GOOGLE_CLOUD_DISABLE_GRPC environment variable. This parameter should be considered private, and could change in the future.

SCOPE(: Optional[Tuple[str, ...] = ('https://www.googleapis.com/auth/datastore', )

The scopes required for authenticating as a Cloud Datastore consumer.

allocate_ids(incomplete_key, num_ids)

Allocate a list of IDs from a partial key.

Parameters
- incomplete_key (google.cloud.datastore.key.Key) – Partial key to use as base for allocated IDs.
- num_ids (int) – The number of IDs to allocate.
Return type

list of google.cloud.datastore.key.Key
Returns

The (complete) keys allocated with incomplete_key as root.
Raises

ValueError if incomplete_key is not a partial key.

property base_url()

Getter for API base URL.

batch()

Proxy to google.cloud.datastore.batch.Batch.

property current_batch()

Currently-active batch.

Return type

google.cloud.datastore.batch.Batch, or an object implementing its API, or NoneType (if no batch is active).
Returns

The batch/transaction at the top of the batch stack.

property current_transaction()

Currently-active transaction.

Return type

google.cloud.datastore.transaction.Transaction, or an object implementing its API, or NoneType (if no transaction is active).
Returns

The transaction at the top of the batch stack.

delete(key)

Delete the key in the Cloud Datastore.

NOTE: This is just a thin wrapper over delete_multi(). The backend API does not make a distinction between a single key or multiple keys in a commit request.

Parameters

key (google.cloud.datastore.key.Key) – The key to be deleted from the datastore.

delete_multi(keys)

Delete keys from the Cloud Datastore.

Parameters

keys (list of google.cloud.datastore.key.Key) – The keys to be deleted from the Datastore.

get(key, missing=None, deferred=None, transaction=None, eventual=False)

Retrieve an entity from a single key (if it exists).

NOTE: This is just a thin wrapper over get_multi(). The backend API does not make a distinction between a single key or multiple keys in a lookup request.

Parameters
- key (google.cloud.datastore.key.Key) – The key to be retrieved from the datastore.
- missing (list) – (Optional) If a list is passed, the key-only entities returned by the backend as “missing” will be copied into it.
- deferred (list) – (Optional) If a list is passed, the keys returned by the backend as “deferred” will be copied into it.
- transaction (Transaction) – (Optional) Transaction to use for read consistency. If not passed, uses current transaction, if set.
- eventual (bool) – (Optional) Defaults to strongly consistent (False). Setting True will use eventual consistency, but cannot be used inside a transaction or will raise ValueError.
Return type

google.cloud.datastore.entity.Entity or NoneType
Returns

The requested entity if it exists.
Raises

ValueError if eventual is True and in a transaction.

get_multi(keys, missing=None, deferred=None, transaction=None, eventual=False)

Retrieve entities, along with their attributes.

Parameters
- keys (list of google.cloud.datastore.key.Key) – The keys to be retrieved from the datastore.
- missing (list) – (Optional) If a list is passed, the key-only entities returned by the backend as “missing” will be copied into it. If the list is not empty, an error will occur.
- deferred (list) – (Optional) If a list is passed, the keys returned by the backend as “deferred” will be copied into it. If the list is not empty, an error will occur.
- transaction (Transaction) – (Optional) Transaction to use for read consistency. If not passed, uses current transaction, if set.
- eventual (bool) – (Optional) Defaults to strongly consistent (False). Setting True will use eventual consistency, but cannot be used inside a transaction or will raise ValueError.
Return type

list of google.cloud.datastore.entity.Entity
Returns

The requested entities.
Raises

ValueError if one or more of keys has a project which does not match our project.
Raises

ValueError if eventual is True and in a transaction.

key(*path_args, **kwargs)

Proxy to google.cloud.datastore.key.Key.

Passes our project.

put(entity)

Save an entity in the Cloud Datastore.

NOTE: This is just a thin wrapper over put_multi(). The backend API does not make a distinction between a single entity or multiple entities in a commit request.

Parameters

entity (google.cloud.datastore.entity.Entity) – The entity to be saved to the datastore.

put_multi(entities)

Save entities in the Cloud Datastore.

Parameters

entities (list of google.cloud.datastore.entity.Entity) – The entities to be saved to the datastore.
Raises

ValueError if entities is a single entity.

query(**kwargs)

Proxy to google.cloud.datastore.query.Query.

Passes our project.

Using query to search a datastore:

>>> query = client.query(kind='MyKind')
>>> query.add_filter('property', '=', 'val')

Using the query iterator

>>> query_iter = query.fetch()
>>> for entity in query_iter:
...     do_something(entity)

or manually page through results

>>> query_iter = query.fetch(start_cursor=cursor)
>>> pages = query_iter.pages
>>>
>>> first_page = next(pages)
>>> first_page_entities = list(first_page)
>>> query_iter.next_page_token is None
True

Parameters

kwargs – Parameters for initializing and instance of Query.
Return type

Query
Returns

A query object.

reserve_ids(complete_key, num_ids)

Reserve a list of IDs from a complete key.

Parameters
- complete_key (google.cloud.datastore.key.Key) – Partial key to use as base for reserved IDs.
- num_ids (int) – The number of IDs to reserve.
Return type

class:NoneType
Returns

None
Raises

ValueError if complete_key` is not a Complete key.

transaction(**kwargs)

Proxy to google.cloud.datastore.transaction.Transaction.

Parameters

kwargs – Keyword arguments to be passed in.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

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