Class Client (2.3.0)

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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)

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

.. doctest::

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

Parameters

NameDescription
project str

(Optional) The project to pass to proxied API methods.

namespace str

(Optional) namespace to pass to proxied API methods.

credentials `google.auth.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 `google.api_core.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 `requests.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.

Inheritance

builtins.object > google.cloud.client._ClientFactoryMixin > google.cloud.client.Client > builtins.object > google.cloud.client._ClientProjectMixin > google.cloud.client.ClientWithProject > Client

Properties

base_url

Getter for API base URL.

current_batch

Currently-active batch.

Returns
TypeDescription
Batch, or an object implementing its API, or ``NoneType`` (if no batch is active).The batch/transaction at the top of the batch stack.

current_transaction

Currently-active transaction.

Returns
TypeDescription
Transaction, or an object implementing its API, or ``NoneType`` (if no transaction is active).The transaction at the top of the batch stack.

Methods

allocate_ids

allocate_ids(incomplete_key, num_ids, retry=None, timeout=None)

Allocate a list of IDs from a partial key.

Parameters
NameDescription
incomplete_key Key

Partial key to use as base for allocated IDs.

num_ids int

The number of IDs to allocate.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt.

Exceptions
TypeDescription
`ValueErrorif ``incomplete_key`` is not a partial key.
Returns
TypeDescription
list of KeyThe (complete) keys allocated with ``incomplete_key`` as root.

batch

batch()

Proxy to Batch.

delete

delete(key, retry=None, timeout=None)

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
NameDescription
key Key, Entity

The key to be deleted from the datastore.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration. Only meaningful outside of another batch / transaction.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt. Only meaningful outside of another batch / transaction.

delete_multi

delete_multi(keys, retry=None, timeout=None)

Delete keys from the Cloud Datastore.

Parameters
NameDescription
keys list of Key, Entity

The keys to be deleted from the Datastore.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration. Only meaningful outside of another batch / transaction.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt. Only meaningful outside of another batch / transaction.

entity

entity(key=None, exclude_from_indexes=())

Proxy to Entity.

get

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

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
NameDescription
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.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt.

Exceptions
TypeDescription
`ValueErrorif eventual is True and in a transaction.
Returns
TypeDescription
Entity or ``NoneType``The requested entity if it exists.

get_multi

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

Retrieve entities, along with their attributes.

Parameters
NameDescription
keys list of 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.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt.

Exceptions
TypeDescription
`ValueErrorif one or more of ``keys`` has a project which does not match our project.
`ValueErrorif eventual is True and in a transaction.
Returns
TypeDescription
list of EntityThe requested entities.

key

key(*path_args, **kwargs)

Proxy to Key.

Passes our project.

put

put(entity, retry=None, timeout=None)

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
NameDescription
entity Entity

The entity to be saved to the datastore.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration. Only meaningful outside of another batch / transaction.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt. Only meaningful outside of another batch / transaction.

put_multi

put_multi(entities, retry=None, timeout=None)

Save entities in the Cloud Datastore.

Parameters
NameDescription
entities list of Entity

The entities to be saved to the datastore.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration. Only meaningful outside of another batch / transaction.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt. Only meaningful outside of another batch / transaction.

Exceptions
TypeDescription
`ValueErrorif ``entities`` is a single entity.

query

query(**kwargs)

Proxy to xref_Query.

Passes our project.

Using query to search a datastore:

.. testsetup:: query

import uuid

from google.cloud import datastore

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

def do_something_with(entity):
    pass

.. doctest:: query

>>> query = client.query(kind='MyKind')
>>> query.add_filter('property', '=', 'val')
<<xref uid="google.cloud.datastore.query.Query">google.cloud.datastore.query.Query</xref> object at ...>

Using the query iterator

.. doctest:: query

>>> filters = [('property', '=', 'val')]
>>> query = client.query(kind='MyKind', filters=filters)
>>> query_iter = query.fetch()
>>> for entity in query_iter:
...     do_something_with(entity)

or manually page through results

.. doctest:: query

>>> query_iter = query.fetch()
>>> pages = query_iter.pages
>>>
>>> first_page = next(pages)
>>> first_page_entities = list(first_page)
>>> query_iter.next_page_token is None
True
Returns
TypeDescription
QueryA query object.

reserve_ids

reserve_ids(complete_key, num_ids, retry=None, timeout=None)

Reserve a list of IDs sequentially from a complete key.

DEPRECATED. Alias for reserve_ids_sequential.

Please use either reserve_ids_multi (recommended) or reserve_ids_sequential.

reserve_ids_multi

reserve_ids_multi(complete_keys, retry=None, timeout=None)

Reserve IDs from a list of complete keys.

Parameters
NameDescription
complete_keys `list` of Key

Complete keys for which to reserve IDs.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt.

Exceptions
TypeDescription
`ValueErrorif any of `complete_keys`` is not a Complete key.
Returns
TypeDescription
class:`NoneType`None

reserve_ids_sequential

reserve_ids_sequential(complete_key, num_ids, retry=None, timeout=None)

Reserve a list of IDs sequentially from a complete key.

This will reserve the key passed as complete_key as well as additional keys derived by incrementing the last ID in the path of complete_key sequentially to obtain the number of keys specified in num_ids.

Parameters
NameDescription
complete_key Key

Complete key to use as base for reserved IDs. Key must use a numeric ID and not a string name.

num_ids int

The number of IDs to reserve.

retry `google.api_core.retry.Retry`

A retry object used to retry requests. If None is specified, requests will be retried using a default configuration.

timeout float

Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt.

Exceptions
TypeDescription
`ValueErrorif `complete_key`` is not a Complete key.
Returns
TypeDescription
class:`NoneType`None

transaction

transaction(**kwargs)

Proxy to xref_Transaction.