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

Python client library | Google Cloud

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, database=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.
- database (str) – (Optional) database to pass to proxied API methods.

SCOPE(: Union[Tuple[str, ...], None = ('https://www.googleapis.com/auth/datastore', )

The scopes required for authenticating as a Cloud Datastore consumer.

aggregation_query(query, **kwargs)

Proxy to google.cloud.datastore.aggregation.AggregationQuery.

Using aggregation_query to count over a query:

>>> query = client.query(kind='MyKind')
>>> aggregation_query = client.aggregation_query(query)
>>> aggregation_query.count(alias='total')
<google.cloud.datastore.aggregation.AggregationQuery object at ...>
>>> aggregation_query.fetch()
<google.cloud.datastore.aggregation.AggregationResultIterator object at ...>

Adding an aggregation to the aggregation_query

>>> query = client.query(kind='MyKind')
>>> aggregation_query.add_aggregation(CountAggregation(alias='total'))
>>> aggregation_query.fetch()
<google.cloud.datastore.aggregation.AggregationResultIterator object at ...>

Adding multiple aggregations to the aggregation_query

>>> query = client.query(kind='MyKind')
>>> total_count = CountAggregation(alias='total')
>>> all_count = CountAggregation(alias='all')
>>> aggregation_query.add_aggregations([total_count, all_count])
>>> aggregation_query.fetch()
<google.cloud.datastore.aggregation.AggregationResultIterator object at ...>

Using the aggregation_query iterator

>>> query = client.query(kind='MyKind')
>>> aggregation_query = client.aggregation_query(query)
>>> aggregation_query.count(alias='total')
<google.cloud.datastore.aggregation.AggregationQuery object at ...>
>>> aggregation_query_iter = aggregation_query.fetch()
>>> for aggregation_result in aggregation_query_iter:
...     do_something_with(aggregation_result)

or manually page through results

>>> aggregation_query_iter = aggregation_query.fetch()
>>> pages = aggregation_query_iter.pages
>>>
>>> first_page = next(pages)
>>> first_page_entities = list(first_page)
>>> aggregation_query_iter.next_page_token is None
True

Parameters

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

AggregationQuery
Returns

An AggregationQuery object.

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

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.
- 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.
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.

property database()

Getter for database

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
- key (google.cloud.datastore.key.Key, google.cloud.datastore.entity.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(keys, retry=None, timeout=None)

Delete keys from the Cloud Datastore.

Parameters
- keys (list of google.cloud.datastore.key.Key, google.cloud.datastore.entity.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(key=None, exclude_from_indexes=())

Proxy to google.cloud.datastore.entity.Entity.

get(key, missing=None, deferred=None, transaction=None, eventual=False, retry=None, timeout=None, read_time=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
- 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 with read_time, 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.
- read_time (datetime) – Read the entity from the specified time (may be null). Cannot be used with eventual consistency or inside a transaction, or will raise ValueError. This feature is in private preview.
Return type

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

The requested entity if it exists.
Raises

ValueError if more than one of eventual==True, transaction, and read_time is specified.

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

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.
- 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.
- read_time (datetime) – (Optional) Read time to use for read consistency. This feature is in private preview.
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; or if more than one of eventual==True, transaction, and read_time is specified.

key(*path_args, **kwargs)

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

Passes our project and our database.

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
- entity (google.cloud.datastore.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(entities, retry=None, timeout=None)

Save entities in the Cloud Datastore.

Parameters
- entities (list of google.cloud.datastore.entity.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.
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')
<google.cloud.datastore.query.Query object at ...>

Using the query iterator

>>> 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

>>> 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

Parameters

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

Query
Returns

A query object.

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(complete_keys, retry=None, timeout=None)

Reserve IDs from a list of complete keys.

Parameters
- complete_keys (list of google.cloud.datastore.key.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.
Return type

class:NoneType
Returns

None
Raises

ValueError if any of complete_keys` is not a Complete key.

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
- complete_key (google.cloud.datastore.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.
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.

google.cloud.datastore.client.DATASTORE_DATASET( = 'DATASTORE_DATASET )

Environment variable defining default dataset ID under GCD.

google.cloud.datastore.client.DATASTORE_EMULATOR_HOST( = 'DATASTORE_EMULATOR_HOST )

Environment variable defining host for datastore emulator server.

google.cloud.datastore.client.DISABLE_GRPC( = 'GOOGLE_CLOUD_DISABLE_GRPC )

Environment variable acting as flag to disable gRPC.

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