Module aggregation (2.16.1)

API documentation for datastore.aggregation module.

Classes

AggregationQuery

AggregationQuery(client, query)

An Aggregation query against the Cloud Datastore.

This class serves as an abstraction for creating aggregations over query in the Cloud Datastore.

Parameters
Name	Description
`client`	`Client` The client used to connect to Datastore.
`query`	`Query` The query used for aggregations.

AggregationResult

AggregationResult(alias, value)

A class representing result from Aggregation Query

Parameters
Name	Description
`alias`	`str` The alias for the aggregation.
`value`	`int` The resulting value from the aggregation.

AggregationResultIterator

AggregationResultIterator(
    aggregation_query,
    client,
    limit=None,
    eventual=False,
    retry=None,
    timeout=None,
    read_time=None,
)

Represent the state of a given execution of a Query.

Parameters
Name	Description
`aggregation_query`	`AggregationQuery` AggregationQuery object holding permanent configuration (i.e. things that don't change on with each page in a results set).
`client`	`Client` The client used to make a request.
`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, otherwise 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) Runs the query with read time consistency. Cannot be used with eventual consistency or inside a transaction, otherwise will raise ValueError. This feature is in private preview.

BaseAggregation

BaseAggregation()

Base class representing an Aggregation operation in Datastore

CountAggregation

CountAggregation(alias=None)

Representation of a "Count" aggregation query.

Parameters
Name	Description
`alias`	`str` The alias for the aggregation.
`value`	`int` The resulting value from the aggregation.