Cloud Datastore Client - Class AggregationQuery (1.29.1)

Version 1.29.1

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Reference documentation and code samples for the Cloud Datastore Client class AggregationQuery.

Represents an Aggregation Query.

Example:

use Google\Cloud\Datastore\DatastoreClient;
use Google\Cloud\Datastore\Query\Aggregation;

$datastore = new DatastoreClient();

$query = $datastore->query();
$query->kind('Companies');
$query->filter('companyName', '=', 'Google');
$aggregationQuery = $query->aggregation(Aggregation::count()->alias('total'));

$res = $datastore->runAggregationQuery($aggregationQuery);
echo $res->get('total');

Example (aggregated using over method):

use Google\Cloud\Datastore\DatastoreClient;
use Google\Cloud\Datastore\Query\Aggregation;

$datastore = new DatastoreClient();

$query = $datastore->query();
$query->kind('Companies');
$query->filter('companyName', '=', 'Google');
$query->limit(100);
$aggregationQuery = $datastore->aggregationQuery();
$aggregationQuery->over($query)->addAggregation(Aggregation::count()->alias('total_upto_100'));

$res = $datastore->runAggregationQuery($aggregationQuery);
echo $res->get('total_upto_100');

Namespace

Google \ Cloud \ Datastore \ Query

Methods

__construct

Create an aggregation query.

Parameters
Name	Description
query	Google\Cloud\Datastore\Query\QueryInterface|null
aggregates	mixed

addAggregation

Adds a Query Aggregation.

Accepts an array of properties for aggregation.

Example:

$query = $datastore->AggregationQuery();
$query->kind('Companies');
$query->filter('companyName', '=', 'Google');
$query->addAggregation(Aggregation::count()->alias('total'));
echo json_encode($query->queryObject());

Parameter
Name	Description
aggregation	Google\Cloud\Datastore\Query\Aggregation The Aggregation to be included.

Returns
Type	Description
Google\Cloud\Datastore\Query\AggregationQuery

over

Set the Query Projection.

Accepts an array of properties. If set, only these properties will be returned.

Example:

$query = $datastore->query();
$query->kind('Companies');
$query->filter('companyName', '=', 'Google');

$pipeline = $datastore->AggregationQuery()
    ->over($query)
    ->addAggregation(Aggregation::count()->alias('total'));

Parameter
Name	Description
query	Google\Cloud\Datastore\Query\QueryInterface The query whose properties to include.

Returns
Type	Description
Google\Cloud\Datastore\Query\AggregationQuery

queryObject

Format the query for use in the API.

Returns
Type	Description
array