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<?php

/**

* Copyright 2018 Google Inc.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

/**

* For instructions on how to run the full sample:

*

* @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/spanner/README.md

*/

namespace Google\Cloud\Samples\Spanner;

// [START spanner_batch_client]

use Google\Cloud\Spanner\SpannerClient;

/**

* Queries sample data from the database using SQL.

* Example:

* ```

* batch_query_data($instanceId, $databaseId);

* ```

*

* @param string $instanceId The Spanner instance ID.

* @param string $databaseId The Spanner database ID.

*/

function batch_query_data($instanceId, $databaseId)

{

$spanner = new SpannerClient();

$batch = $spanner->batch($instanceId, $databaseId);

$snapshot = $batch->snapshot();

$queryString = 'SELECT SingerId, FirstName, LastName FROM Singers';

$partitions = $snapshot->partitionQuery($queryString);

$totalPartitions = count($partitions);

$totalRecords = 0;

foreach ($partitions as $partition) {

$result = $snapshot->executePartition($partition);

$rows = $result->rows();

foreach ($rows as $row) {

$singerId = $row['SingerId'];

$firstName = $row['FirstName'];

$lastName = $row['LastName'];

printf('SingerId: %s, FirstName: %s, LastName: %s' . PHP_EOL, $singerId, $firstName, $lastName);

$totalRecords++;

}

}

printf('Total Partitions: %d' . PHP_EOL, $totalPartitions);

printf('Total Records: %d' . PHP_EOL, $totalRecords);

$averageRecordsPerPartition = $totalRecords / $totalPartitions;

printf('Average Records Per Partition: %f' . PHP_EOL, $averageRecordsPerPartition);

}

// [END spanner_batch_client]