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<?php
/**
* Copyright 2016 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_read_stale_data]
use Google\Cloud\Spanner\Duration;
use Google\Cloud\Spanner\SpannerClient;
/**
* Reads sample data from the database. The data is exactly 15 seconds stale.
* Guarantees that all writes committed more than 15 seconds ago are visible.
* Example:
* ```
* read_stale_data
*($instanceId, $databaseId);
* ```
*
* @param string $instanceId The Spanner instance ID.
* @param string $databaseId The Spanner database ID.
*/
function read_stale_data($instanceId, $databaseId)
{
$spanner = new SpannerClient();
$instance = $spanner->instance($instanceId);
$database = $instance->database($databaseId);
$keySet = $spanner->keySet(['all' => true]);
$results = $database->read(
'Albums',
$keySet,
['SingerId', 'AlbumId', 'AlbumTitle'],
['exactStaleness' => new Duration(15)]
);
foreach ($results->rows() as $row) {
printf('SingerId: %s, AlbumId: %s, AlbumTitle: %s' . PHP_EOL,
$row['SingerId'], $row['AlbumId'], $row['AlbumTitle']);
}
}
// [END spanner_read_stale_data]
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