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pg_interleaved_table.php
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pg_interleaved_table.php
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<?php
/**
* Copyright 2022 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/main/spanner/README.md
*/
namespace Google\Cloud\Samples\Spanner;
// [START spanner_postgresql_interleaved_table]
use Google\Cloud\Spanner\SpannerClient;
/**
* Create an interleaved table on a Spanner PostgreSQL database.
*
* @param string $instanceId The Spanner instance ID.
* @param string $databaseId The Spanner database ID.
* @param string $parentTable The parent table to create. Defaults to 'Singers'
* @param string $childTable The child table to create. Defaults to 'Albums'
*/
function pg_interleaved_table(string $instanceId, string $databaseId, string $parentTable = 'Singers', string $childTable = 'Albums'): void
{
$spanner = new SpannerClient();
$instance = $spanner->instance($instanceId);
$database = $instance->database($databaseId);
// The Spanner PostgreSQL dialect extends the PostgreSQL dialect with certain Spanner
// specific features, such as interleaved tables.
// See https://cloud.google.com/spanner/docs/postgresql/data-definition-language#create_table
// for the full CREATE TABLE syntax.
$parentTableQuery = sprintf('CREATE TABLE %s (
SingerId bigint NOT NULL PRIMARY KEY,
FirstName varchar(1024) NOT NULL,
LastName varchar(1024) NOT NULL
)', $parentTable);
$childTableQuery = sprintf('CREATE TABLE %s (
SingerId bigint NOT NULL,
AlbumId bigint NOT NULL,
Title varchar(1024) NOT NULL,
PRIMARY KEY (SingerId, AlbumId)
) INTERLEAVE IN PARENT %s ON DELETE CASCADE', $childTable, $parentTable);
$operation = $database->updateDdlBatch([$parentTableQuery, $childTableQuery]);
print('Waiting for operation to complete...' . PHP_EOL);
$operation->pollUntilComplete();
printf('Created interleaved table hierarchy using PostgreSQL dialect' . PHP_EOL);
}
// [END spanner_postgresql_interleaved_table]
// The following 2 lines are only needed to run the samples
require_once __DIR__ . '/../../testing/sample_helpers.php';
\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);