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<?php
/**
* @copyright Copyright (c) 2017 René Gieling <github@dartcafe.de>
*
* @author René Gieling <github@dartcafe.de>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Polls\Migration;
use OCP\DB\ISchemaWrapper;
use OCP\IConfig;
use OCP\IDBConnection;
use OCP\Migration\SimpleMigrationStep;
use OCP\Migration\IOutput;
/**
* Installation class for the polls app.
* Initial db creation
*/
class Version0104Date20200205104800 extends SimpleMigrationStep {
/** @var IDBConnection */
protected $connection;
/** @var IConfig */
protected $config;
/** @var array */
protected $childTables = [
'polls_comments',
'polls_log',
'polls_notif',
'polls_options',
'polls_share',
'polls_votes',
];
/**
* @param IDBConnection $connection
* @param IConfig $config
*/
public function __construct(IDBConnection $connection, IConfig $config) {
$this->connection = $connection;
$this->config = $config;
}
/**
* @param IOutput $output
* @param \Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
* @param array $options
* @return null
* @since 13.0.0
*/
public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options) {
// delete all orphaned entries by selecting all rows
// those poll_ids are not present in the polls table
//
// we have to use a raw query, because NOT EXISTS is not
// part of doctrine's expression builder
//
// get table prefix, as we are running a raw query
$prefix = $this->config->getSystemValue('dbtableprefix', 'oc_');
// check for orphaned entries in all tables referencing
// the main polls table
foreach ($this->childTables as $tbl) {
$child = "$prefix$tbl";
$query = "DELETE
FROM $child
WHERE NOT EXISTS (
SELECT NULL
FROM {$prefix}polls_polls polls
WHERE polls.id = {$child}.poll_id
)";
$stmt = $this->connection->prepare($query);
$stmt->execute();
}
}
/**
* @param IOutput $output
* @param \Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
* @param array $options
* @return null|ISchemaWrapper
* @since 13.0.0
*/
public function changeSchema(IOutput $output, \Closure $schemaClosure, array $options) {
// add an on delete fk contraint to all tables referencing the main polls table
/** @var ISchemaWrapper $schema */
$schema = $schemaClosure();
$eventTable = $schema->getTable('polls_polls');
foreach ($this->childTables as $tbl) {
$table = $schema->getTable($tbl);
$table->addForeignKeyConstraint($eventTable, ['poll_id'], ['id'], ['onDelete' => 'CASCADE']);
}
return $schema;
}
}
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