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<?php |
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/** |
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* @author Sujith Haridasan <[email protected]> |
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* |
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* @copyright Copyright (c) 2018, ownCloud GmbH |
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* @license AGPL-3.0 |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OC\Repair; |
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use OCP\DB\QueryBuilder\IQueryBuilder; |
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use OCP\IDBConnection; |
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use OCP\Migration\IOutput; |
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use OCP\Migration\IRepairStep; |
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class RepairOrphanedSubshare implements IRepairStep { |
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/** @var IDBConnection */ |
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private $connection; |
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/** |
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* RepairOrphanedSubshare constructor. |
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* |
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* @param IDBConnection $connection |
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*/ |
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public function __construct(IDBConnection $connection) { |
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$this->connection = $connection; |
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} |
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/** |
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* Returns the step's name |
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* |
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* @return string |
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*/ |
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public function getName() { |
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return 'Repair orphaned reshare'; |
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} |
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/** |
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* Run repair step. |
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* Must throw exception on error. |
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* |
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* @param IOutput $output |
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* @throws \Exception in case of failure |
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*/ |
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public function run(IOutput $output) { |
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/** |
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DELETE FROM share |
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WHERE parent NOT IN ( |
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SELECT id FROM ( |
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SELECT id FROM share |
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ORDER BY id -- to prevent derived table merge |
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) mysqlerr1093hack |
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) |
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*/ |
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// subselect for all share ids |
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$allShares = $this->connection->getQueryBuilder() |
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->select('id') |
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->from('share') |
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->orderBy('id'); // to prevent derived table merge, see https://mariadb.com/kb/en/library/derived-table-merge-optimization/#factsheet |
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// TODO this subquery currently cannot be built with our doctrine wrapper |
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// TODO make the mysql hack optional? might also be needed for oracle |
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$subquery = "SELECT `id` FROM ({$allShares->getSQL()}) mysqlerr1093hack"; |
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//This delete query deletes orphan shares whose parents are missing |
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$deleteOrphanReshares = $this->connection->getQueryBuilder(); |
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$deleteOrphanReshares |
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->delete('share') |
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->where($deleteOrphanReshares->expr()->notIn('parent', |
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$deleteOrphanReshares->createFunction($subquery))); |
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$deleteOrphanReshares->execute(); |
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} |
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} |
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owncloud /
core
