70 lines
1.9 KiB
PHP
70 lines
1.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2017, ownCloud GmbH
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*
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* @author Joas Schilling <coding@schilljs.com>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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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\DB;
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use OCP\IDBConnection;
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/**
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* Various MySQL specific helper functions.
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*/
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class MySqlTools {
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/**
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* @param Connection $connection
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* @return bool
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*/
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public function supports4ByteCharset(IDBConnection $connection) {
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$variables = ['innodb_file_per_table' => 'ON'];
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if (!$this->isMariaDBWithLargePrefix($connection)) {
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$variables['innodb_file_format'] = 'Barracuda';
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$variables['innodb_large_prefix'] = 'ON';
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}
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foreach ($variables as $var => $val) {
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$result = $connection->executeQuery("SHOW VARIABLES LIKE '$var'");
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$row = $result->fetch();
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$result->closeCursor();
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if ($row === false) {
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return false;
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}
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if (strcasecmp($row['Value'], $val) !== 0) {
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return false;
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}
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}
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return true;
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}
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protected function isMariaDBWithLargePrefix(IDBConnection $connection) {
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$result = $connection->executeQuery('SELECT VERSION()');
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$row = strtolower($result->fetchColumn());
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$result->closeCursor();
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if ($row === false) {
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return false;
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}
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return strpos($row, 'maria') && version_compare($row, '10.3', '>=') ||
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strpos($row, 'maria') === false && version_compare($row, '8.0', '>=');
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}
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}
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