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<?php
/**
* SPDX-FileCopyrightText: 2017 ownCloud GmbH
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\DB;
use OCP\IDBConnection;
/**
* Various MySQL specific helper functions.
*/
class MySqlTools {
/**
* @param IDBConnection $connection
* @return bool
*/
public function supports4ByteCharset(IDBConnection $connection) {
$variables = ['innodb_file_per_table' => 'ON'];
if (!$this->isMariaDBWithLargePrefix($connection)) {
$variables['innodb_file_format'] = 'Barracuda';
$variables['innodb_large_prefix'] = 'ON';
}
foreach ($variables as $var => $val) {
$result = $connection->executeQuery("SHOW VARIABLES LIKE '$var'");
$row = $result->fetch();
$result->closeCursor();
if ($row === false) {
return false;
}
if (strcasecmp($row['Value'], $val) !== 0) {
return false;
}
}
return true;
}
protected function isMariaDBWithLargePrefix(IDBConnection $connection) {
$result = $connection->executeQuery('SELECT VERSION()');
$row = strtolower($result->fetchColumn());
$result->closeCursor();
if ($row === false) {
return false;
}
return str_contains($row, 'maria') && version_compare($row, '10.3', '>=') ||
!str_contains($row, 'maria') && version_compare($row, '8.0', '>=');
}
}
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