nextcloud-server/lib/private/DB/AdapterMySQL.php

<?php

/**
 * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-only
 */
namespace OC\DB;

class AdapterMySQL extends Adapter {
	/** @var string */
	protected $collation;

	/**
	 * @param string $tableName
	 */
	public function lockTable($tableName) {
		$this->conn->executeUpdate('LOCK TABLES `' .$tableName . '` WRITE');
	}

	public function unlockTable() {
		$this->conn->executeUpdate('UNLOCK TABLES');
	}

	public function fixupStatement($statement) {
		$statement = str_replace(' ILIKE ', ' COLLATE ' . $this->getCollation() . ' LIKE ', $statement);
		return $statement;
	}

	protected function getCollation(): string {
		if (!$this->collation) {
			$params = $this->conn->getParams();
			$this->collation = $params['collation'] ?? (($params['charset'] ?? 'utf8') . '_general_ci');
		}

		return $this->collation;
	}
}