Zabbix

<?php

/*

** Zabbix

** Copyright (C) 2001-2022 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

/**

 * Database backend class for MySQL.

 */

class MysqlDbBackend extends DbBackend {

​

    /**

     * Check if 'dbversion' table exists.

     *

     * @return bool

     */

    protected function checkDbVersionTable() {

        $table_exists = DBfetch(DBselect("SHOW TABLES LIKE 'dbversion'"));

​

        if (!$table_exists) {

            $this->setError(_s('Unable to determine current Zabbix database version: %1$s.',

                _s('the table "%1$s" was not found', 'dbversion')

            ));

​

            return false;

        }

​

        return true;

    }

​

    /**

     * Check database and table fields encoding.

     *

     * @return bool

     */

    public function checkEncoding() {

        global $DB;

​

        return $this->checkDatabaseEncoding($DB) && $this->checkTablesEncoding($DB);

    }

​

    /**

     * Check database schema encoding. On error will set warning message.

     *

     * @param array $DB  Array of database settings, same as global $DB.

     *

     * @return bool

     */

    protected function checkDatabaseEncoding(array $DB) {