<?php
/**
 * webtrees: online genealogy
 * Copyright (C) 2018 webtrees development team
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
declare(strict_types=1);

namespace Fisharebest\Webtrees\Schema;

use Fisharebest\Webtrees\Database;

/**
 * Upgrade the database schema from version 19 to version 20.
 */
class Migration19 implements MigrationInterface
{
    /**
     * Upgrade to to the next version
     *
     * @return void
     */
    public function upgrade()
    {
        // Fix some broken data caused by a bug
        Database::exec("UPDATE `##default_resn` SET xref     = NULL WHERE xref     = ''");
        Database::exec("UPDATE `##default_resn` SET tag_type = NULL WHERE tag_type = ''");
    }
}
