CleanupPreviewLinkTask.php

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<?php
namespace TYPO3\CMS\Workspaces\Task;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class CleanupPreviewLinkTask extends \TYPO3\CMS\Scheduler\Task\AbstractTask
{
    public function execute()
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('sys_preview');
        $queryBuilder
            ->delete('sys_preview')
            ->where(
                $queryBuilder->expr()->lt(
                    'endtime',
                    $queryBuilder->createNamedParameter($GLOBALS['EXEC_TIME'], \PDO::PARAM_INT)
                )
            )
            ->execute();

        return true;
    }
}