AbstractDatabaseRecordProvider.php

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<?php
namespace TYPO3\CMS\Backend\Form\FormDataProvider;

/*
 * 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\DatabaseConnection;
use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Backend\Form\Exception\DatabaseRecordException;

abstract class AbstractDatabaseRecordProvider
{
    protected function getRecordFromDatabase($tableName, $uid)
    {
        if ($uid <= 0) {
            throw new \InvalidArgumentException(
                '$uid must be positive integer, ' . $uid . ' given',
                1437656456
            );
        }
        $database = $this->getDatabase();
        $tableName = $database->quoteStr($tableName, $tableName);
        $where = 'uid=' . (int)$uid . BackendUtility::deleteClause($tableName);
        $row = $database->exec_SELECTgetSingleRow('*', $tableName, $where);
        if ($row === null) {
            // Indicates a program / usage error
            throw new \RuntimeException(
                'Database error fetching record from tablename ' . $tableName . ' with uid ' . $uid,
                1437655862
            );
        }
        if ($row === false) {
            // Indicates a runtime error (eg. record was killed by other editor meanwhile) can be caught elsewhere
            // and transformed to a message to the user or something
            throw new DatabaseRecordException(
                'Record with uid ' . $uid . ' from table ' . $tableName . ' not found',
                1437656081
            );
        }
        if (!is_array($row)) {
            // Database connection behaves weird ...
            throw new \UnexpectedValueException(
                'Database exec_SELECTgetSingleRow() did not return error type or result',
                1437656323
            );
        }
        return $row;
    }

    protected function getDatabase()
    {
        return $GLOBALS['TYPO3_DB'];
    }
}