DatabaseWriter.php

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<?php
namespace TYPO3\CMS\Core\Log\Writer;

use TYPO3\CMS\Core\Log\LogRecord;

class DatabaseWriter extends \TYPO3\CMS\Core\Log\Writer\AbstractWriter {

    protected $logTable = 'sys_log';

    public function setLogTable($tableName) {
        $this->logTable = $tableName;
        return $this;
    }

    public function getLogTable() {
        return $this->logTable;
    }

    public function writeLog(LogRecord $record) {
        $data = '';
        $recordData = $record->getData();
        if (!empty($recordData)) {
            // According to PSR3 the exception-key may hold an \Exception
            // Since json_encode() does not encode an exception, we run the _toString() here
            if (isset($recordData['exception']) && $recordData['exception'] instanceof \Exception) {
                $recordData['exception'] = (string)$recordData['exception'];
            }
            $data = '- ' . json_encode($recordData);
        }

        $fieldValues = array(
            'request_id' => $record->getRequestId(),
            'time_micro' => $record->getCreated(),
            'component' => $record->getComponent(),
            'level' => $record->getLevel(),
            'message' => $record->getMessage(),
            'data' => $data
        );

        if (FALSE === $this->getDatabaseConnection()->exec_INSERTquery($this->logTable, $fieldValues)) {
            throw new \RuntimeException('Could not write log record to database', 1345036334);
        }
        return $this;
    }

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

}