    function selectObjectBySql($sql) {
        //$logFile = "C:\\xampp\\htdocs\\supserg\\tmp\\queryLog.txt";
        //$lfh = fopen($logFile, 'a');
        //fwrite($lfh, $sql . "\n");    
        //fclose($lfh);                 
        $res = @mysqli_query($this->connection, $sql);
        if ($res == null)
            return null;
        return mysqli_fetch_object($res);
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.