public function executeQuery($sql)
    {
        $result = $this->connection->query($sql);
        $this->errno = $this->connection->errno;
        $this->error = $this->connection->error;
        if($this->connection->errno) {
            echo 'Query Error ['.$this->errno.'] : '.$this->error.' : '.$sql;
        }
        if($this->errno == 1054) {
            echo 'Table not set properly in query';
        }
        return $result;
    }