Get the data from raw_data_id from the server.
    :returns: The ``data`` if fetching worked, ``None`` if it failed.

def _fetch_data_from_server(raw_data_id, mysql_cfg):
    """Get the data from raw_data_id from the server.
    :returns: The ``data`` if fetching worked, ``None`` if it failed."""
    import pymysql
    import pymysql.cursors

    # Import configuration file
    cfg = utils.get_database_configuration()
    if cfg is None:
        return None

    # Establish database connection
    connection = pymysql.connect(host=cfg[mysql_cfg]['host'],
                                 user=cfg[mysql_cfg]['user'],
                                 passwd=cfg[mysql_cfg]['passwd'],
                                 db=cfg[mysql_cfg]['db'],
                                 cursorclass=pymysql.cursors.DictCursor)
    logging.info("Connection: %s", str(connection))
    cursor = connection.cursor()

    # Download dataset
    sql = ("SELECT `id`, `data` "
           "FROM `wm_raw_draw_data` WHERE `id`=%i") % raw_data_id
    cursor.execute(sql)
    return cursor.fetchone()