def RollbackAll(close=None):
    """
    Rollback all transactions, according Local.conn
    """
    if close:
        warnings.simplefilter('default')
        warnings.warn("close parameter will not need at all.", DeprecationWarning)

    for k, v in engine_manager.items():
        session = v.session(create=False)
        if session:
            session.rollback()
Rollback all transactions, according Local.conn