@classmethod
def _load_mx_exceptions(cls):
    """ Import mxODBC exception classes into the module namespace,
        as if they had been imported normally. This is done here
        to avoid requiring all SQLAlchemy users to install mxODBC.
        """
    global InterfaceError, ProgrammingError
    from mx.ODBC import InterfaceError
    from mx.ODBC import ProgrammingError
