Prepares to store this column for the a particular backend database.

        :param backend: <orb.Database>
        :param py_value: <variant>
        :param context: <orb.Context>

        :return: <variant>

def dbStore(self, typ, py_value, context=None):
        """
        Prepares to store this column for the a particular backend database.

        :param backend: <orb.Database>
        :param py_value: <variant>
        :param context: <orb.Context>

        :return: <variant>
        """
        if py_value is None:
            return None
        return self.valueToString(py_value, context=context)