def asDict():
    """
        Returns the SQLObject instance as a dictionary (column names
        as keys, column values as values).

        Use like::

            ASQLObjectClass(a=1, b=2).asDict()

        Which should return ``{'a': 1, 'b': 2}``.

        Note: this is a *copy* of the object's columns; changing the
        dictionary will not effect the object it was created from.
        """
