operations.py 文件源码

def create_check_constraint(self, name, condition, **kw):
        """Issue a "create check constraint" instruction using the
        current batch migration context.

        The batch form of this call omits the ``source`` and ``schema``
        arguments from the call.

        .. seealso::

            :meth:`.Operations.create_check_constraint`

        """
        raise NotImplementedError("not yet implemented")