Query for a list of results.

        Typical usage::

            results = await self.query(...)

        Or::

            for row in await self.query(...)

async def query(self, stmt, *args):
        """Query for a list of results.

        Typical usage::

            results = await self.query(...)

        Or::

            for row in await self.query(...)
        """
        with (await self.application.db.cursor()) as cur:
            await cur.execute(stmt, args)
            return [self.row_to_obj(row, cur) for row in await cur.fetchall()]