orm.py 文件源码

def is_new(self):
        stmt = (select([ShakeMap.__table__.c.shakecast_id])
                    .where(and_(ShakeMap.__table__.c.shakemap_id == self.shakemap_id,
                                ShakeMap.__table__.c.shakemap_version == self.shakemap_version)))

        result = engine.execute(stmt)
        shakemaps = [row for row in result]

        if shakemaps:
            return False
        else:
            return True