By data access interface, components can get data objects which encapsulate a set of logistically relational data, and have no use for logic and physical structure of store.

• 通过数据接口可以得到一组逻辑上相关的数据，它们被封装成数据对象，而业务逻辑层组件不需要了解这些数据对象的具体逻辑存储和物理存储结构。