我选择将这个dao封装在一个接口中，这样我就能够切换数据访问层来使用不同的持久性策略。
I choose to wrap the DAO in an interface, so I can switch my data access layer to use different persistence strategies.
下一版本应该把重点放在服务接口，而不是数据访问和业务逻辑层。
The next version should focus less on the data access and business logic tiers and more on the service interface.
这个类是服务注册中心Repository类的一个具体实现，它为数据访问层提供了基础的接口。
This is a specific implementation of the Repository class for Service Registry, which provides the primary interface to the data access layer.
数据访问应用程序的其他层不会使用实现类的名称；它们总是引用和使用用户定义接口。
The implementation class name is never used by other layers of the data access application; they always reference and use the user-defined data access interface.
PDO并不是类似于PearDB的数据库抽象层，而更像一种采用了统一api(应用编程接口)的数据访问层。
PDO is not an abstraction layer like PearDB. PDO is a more like a data access layer which USES a unified API (Application Programming Interface).
访问层上，设计了内部数据访问接口，实现了本地数据和远程数据的透明访问。
In controlling layer, uniform interface is designed to implement the local data accessing and remote data accessing.
结合农村信用社信贷管理系统，对三层构架中的通用数据访问接口和安全控制实现进行了分析研究。
Integration of rural credit cooperatives' credit management system, the generic data access interface and security control implementation of the three-tier framework are analysed and researched.
系统使用五层体系结构，分别为：用户交互层，系统编程接口层，挖掘核心服务层，数据库访问层，数据库。
The system structure is a multilayer system structure with five layers. They are user interactive layer, system program interface layer, mining core service layer, data access layer, database layer.
中间层会定义一个接口，用于指定表示层访问数据的方式。
The middle tier defines an interface that specifies how the presentation tier accesses the data.
中间层会定义一个接口，用于指定表示层访问数据的方式。
The middle tier defines an interface that specifies how the presentation tier accesses the data.
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