Taking message hiding as a basic method, a technique that can improve the quality of MIS software is figured out by means of program abstracting and setting up abstract data layer.
利用程序抽象技术,以信息隐藏为基本手段,通过建立抽象数据层,探索出一条提高MIS软件质量的技术方法。
The Data Abstract Layer consists of a single class to provide location-related data to the business layer (see Figure 3).
数据抽象层包含一个类,用于向业务层提供关于位置的信息(请参见图 3)。
Data is retrieved from the location Data Provider — a Data Abstract Layer (DAL) component — which caches all locations in memory.
从位置数据提供者检索数据,这是一个数据抽象层(DAL)组件,在内存中缓存所有位置。
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