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。
The example in this article consists of the Data Abstract Layer (DAL), Data Transfer Objects (DTOs), the Business Logic Layer (BLL), the Presentation Layer, and supporting helper classes.
本文中的示例包含数据抽象层（DAL）、数据传输对象（DTO）、业务逻辑层（BLL）、表示层和用于支持的helper类。
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。
This system provides a support of presentation layer to the data file abstract syntax notation and the data grammatical conversion in order to achieve one's object of the sharing of data files.
该系统提供了表示层对数据文件抽象语法表示的支持及数据语法的转换，从而达到了数据文件共享的目的。
It gives the classes and hierarchical structure of them and the implementation of the design of logic layer, according to data and operation of practical business and encapsulation and abstract.
依据实际业务中对数据的操作要求，并对数据和操作进行封装和抽象，产生业务逻辑层的类及其类层次结构。实现对业务逻辑层的设计。
It gives the classes and hierarchical structure of them and the implementation of the design of logic layer, according to data and operation of practical business and encapsulation and abstract.
依据实际业务中对数据的操作要求，并对数据和操作进行封装和抽象，产生业务逻辑层的类及其类层次结构。实现对业务逻辑层的设计。
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