DAL-Data Access Layer 数据访问层
DAL Data Accession List 数据登记入册清单
DAL Data Access Line 数据存取线路
dal data access language 数据访问语言
DAL Data Access Layer 数据访问层
However, while the DAL cleanly separates the data access details from the presentation layer, it does not enforce any business rules that may apply.
不过，即使DAL将数据访问的细节从表示层中分离出来了，可它却不能处理任何的业务规则。
This layer also handles the requests from the Presentation layer and interacts with the DAL to retrieve the data from the back end and request the DAL to perform data persistence.
这个层还处理来自表示层的请求，并与DAL交互以便从后端检索数据并请求DAL执行数据持久性。
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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