Data Abstraction Layer的意思|示意

The Hibernate framework is a data access abstraction layer that is called by your application for data persistence.

Hibernate框架是应用程序调用来实现数据持久性的数据访问抽象层。

Dojo's data abstraction layer, dojo.data, provides a standard API for dojo applications to access a variety of back-end services.

dojo的数据抽象层dojo . data，为dojo提供一个标准API来访问各种后端服务。

PDO provides a data-access abstraction layer, which means that, regardless of which database you're using, you use the same functions to issue queries and fetch data.

PDO提供了一个数据访问抽象层，这就意味着，不管你使用的是哪种数据库，你都可以用同样的函数去进行查询的获取数据。

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).

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。

Semantic technologies provide an abstraction layer above existing IT technologies, one that enables the bridging and interconnection of data, content, and processes across business and IT silos.

Semantic技术在现有的IT技术之上提供了一层抽象，它跨越业务和IT仓库在数据、内容和过程之间架设了一座桥梁，使其可以相互连接在一起。

It has to, in effect, introduce a layer of abstraction, allowing for changes in a data layer with no or minimal impact to service implementations.

实际上，它需要引入一个抽象层，以允许数据层的更改而不影响服务实现或将这种影响降到最低。