They are required to map between the different formats when the data flows from the service interface down to the database and back.
当数据在服务接口与数据库之间来回流动时，需要用这些操作来完成不同格式之间的映射。
The Borland data Provider offers an ADO.NET interface for the developer with support for live data at design time, and the ability to connect to different database with just one set of components.
Borland Data Provider为开发人员提供了一个ADO.NET接口，其中包含了对设计时存活数据的支持，以及仅通过单一组件连接到不同数据库的能力。
But different search engine has different database, different search interface and different rules for searching.
但是不同的搜索引擎具有不同的数据库、查询界面和查询法则。
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