Create a business object layer, called intermediate objects, which serves as a placeholder for data used in event evaluation.
创建业务对象层，即所谓的中间对象，它们将用作事件评估中使用的数据的占位符。
This is necessary to isolate the relational layer from the object layer, but this convenience comes at the cost of performance.
这对于将关系层与对象层分离是必需的，但这种便利是以牺牲性能为代价获得的。
The “bottom up" approach assumes you already have database table schema and need to develop an object layer and object relational mapping from the table schema.
“自下而上”方法假设已经有数据库表模式，而需要根据表模式开发一个对象层和对象关系映射。
Base class for attributes that define how properties of types in the object layer are mapped to the properties of entity types or complex types in the conceptual model.
特性的基类，这些特性定义如何将对象层中的类型映射到概念模型中的实体类型和复杂类型。
When the object layer is generated by the Entity Data Model tools, complex objects are instantiated when the complex type property is accessed, and not when the parent object is instantiated.
若对象层是由实体数据模型工具生成的，则复杂对象将在访问复杂类型属性而不是实例化父对象时进行实例化。
This makes the object layer an ideal target for Language-Integrated Query (LINQ) support.
这使得对象层成为集成语言查询(LINQ)的一个理想的操作目标。
In either case, you can automatically update your model when the underlying database changes and automatically generate object-layer code for your application.
无论使用哪一种方式，当基础资料库变更时，您都可以自动更新模型，而且可以自动产生应用程序的物件层程序码。
In either case, you can automatically update your model when the underlying database changes and automatically generate object-layer code for your application.
无论使用哪一种方式，当基础资料库变更时，您都可以自动更新模型，而且可以自动产生应用程序的物件层程序码。
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