当您为应用程序创建了模型并设置好数据库之后，您就可以为它启用管理界面了。
Once you have created the models for your application and set up your database Settings, you can enable the admin interface for your application.
Rational项目可以包含多个数据存储库，例如需求项目、变更管理(缺陷)数据库、测试数据存储库或Rose模型。
A Rational project can contain multiple datastores such as a requirements project, change management (defect) database, test datastore, or a Rose model.
DbContext是ObjectContext的简化版本，提供了基本的模型缓存、数据库供应、连接管理及模式创建等功能。
DbContext is a simplified version of ObjectContext, providing basic functionality for model caching, database provisioning, connection management, and schema creation. An example looks as following.
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