Controlling the ETL work in this manner can be useful for guaranteeing the proper sequence for loading data warehouse tables that contain primary or foreign key dependencies.

以这种方式控制ETL工作，对于保证按适当次序装载包含主键或外键依赖的数据仓库表十分有用。

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The key technologies for establishing an N-layer data warehouse with prototyping method are given and the advantages of this method are also presented in this paper.

文中给出了运用面向对象原型法建立N层数据仓库的关键技术，并阐述了利用原型法进行N层数据仓库开发的优点。

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