在資訊系統的開發及維護上,資料庫及應用程式分屬於兩個不同的知識領域,過程中需要由資料庫管理人員及程式開發人員進行溝通協調,使得應用程式能夠正確地存取資料庫。資料庫資料規格一旦有修改,應用程式必須要配合,耗費相當多人力及時間。本文以資料隱蔽之資料規格修改舉例說明上述現象,探討未導入物件關聯對應技術與導入物件關聯對應技術間,應用程式在配合修改上的複雜度比較。 There are two different knowledge domain, database and application, in the developing and the maintaining of an information system. The database administrators must negotiate effectively with the programmers to ensure that applications accessing databases correctly. When the data schema of the database changes, so do the applications, which also means costing much time and manpower. This article illustrates this kind of situation by examples, and discusses the complexity of changing in applications between none ORM and using ORM technology.