对基于专有遗留数据模型实现的基于对象的数据模型的评估。
Evaluation of an object-based data model implemented over a proprietary, legacy data model.
作者信息
Pollard D L, Hales J W
机构信息
Division of Medical Informatics, Duke University Medical Center, Durham, NC, USA.
出版信息
Proc Annu Symp Comput Appl Med Care. 1995:367-71.
Most computerized medical information today is contained in legacy systems. As vendors slowly move to open systems, legacy systems remain in use and contain valuable information. This paper evaluates the use of an object model imposed on an existing database to improve the ease with which data can be accessed. This study demonstrates that data elements can be retrieved without specific programming knowledge of the underlying data structure. It also suggests that underlying data structures can be changed without updating application code. Programs written using the object model were easier to program but ran greater than one order of magnitude slower than traditionally coded programs. In this paper, the legacy information system is introduced, the methods used to implement and evaluate the object-based data model are explained, and the results and conclusions are presented.
如今，大多数计算机化的医学信息都包含在遗留系统中。随着供应商逐渐转向开放系统，遗留系统仍在使用并包含有价值的信息。本文评估了将对象模型应用于现有数据库以提高数据访问便捷性的情况。该研究表明，无需具备底层数据结构的特定编程知识即可检索数据元素。研究还表明，可以在不更新应用程序代码的情况下更改底层数据结构。使用对象模型编写的程序更易于编程，但运行速度比传统编码的程序慢一个数量级以上。本文介绍了遗留信息系统，解释了用于实现和评估基于对象的数据模型的方法，并给出了结果和结论。
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