摘要
1.引言 B2B电子商务和电子政务系统中涉及的信息与在线购物系统等简单的数据采集系统中涉及的信息具有明显的差别,这些信息对于整个业务流程均产生重要的影响,信息的种类繁多,数据模型复杂,覆盖范围广,且数据正确性和安全性要求很高。数据采集和管理系统所面对的数据对象具有多维的特性。每个维又划分为多个汇总层次,同一层次可以有多个元素,相互之间称为兄弟,上一层次的元素由下一层次的元素汇总而成,最低层元素为叶子元素,所有元素及其层次关系构成属性结构。各维汇总层次根据用户需求灵活定义,形成各个方向的多层次汇总,包括轻度汇总和高度汇总。
In a Web-based e-Government and e-Commerce system, data acquisition and management is the core function of the system. Usually, the amount of data in this system is very large, and the data model is more complex. Because the system requirements and rules on data statistic are often changed, we must modify the data model and algorithms on statistics. It will lead to update the system usually. Additionaly, we must manage and store the data in the system into the database because of the importance of data. So, how to implement the functions of data acquisition and storage based on this kind of data model is the research topic for software designers. In this paper, we will reform the existing definition of data dictionary, and present a whole new dictionary for data control model for integrating data definitaion, data representation, and data checking and statistics together.
出处
《计算机科学》
CSCD
北大核心
2002年第9期116-118,68,共4页
Computer Science
关键词
数据库
XML
数据字典
数据文件
元数据对象
分级控制模型
Data acquisition and management system, Data dictionary, Meta data object, Control model, XML
