数据库技术及其发展趋势

Researching of database and it's developing trend

论述了数据库模型的发展所经历的层次型、网状型、关系型等三个阶段 ,指出其正在面向对象模型的方向发展 .数据库语言 SQL的标准化经历了 SQL89、SQL92、SQL99等阶段 ,它的完善标志着数据库技术的进步和成熟 .数据库操纵功能已溶入各高级语言之中 ,是否提供强大、方便、快捷的数据库开发和管理功能已成为衡量程序设计语言是否功能完善的重要指标之一 .以规范化理论为基础的数据库系统的设计已发展成为一个复杂完整的体系 .当今数据库发展的趋势 ,即数据库研究领域的不断拓展、智能数据库和数据仓库。

The development of database model experienced hiberarchy, netted, relation model, proceed to object oriented model. The standardization of SQL experienced SQL89, SQL92,SQL99, the perfect of SQL marked the progress and the mature of database technical. The function of Database manipulation was merged into every advance Language. Whether offering powerful, convenience develop and manage tools become one of important target of program design Language. With the developing of database, the research area of database was expanded, proceeding to intellective database, data warehouse, distributed three dimensional database--digital earth.