【摘要】 通过分析异构分布式数据库查询存在的主要问题,提出了一种基于消息机制的多层分布式体系结构,并应用J2EE核心设计模式将该体系结构映射为对应的软件架构。更多还原

【Abstract】 Through analyzing the questions in the query process of heterogeneous distributed database, the paper presents the multileveled structure for distributed database query system based on messages. With applying several core J2EE patterns, the system structure is mapped into certain software framework.更多还原