【摘要】 使用容器管理的永久性实体EJB,无法实现属性跨越多个继承的DBMS。通过集成WAS和多重数据库服务器,进行EJB的开发、测试和部署,可以透明地处理多个DBMS的关系,利用基于视图法和直接映射法,可实现CMP实体Bean对多个数据源的访问。当电子商务应用的关键数据存在于多种数据源中,且拥有处理管理问题的数据库功能时,这种技术组合是最佳选择。更多还原

【Abstract】 Using container management entities EJB cannot realize to design attributes beyond more succeeded DBMSs.Through integrating WAS and a multiple databases server,EJB developments,tests and deployments are implemented,and many DBMS relations may be transparently processed.Using view-based methods and direct mapping methods,CMP entity bean may access multi data sources.When key data of e-commerce applications exists in multiple data sources and has database functions dealing with the managements,this method is the best option.更多还原