The business system structure, the abstract of the core entity relations and the technology applied to the system are given, designs the business process flow.
给出了业务体系结构、系统涉及的核心实体关系的抽象表示和系统应采用的技术，设计了业务处理流程。
More powerful representations, such as entity/relations or object models, are needed if one wants to perform a complex mapping of databases to each other or to query across heterogeneous databases.
更为有效的表达方法，例如实体关系或者对象模型，可以用来解决复杂的数据映射或者查询异构数据。
EJB finders provide the ability to return a subset of entity beans based on conditions defined using container-managed persistent fields and relations.
EJB查询工具通过使用容器管理的持续字段和关系来返回在已知条件基础上建立的实体bean的子集。
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