Refer to JPA 2 spec section 1 introduction for clarification of the role of JPA, which states very clearly "The technical objective of this work is to provide an object/relational mapping facility for the Java application developer using a Java domain model to manage a relational database."
有关JPA角色的说明，请参阅JPA 2规范第1节简介，其中非常清楚地说明“这项工作的技术目标是为Java应用程序开发人员提供一个对象/关系映射工具，使用Java领域模型来管理关系数据库。