10、Java Persistence: Mastering the EntityManager

Java EntityManager使用全解析

docker8compose

于 2025-08-12 15:29:31 发布

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分类专栏： Java EE数据库驱动应用开发指南文章标签： Java Persistence EntityManager ORM

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Java Persistence: Mastering the EntityManager

1. Introduction to EntityManager

Object/relational mapping (ORM) provides the persistence provider with details on how to map entities to database tables and define relationships between entities. However, it doesn’t handle the management of entity instances and their life cycles. The EntityManager, a Java Persistence API interface, fills this gap by offering methods to manipulate entities mapped to relational tables.

The EntityManager can be used in both Java EE and Java SE environments. In Java EE, it can be utilized in EJB components, Java EE web components, and Java EE application clients. To use the EntityManager in your application, follow these key steps:
1. Create entities based on the underlyi