Introduction to JPA (JPA version 2.0)
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This document provides an overview of the Java Persistence API (JPA) which allows Java developers to manage relational data. It describes key concepts like entities, the entity manager, persistence contexts, and configuration files. Entities represent tables in a database and are annotated with @Entity. The entity manager performs CRUD operations and finds entities. Persistence contexts contain managed entity instances for a particular datastore.
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Java to database connectivity for beginners, Introduction to JDBC, Getting Started with java database programming, What is java database?, core java, java to standard edition, core java, java
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Introduction to JPA (JPA version 2.0)
- 1. JPA version 2.0 Tutorial ejlp12@gmail.com Dec 2011
- 2. Java Persistence API (JPA) The Java Persistence API provides an object/relational mapping facility to Java developers for managing relational data in Java applications. Provided by the javax.persistence package Part of EJB 3.0 specification (JSR 220) Enables persisting POJO to relational database Java Persistence consists of three areas: • The Java Persistence API • Object/relational mapping metadata (using annotations or in XML deployment descriptor) • The query language
- 3. Entity An entity is a lightweight persistence domain object. Typically, represents a table in a relational database An entity class must follow these requirements: annotated with the javax.persistence.Entity annotation. have a public or protected, no-argument constructor. not be declared final, including methods or persistent instance variables If an entity instance be passed by value as a detached object, such as through a session bean’s remote business interface, the class must implement the Serializable interface. may extend both entity and non-entity classes. persistent instance variables must be declared private, protected, or package-private, and can only be accessed directly by the entity class’s methods (get/set)
- 5. Persistence Context & Entity Manager Persistence context a set of managed entity instances that exist in a particular data store. The EntityManager interface defines the methods that are used to interact with the persistence context creates and removes persistent entity instances finds entities by the entity’s primary key allows queries to be run on entities
- 6. Entity Manager Container-Managed Entity Managers an EntityManager instance’s persistence context is automatically propagated by the container to all application components instance within a single Java Transaction Architecture (JTA) transaction. Usually used in Java EE environment @PersistenceContext EntityManager em; Application-Managed Entity Managers the persistence context is not propagated to application components, and the life cycle of EntityManager instances is managed by the application. Usually used in Java SE environment @PersistenceUnit EntityManagerFactory emf; EntityManager em = emf.createEntityManager();
- 7. Code Example: Insert data (persist object)
- 8. XML Configuration files persistance.xml Defines the database and entity manager options for deploying JPA applications Packaged in the META-INF directory of the project orm.xml Stores metadata to describe object-relational mappings Not really required – JPA spec emphasizes using annotation Mapping on this file overrides any mapping defined using annotations
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