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Opening a Session
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Opening a session is similar to doing so in Hibernate in general, except you use AnnotationConfiguration to build the session factory: public class SessionManager { private static final SessionFactory sessionFactory = buildSessionFactory(); private static SessionFactory buildSessionFactory() { try { // Create the SessionFactory from hibernate.cfg.xml return new AnnotationConfiguration() .configure().buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed ex.printStackTrace(); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } } If the configuration file name isn t hibernate.cfg.xml (in this case, it s named annotation.cfg.xml), build the session factory the using the following statement: new AnnotationConfiguration() .configure("annotation.cfg.xml") .buildSessionFactory(); There are other overloaded configure() methods that you can use appropriately. This section uses a Data Access Object (DAO) for database operations. The DAO is a design pattern used to abstract and encapsulate all access to the data source. For this example, it contains code to create the SessionFactory and a Session object and to fetch and update data in the database: public class BookDAO { /** * To query all details of a book * @return */ public List<Book> readAll() { Session session = SessionManager.getSessionFactory().getCurrentSession(); session.beginTransaction(); List<Book> booksList = session.createQuery("from Book").list();
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session.getTransaction().commit(); return booksList; } /** * To create a book * @return */ public void create(Book bookObj) { Session session=SessionManager.getSessionFactory().getCurrentSession(); session.beginTransaction(); session.saveOrUpdate(bookObj); session.getTransaction().commit(); } } The readAll method queries all data from the BOOK table that s mapped in hibernate.cfg.xml. The create method inserts a new row into the BOOK table.
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1.5 Using Entity Manager
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Is there a generalized mechanism to configure ORM with less dependency on individual providers like Hibernate, TopLink, and so on
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A persistence context is defined by the JPA specification as a set of managed entity instances where the entity instances and their lifecycles are managed by an entity manager. Each ORM vendors provides its own entity manager, which is a wrapper around the core API and thus supports the JPA programming interfaces, JPA entity instance lifecycles, and the query language. This provides a generalized mechanism for object/relational development and configuration.
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How It Works
You obtain the Hibernate EntityManager from an entity manager factory. When container-managed entity managers are used, the application doesn t interact directly with the entity manager factory. Such entity managers are obtained mostly through JNDI lookup. In the case of application-managed entity managers, the application must use the entity manager factory to manage the entity manager and the persistence context lifecycle. This example uses the application-managed entity manager. EntityManagerFactory has the same role as the SessionFactory in Hibernate. It acts a factory class that provides the EntityManager class to the application. It can be configured either programmatically or
CHAPTER 1 STARTING WITH HIBERNATE
using XML. When you use XML to configure it, the file must be named persistence.xml and must be located in your classpath. Here s the persistence.xml file for the Book example: < xml version="1.0" encoding="UTF-8" > <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="book" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <class>com.hibernaterecipes.annotations.domain.Book</class> <properties> <property name="hibernate.connection.driver_class" value="org.apache.derby.jdbc.EmbeddedDriver"/> <property name="hibernate.connection.username" value="book"/> <property name="hibernate.connection.password" value="book"/> <property name="hibernate.connection.url" value="jdbc:derby://localhost:1527/BookShopDB"/> <property name="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect"/> </properties> </persistence-unit> </persistence> In this persistence.xml file, the complete unit is defined by <persistence-unit>. This name should match the name used when you create a EntityManagerFactory. The transaction-type RESOURCE_LOCAL is used here. Two transaction types define transactional behavior: JTA and RESOURCE_LOCAL. JTA is used in J2EE managed applications where the container is responsible for transaction propagation. For application-managed transactions, you can use RESOURCE_LOCAL. The <provider> tag specifies the third-party ORM implementation you use. In this case, it s configured to use the Hibernate Persistence provider. The entity instances are configured with the <class> tag. The rest of the properties are similar to what you configured in hibernate.cfg.xml, including the driver class of the database you re connecting to, the connection URL, a username, a password, and the dialect. Here s the code to create the EntityManagerFactory (EMF) from the configuration and to obtain the EntityManager from the EMF: package com.hibernaterecipes.annotations.dao; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence;
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