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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
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="" xmlns:xsi="" xsi:schemaLocation= "" 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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