![import org.hibernate.Session;
import org.hibernate.Transaction;
public class Main {
public static void main(String[] args) {
SessionFactory sessionFactory = HibernateConfig.getSessionFactory();
Session session = sessionFactory.openSession();
try {
Transaction transaction = session.beginTransaction();
// Perform database operations
YourEntityClass entity = new YourEntityClass();
entity.setProperty("value");
session.save(entity);
transaction.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
sessionFactory.close();
}
}
}](https://image.slidesharecdn.com/session3-hibernate-configurationwithannotations-240731100131-e65d5f77/85/Session-3-hibernate-Configuration-with-Annotations-pptx-10-320.jpg)
Session 3 - hibernate - Configuration with Annotations.pptx
- 2. Hibernate Configuration with Annotations • Hibernate is an Object-Relational Mapping (ORM) framework for Java • Allows you to map Java objects to database tables and vice versa. • When using Hibernate with annotations, you can configure the mapping between your Java classes and the database tables without the need for XML configuration files.
- 3. Step-by-step Guide To Configuring Hibernate Using Annotations: 1. Set up the Hibernate dependencies: – Make sure you have the necessary Hibernate dependencies in your project. – This typically includes the Hibernate core library, the appropriate database driver for your database, and the Java Persistence API (JPA) libraries. 2. Configure the Hibernate properties: – Create a properties file (e.g., hibernate.properties) or a configuration class to set up the Hibernate properties
- 4. Example using properties file # Database connection properties hibernate.connection.driver_class = your.database.driver.Class hibernate.connection.url = jdbc:mysql://localhost:3306/your_database hibernate.connection.username = your_username hibernate.connection.password = your_password # Hibernate properties hibernate.dialect = org.hibernate.dialect.MySQLDialect hibernate.hbm2ddl.auto = update
- 5. 3. Create the Hibernate configuration class: – You can create a configuration class that will initialize the Hibernate configuration using the annotations. – Here's an example of a configuration class:
- 6. import org.hibernate.cfg.Configuration; public class HibernateConfig { private static SessionFactory sessionFactory; public static SessionFactory getSessionFactory() { if (sessionFactory == null) { try { // Create a Configuration instance Configuration configuration = new Configuration(); // Configure Hibernate using the properties file configuration.configure("hibernate.properties"); // Add annotated classes configuration.addAnnotatedClass(YourEntityClass1.class); configuration.addAnnotatedClass(YourEntityClass2.class); // Add other entity classes as needed // Build the SessionFactory sessionFactory = configuration.buildSessionFactory(); } catch (Throwable ex) { System.err.println("SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } return sessionFactory; } }
- 7. 4. Define your entity classes: – Create your entity classes, which represent your database tables. – Annotate them with Hibernate annotations to define the mapping between the classes and the database tables – Example follows:
- 8. Example import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class YourEntityClass { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; // Other properties and getters/setters }
- 9. 5. Perform database operations: – You can now use the SessionFactory to create Session instances – And perform database operations. – Example Follows :
- 10. import org.hibernate.Session; import org.hibernate.Transaction; public class Main { public static void main(String[] args) { SessionFactory sessionFactory = HibernateConfig.getSessionFactory(); Session session = sessionFactory.openSession(); try { Transaction transaction = session.beginTransaction(); // Perform database operations YourEntityClass entity = new YourEntityClass(); entity.setProperty("value"); session.save(entity); transaction.commit(); } catch (Exception e) { e.printStackTrace(); } finally { session.close(); sessionFactory.close(); } } }