It is an Optional element which is a factory for Transaction instances. TransactionFactory – The TransactionFactory interface available in org.hibernate package. ConnectionProvider is a way to obtain JDBC connections. We need to configure these classes in file or we can annotate that class with annotation.ĬonnectionProvider – The ConnectionProvider is an interface available in package. Persistent Objects – The Entity or POJO are persistent objects. Transaction tx = session.beginTransaction() We can get a Transaction reference using the session object. Transaction – Transaction is an interface available in or.hibernate package. Session session = sessionFactory.openSession() We can get a Session reference using SessionFactory. Session – Session is an interface available in org.hibernate package which provides different API to communicate java application to hibernate. See more details about Session and SessionFactory here. This sessionFactory object will have all the information that we have provided in file. SessionFactory sessionFactory = configuration.buildSessionFactory() We can get Session Factory using the Configuration object as below. SessionFactory – SessionFactory is an interface available in org.hibernate package which extends Referenceable and Serializable interface and provides factory methods to get session object. The Configuration object is used to create a SessionFactory reference. The Configuration class reads information from the configuration file ( or another configuration file) and create a Configuration object.Ĭonfiguration configuration = new Configuration().configure("") We will see Hibernate and ORM components and architecture in depth.Ĭonfiguration – We provide hibernate database and details in the configuration file(for eg. For example, we have id, name, roll_number, and university columns in the database. With annotation, we are defining the database Book’s table column name. We are using the annotation with id, name, rollNumber, and university fields. In the above diagram, we have an entity called Student.java. In other words -ORM maps Java classes to the database table and Java data types(fields) to SQL data types(column). The mapping of Java classes(entity) with the table and entity’s field with the database’s column is called ORM. Similarly, all column in the table Book is mapped with entity’s fields using annotation.
The table BOOK is mapped in entity with annotation. Hibernate provides a lot of features and benefits over JDBC.Ĭonsider we have one java class (Called Entity in terms of hibernate/JPA) Book.java and one table BOOK in the database.Hibernate is open source and currently maintained by JBoss.See more details about Hibernate’s history and release here. Hibernate was introduced in 2001 by Gavin King.ORM stands for Object Relational Mapping which maps the object(entity) to data stored in the database. Hibernate is a framework that is used to communicate the java application to the database.We will also see about the architecture of Hibernate. N this post, we will see about Hibernate and ORM.
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