January 2011

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<li style="background-image: url(http://www.javatpoint.com/images/r.jpg); background-position: 0px 3px; background-repeat: no-repeat no-repeat; font-family: Verdana; line-height: 1.5; margin-top: 3px; padding: 0px 12px;">Hibernate Architecture</li>
<li style="background-image: url(http://www.javatpoint.com/images/r.jpg); background-position: 0px 3px; background-repeat: no-repeat no-repeat; font-family: Verdana; line-height: 1.5; margin-top: 3px; padding: 0px 12px;">Elements of Hibernate Architecture<ol style="list-style: none; margin: 0px; padding: 0px 0px 0px 5px;">
<li style="background-image: url(http://www.javatpoint.com/images/r.jpg); background-position: 0px 3px; background-repeat: no-repeat no-repeat; line-height: 1.5; margin-top: 3px; padding: 3px 10px 0px;">SessionFactory</li>
<li style="background-image: url(http://www.javatpoint.com/images/r.jpg); background-position: 0px 3px; background-repeat: no-repeat no-repeat; line-height: 1.5; margin-top: 3px; padding: 3px 10px 0px;">Session</li>
<li style="background-image: url(http://www.javatpoint.com/images/r.jpg); background-position: 0px 3px; background-repeat: no-repeat no-repeat; line-height: 1.5; margin-top: 3px; padding: 3px 10px 0px;">Transaction</li>
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<li style="background-image: url(http://www.javatpoint.com/images/r.jpg); background-position: 0px 3px; background-repeat: no-repeat no-repeat; line-height: 1.5; margin-top: 3px; padding: 3px 10px 0px;">TransactionFactory</li>
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The Hibernate architecture includes many objects persistent object, session factory, transaction factory, connection factory, session, transaction etc.</div>
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There are 4 layers in hibernate architecture java application layer, hibernate framework layer, backhand api layer and database layer.Let's see the diagram of hibernate architecture:</div>
<img alt="hibernate architecture" src="http://www.javatpoint.com/images/hibernate/arc2.jpg" style="background-color: white; font-family: Verdana, Arial, sans-serif; font-size: 13px; line-height: 19.5px;" /><span style="background-color: white; font-family: Verdana, Arial, sans-serif; font-size: 13px; line-height: 19.5px;"></span><br />
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This is the high level architecture of Hibernate with mapping file and configuration file.</div>
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<img alt="hibernate architecture" src="http://www.javatpoint.com/images/hibernate/architecture.jpg" style="background-color: white; font-family: Verdana, Arial, sans-serif; font-size: 13px; line-height: 19.5px;" /><span style="background-color: white; font-family: Verdana, Arial, sans-serif; font-size: 13px; line-height: 19.5px;"></span><br />
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Hibernate framework uses many objects session factory, session, transaction etc. alongwith existing Java API such as JDBC (Java Database Connectivity), JTA (Java Transaction API) and JNDI (Java Naming Directory Interface).</div>
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Elements of Hibernate Architecture</h3>
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<tr><td style="line-height: 1.5; margin-left: 20px;">For creating the first hibernate application, we must know the elements of Hibernate architecture. They are as follows:</td></tr>
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SessionFactory</h4>
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The SessionFactory is a factory of session and client of ConnectionProvider. It holds second level cache (optional) of data. The org.hibernate.SessionFactory interface provides factory method to get the object of Session.</div>
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Session</h4>
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The session object provides an interface between the application and data stored in the database. It is a short-lived object and wraps the JDBC connection. It is factory of Transaction, Query and Criteria. It holds a first-level cache (mandatory) of data. The org.hibernate.Session interface provides methods to insert, update and delete the object. It also provides factory methods for Transaction, Query and Criteria.</div>
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Transaction</h4>
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The transaction object specifies the atomic unit of work. It is optional. The org.hibernate.Transaction interface provides methods for transaction management.</div>
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ConnectionProvider</h4>
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It is a factory of JDBC connections. It abstracts the application from DriverManager or DataSource. It is optional.</div>
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TransactionFactory</h4>
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It is a factory of Transaction. It is optional.</div>
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