What do interceptors do in Hibernate?

The Hibernate Interceptor is an interface that allows us to react to certain events within Hibernate. With such a callback, an application can intercept core Hibernate’s operations such as save, update, delete, etc. There are two ways of defining interceptors: implementing the org.

How many SessionFactory are created per application in Hibernate session?

one SessionFactory object
SessionFactory Object The SessionFactory is a heavyweight object; it is usually created during application start up and kept for later use. You would need one SessionFactory object per database using a separate configuration file.

Which event is called after object is loaded from database in Hibernate?

onLoad. Called after an entity is loaded. It is illegal to access the Session from inside this method. However, the object may keep a reference to the session for later use.

How many objects are there in Hibernate architecture?

The Hibernate architecture includes many objects such as persistent object, session factory, transaction factory, connection factory, session, transaction etc. The Hibernate architecture is categorized in four layers. This is the high level architecture of Hibernate with mapping file and configuration file.

What do you need to know about hibernate interceptors?

2. Defining Hibernate Interceptors. The Hibernate Interceptor is an interface that allows us to react to certain events within Hibernate. These interceptors are registered as callbacks and provide communication links between Hibernate’s session and application.

Which is the best way to register a hibernate event?

We’ve seen how to define and register Hibernate interceptors either as Session -scoped or SessionFactory -scoped. In either case, we must ensure that the interceptors are serializable especially if we want a serializable session. Other alternatives to interceptors include Hibernate Events and JPA Callbacks.

When to use event system instead of interceptors?

If you have to react to particular events in your persistence layer, you can also use the Hibernate3 eventarchitecture. The event system can be used in addition, or as a replacement, for interceptors. All the methods of the Sessioninterface correlate to an event.

What are the most common events in hibernate?

Hibernate comes with an event system (a concept of listeners and event ) l and we can configure the events we want to track in the form of listeners. Most commonly used events are- Pre – Select: : these types of event are fired before executing any select statement.