How many types of interceptors are available in hibernate

Related - How to create a maven project in eclipse Jar dependencies Open pom. Entity; import javax. GeneratedValue; import javax. GenerationType; import javax. Hibernate Interceptor To create an interceptor, you can either implement the org. The Interceptor interface contains various methods as follows.

Methods Description onSave Called before an object is saved. Serializable; import org. LogManager; import org. Logger; import org. EmptyInterceptor; import org. Type; import com. HashMap; import java. Map; import org. These session scoped interceptors can bound to a particular session. A session-factory scoped interceptor can be specified with a configuration object prior to the SessionFactory. The provided interceptor will apply to all sessions opened by the session-factory.

In this example, I am going to intercept or manipulate the properties of a persistent object before going to save, update, delete, load or get. We can create an interceptor either implementing Interceptor interface or extending the EmptyInterceptor class. So, if we Implement the Interceptor Interface it forces us to override all the methods. So instead of we have another class EmptyInterceptor, we need to extend this class and override the method that we want.

Example of How to use Hibernate Interceptors? In this example, we will learn How to use Interceptor in Hibernate. Let us first create a configuration file hibernate. Cacheable; import javax.

Column; import javax. Entity; import javax. GeneratedValue; import javax. In hibernate 3 you can use SessionFactory. This way we can get a control at a session level and can enable interceptor for a desired sessions only.

Also refer highlighted section to get an idea how to update the value. We are updating the name of the book. Run Test Program — You can refer the logs on console. Also highlighted section confirms that name of the book has been updated. 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-. Depending on the type of event we would need to implement the Listener interface available in org. Event is getting passed in the listener and we can get the entity by calling getEntity method of listener. By default listener gets activated on all entities so we need to filter the entities using instaneof we are interested in. With Hibernate 4 events configured in hibernate. Follow below steps.

Create a file with name org. In this file you need to add the fully qualified class path of the integrator class like com. Similarly Hibernate comes with event and listener model which can be used to track the events.