Entity beans in java

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Basic Information of Entity Beans And Also It's Example

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Entity beans in java

  1. 1. ENTITY BEAN IN JAVA Hiren Jamod Department Of ComputerScience Saurastra University-Rajkot
  2. 2. ENTITY BEANS Enterprise Beans which represent persistent data stored in a storage medium, such as a relational database. Persists across multiple sessions and can be accessed by multiple clients. Each instance of the entity bean represent a row in the table EJB container creates instances of an entity bean and is responsible for loading data in an instance and storing the information (data) back into the database.
  3. 3. ENTITY BEANS The persistent mechanisms that enable you to perform these database manipulations, such as serialization, Object/Relationship (O/R) mapping to a relational database and support for JDBC are built-in the entity bean model
  4. 4. CHARACTERISTICS Persistence Implies that its state exists even after a client stops accessing an application The persistent data remain intact even after the storage shuts down Shared Access Multiple clients can share one entity bean by using separate instances of the entity bean EJB Container maintains data consistency by synchronizing entity bean instances with the database To maintain data consistency, the entity beans work within a transaction
  5. 5. CHARACTERISTICS Primary Key Each Entity bean has unique identifier; is known as Primary Key that enables the client to locate the exact entity bean Relationships Like the data of a relational database, the entity beans are also elated to each other
  6. 6. LIFE CYCLE OF ENTITY BEANS
  7. 7. LIFE CYCLE OF ENTITY BEANS Initially, the beans do not exist When the Application server this stage to the Pooled stage When the server is first started, several bean instances are created and placed in the pool. A bean instance in the pooled state is not ties to particular data At this stage, the beans are referred as passivated. The bean remains in this stage till the client does not make a request for it or the container does not activate it.
  8. 8. LIFE CYCLE OF ENTITY BEANS The bean’s business methods can be invoked when the bean is at the ready stage. It remains at this stage till the client calls its remove method or the container passiveness it if the bean has been lying idle for sometimes
  9. 9. EJB SOURCE CODE Home Interface (extends EJBHome)  Create - Find (for Entity)  Factory Pattern Remote Interface (EJBObject)  “Business Methods”  Proxy Pattern Bean Class (EntityBean) Deployment descriptor (ejb-jar.xml)
  10. 10. CRAETE APPLICATION
  11. 11. GIVE NAME OF CRAETE APPLICATION
  12. 12. ADD SESSION BEAN
  13. 13. GIVE NAME OF SESSION BEAN
  14. 14. ADD PERSISTENCE UNIT
  15. 15. GIVE NAME PERSISTENCE UNIT
  16. 16. ADD ENTITY CLASS
  17. 17. ADD REFERENCE INTO WEB.XML
  18. 18. DECLER INTERFACE
  19. 19. DEFINE INTERFACE AND OVERRIDEMETHOD
  20. 20. DEFINE ENTITY BEANCLASS
  21. 21. DEFINE INDEX PAGE
  22. 22. DEFINE INDEX PAGE
  23. 23. DEFINE INDEX PAGE
  24. 24. DEFINE INDEX PAGE
  25. 25. SPECIAL THANKS T0 AMIT SIRTO GIVE ME OPPORTUNITY TO REPRESENT MYPRESENTATION. BY HIREN JAMOD

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