What is Entity Bean. What are the various types of Entity Bean
Answered by Jey on 2005-05-08 12:47:06:
Entity bean represents the real data which is stored in the persistent storage like Database or file system. For example, There is a table in Database called Credit_card. This table contains credit_card_no,first_name, last_name, ssn as colums and there are 100 rows in the table. Here each row is represented by one instance of the entity bean and it is found by an unique key (primary key) credit_card_no.
There are two types of entity beans. 1) Container Managed Persistence(CMP) 2) Bean Managed Presistence(BMP)
RE: What is Entity Bean. What are the various types of Entity Bean
Entity bean represents the real data which is stored in the persistent storage like Database or file system. For example, There is a table in Database called Credit_card. This table contains credit_card_no,first_name, last_name, ssn as colums and there are 100 rows in the table. Here each row is represented by one instance of the entity bean and it is found by an unique key (primary key) credit_card_no.
There are two types of entity beans. 1) Container Managed Persistence(CMP) 2) Bean Managed Presistence(BMP)
RE: What is Entity Bean. What are the various types of Entity Bean
State is maintained in the database,the state of the enterprise bean persists longer than the request,the session,or even the server or container life time.This is why we sometimes say that entity beans survive a server crash. Flavours of Entity bean are:: 1)Container managed persistancy(CMP) These deligate their persitancy to their EJB container. 2)Bean managed persistancy(BMP) These manage their own persistancy means JDBC code to be written in bean itself.
RE: What is Entity Bean. What are the various types of Entity Bean
The entity bean is used to represent data in the database. It provides an object-oriented interface to data that would normally be accessed by the JDBC or some other back-end API. More than that, entity beans provide a component model that allows bean developers to focus their attention on the business logic of the bean, while the container takes care of managing persistence,transactions, and access control. There are two basic kinds of entity beans: container-managed ersistence (CMP)and bean-managed persistence(BMP).Container-managed persistence beans are the simplest for the bean developer to create and the most difficult for the EJB server to support. This is because all the logic for synchronizing the bean's state with the database is handled automatically by the container. This means that the bean developer doesn't need to write any data access logic, while the EJB server is supposed to take care of all the persistence needs automatically. With CMP, the container manages the persistence of the entity bean. Vendor tools are used to map the entity fields to the database and absolutely no database access code is written in the bean class .he bean-managed persistence (BMP) enterprise bean manages synchronizing its state with the database as directed by the container. The bean uses a database API to read and write its fields to the database, but the container tells it when to do each synchronization operation and manages the transactions for the bean automatically. Bean-managed persistence gives the bean developer the flexibility to perform persistence operations that are too complicated for the container or to use a data source that is not supported by the container.
