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ejbCreate(), Creates a new entity bean ejbPostCreate() instance; initial state of the bean is specified by parameters in the create() call. A new row with these values must be inserted into the database. ejbLoad() Loads instance variable values, reading them from the persistent data in the database. Stores instance variable values, saving them persistently in the database. Removes an entity bean instance; the corresponding row in the database must be deleted.
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ejbRemove()
Table 22-1.
Corresponding Database and EJB Activities
Using Container-Managed Persistence
An entity bean s deployment descriptor specifies that an entity bean requires containermanaged persistence. The deployment descriptor also specifies the mapping between instance variables of the bean and columns in the underlying database. The deployment descriptor also identifies the primary key that uniquely identifies the bean and the corresponding database row. The primary key value is used in the database operations that store and retrieve variable values from the database. With container-managed persistence, the EJB container is responsible for maintaining synchronization between the entity bean and the database row. The container calls JDBC to store instance variable values into the database, to restore those values, to insert a new row into the database, and to delete a row all as required by actions on the bean. The container will call the bean s ejbStore() callback method before it stores values in the database, to notify the bean that it must get its variable values into a consistent state. Similarly, the container will call the bean s ejbLoad() callback method after loading values from the database, to allow the bean to do appropriate post processing (for example, calculating a value that was not itself persisted, based on values that were). In the same way, the bean s ejbRemove() method will be called before the container deletes the row from the database, and ejbCreate() and
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ejbPostCreate() are called in conjunction with inserting a new row. For many entity beans, these callback methods will be empty, since the container handles the actual database operations.
Using Bean-Managed Persistence
If an entity bean s deployment descriptor specifies bean-managed persistence, the container assumes that the entity bean will handle its own database interaction. When a new entity bean is first created, the container calls the bean s ejbCreate() and ejbPostCreate() methods. The bean is responsible for processing the corresponding INSERT statement for the database. Similarly, when an entity bean is to be removed, the container calls the bean s ejbRemove() method. The bean is responsible for processing the corresponding DELETE statement for the database, and when the bean returns from the ejbRemove() method, the container is free to actually remove the bean itself and reuse its storage. Bean loading is similarly handled by a container call to ejbLoad(), and storing by a call by the container to ejbStore(). The bean is similarly notified of passivation and activation by callbacks from the container. Of course, nothing limits the entity bean s database interaction to these callback methods. If the bean needs to access the database during the execution of one of its methods, the bean can make whatever JDBC calls it needs. The JDBC calls within the callback methods are strictly focused on managing bean persistence.
Container-Managed and Bean-Managed Trade-Offs
You might naturally ask why you would ever want to use bean-managed persistence when container-managed persistence eliminates the need to worry about synchronizing with the database. The answer is that container-managed persistence has some limitations: I Multiple databases. For most application servers, entity beans must be mapped into a single database server. If entity bean data comes from multiple databases, then bean-managed persistence may be the only way to handle database synchronization. I Multiple tables per bean. Container-managed persistence works well when all of the instance variables for an entity bean come from a single row of a single table i.e., when there is a one-to-one correspondence between bean instances and table rows. If an entity bean needs to model a more complex object, such as an order header and individual line items of an order, which come from two different, related tables, bean-managed persistence is usually required, because the bean s own code must provide the intelligence to map to and from the database.
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