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n Database-independence
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The container, not the enterprise bean provider, maintains database access code to most popular databases. Features such as full-text search are available for use by the enterprise bean provider.
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CMP Cons Drawbacks to container-managed persistence include the following:
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Only container-supported algorithms persistence can be used. Portability to other EJB containers may be lost.
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The developer has no access to the view and cannot modify the actual code. Sometimes, the generated SQL is not the most efficient with respect to performance.
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State the Bene ts and Costs of Container-Managed Persistence
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When using BMP, the bean is responsible for storing and retrieving persisted data. The entity bean interface provides methods for the container to notify an instance when it needs to store or retrieve data. In BMP mode, the EJB must implement persistence. To do this, methods such as ejbStore() and ejbLoad() must be created and used, and communication with SQL databases must be implemented manually using JDBC. BMP works well when data is being persisted to something other than a relational database, such as file system or a legacy enterprise application. When a bean manages its own persistence, it must also define its own JDBC calls. In this case, the entity bean is directly responsible for saving its own state. On the other hand, the container isn t required to make any database calls. Some benefits and drawbacks of BMP are detailed next.
BMP Pros Benefits of bean-managed persistence include the following:
n Container independent n Standards based
Entity bean code written for one EJB container should be easily portable to any other certified EJB container. The standard EJB and JDBC APIs can be used for data access calls.
n Datatype access
The ability to access nonstandard datatypes and legacy applications is supported. Data validation logic of any complexity is supported. The application is able to take advantage of nonstandard SQL features of different SQL servers.
n Maximum flexibility
n Database specific features
BMP Cons Drawbacks to bean-managed persistence include the following:
n Database specific
Because entity bean code is database specific, if access to multiple databases is required, the enterprise bean provider will have to account for this in its data access methods. The enterprise bean provider must have knowledge of SQL.
n Knowledge of SQL n Development time
These beans on average take much longer time to develop as much as five times longer.
7: Enterprise JavaBeans and the EJB Container Model
The Composition of a CMP Entity Bean
The many components of EJB entity beans must interact with each other and with their container. The following is a summary of the javax.ejb package entity bean components and the methods they use. The enterprise bean provider creates some of these components. The EJB container, building on what the enterprise bean provider created, generates the remainder of the required components.
Components Created by the Enterprise Bean Provider The enterprise bean provider is responsible for the creation of classes and interfaces. Business logic is placed in classes. Interfaces are used to define how the EJB container should build supporting objects as well as to define what business methods are to be visible to clients. The following sections describe varieties of these components in further detail. The Primary Key Class The primary key is a unique identifier of an object. The primary key class doesn t necessarily have to relate directly to the primary key of a database table. Quite often, it isn t necessary to create a primary key class because you can use Java objects already defined in the entity bean class (for example, strings or integers) as primary keys. Note that Java s primitive datatypes (such as int) can be used only when wrapped by Java objects. A primary key class is defined within the deployment descriptor file. Although an entity bean class can define a unique class as its primary key, it is still possible for several entity beans to share the same primary key class. The Remote Home Interface Interface EJBHome The enterprise bean provider creates the remote home interface so that the EJB container can create an EJBHome object. The EJBHome object can be used to create, destroy, and find entity bean objects inside a home domain. When the EJB container implements the remote home interface, it enables clients to
n Create new entity objects within a home domain n Find existing entity objects within a home domain n Remove an entity object from a home domain n Execute a home instance business method n Obtain a handle to the home interface n Get metadata information allowing for loose client/server binding
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