By Deepak Vohra
EJB (Enterprise JavaBeans) 3.0 is a familiar database patience expertise in Java EE functions. EJB 3.0 has simplified the improvement of EJBs with an annotations-based API that gets rid of using remote/local interfaces, home/local domestic interfaces, and deployment descriptors. a couple of different books can be found on EJB 3.0, yet none covers EJB 3.0 aid in Oracle Fusion Middleware 11g, that's one of many leaders within the program server marketplace. this is often the 1st booklet that covers all points of EJB 3.0 database endurance improvement utilizing Oracle Fusion Middleware know-how. It covers all of the most sensible practices for database endurance making sure that your functions are simply maintainable. Leaving idea in the back of, this ebook makes use of real-world examples to lead you in construction your individual EJB 3.0 functions which are good built-in with usual Java EE frameworks.
Read or Download EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g PDF
Best languages & tools books
SOA for the Business Developer: Concepts, BPEL, and SCA
Service-Oriented structure (SOA) is a manner of organizing software program. in the event that your company's improvement tasks adhere to the foundations of SOA, the end result could be a listing of modular devices known as "services," which permit for a fast reaction to alter. This e-book tells the SOA tale in an easy, ordinary demeanour that can assist you comprehend not just the buzzwords and advantages, but in addition the applied sciences that underlie SOA: XML, WSDL, cleaning soap, XPath, BPEL, SCA, and SDO.
Additional info for EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g
Sample text
GetResultList(); A persistence unit defines a set of entities that are mapped to a single database and managed by an EntityManager. A persistence unit is defined in the persistence. xml deployment descriptor, which is packaged in the META-INF directory of an entity bean JAR file. xml file is persistence, which has one or more persistence-unit sub-elements. The persistence-unit element consists of the name and transaction-type attributes and subelements description, provider, jta-data-source, non-jta-data-source, mapping-file, jar-file, class, exclude-unlisted-classes, and properties.
An entity instance is created with the new operator and persisted using the EntityManager API. find("CatalogBean", catalogId)); The @NamedQuery annotation is used to specify a named query in the Java Persistence Query language, which is an extension of EJB-QL. The Java Persistence Query language further adds operations for bulk update and delete, JOIN operations, GROUP BY, HAVING, and subqueries, and also supports dynamic queries and named parameters. Queries may also be specified in native SQL.
The callback methods may be specified in a callback listener class instead of the bean class. 0. 0. 0 metadata annotations reduce the code required and make the deployment descriptors redundant. 0 entity beans, and only a POJO class is required for an entity bean. The Java Persistence API provides an object-relational mapping model. 0. 0 entity bean. 0 specification has facilitated the development of EJBs by providing an annotations-based API in which the remote/local and home/ local home interfaces are not required.