By Raymond Turner
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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.