EJB 應用程式
此頁面提供尋找 Enterprise Bean 相關資訊的起始點。
根據 Enterprise JavaBeans (EJB) 規格,Enterprise Bean 是 Java 元件,它們一般會實作 Java 2 Platform Enterprise Edition (J2EE) 應用程式的商業邏輯,以及存取資料。
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Enterprise Bean
Enterprise Bean 是一種可結合其他資源來建立 Java™ 應用程式的 Java 元件。Enterprise Bean 的類型有三種:Entity Bean、階段作業 Bean 和訊息驅動 Bean。Java EE application resource declarations
You can configure your Java Enterprise Edition (Java EE) applications to declare dependencies on external resources and configuration parameters. These resources might be injected into the application code, or might be accessed by the application through the Java Naming and Directory Interface (JNDI).Message-driven beans - automatic message retrieval
WebSphere® Application Server supports the use of message-driven beans as asynchronous message consumers.Access intent policies for EJB 2.x entity beans
An access intent policy is a named set of properties or access intents that govern data access for Enterprise JavaBeans (EJB) persistence. You can assign policies to an entity bean and to individual methods on an entity bean's home, remote, or local interfaces during assembly. You can set access intents only within EJB Version 2.x-compliant and later modules for entity beans with CMP Version 2.x.Java Persistence API (JPA) architecture
Data persistence is the ability to maintain data between application executions. Persistence is vital to enterprise applications because of the required access to relational databases. Applications that are developed for this environment must manage persistence themselves or use third-party solutions to handle database updates and retrievals with persistence. The Java Persistence API (JPA) provides a mechanism for managing persistence and object-relational mapping and functions for the EJB specifications.WebSphere Application Server 中的交易支援
WebSphere Application Server 內的交易服務提供對交易的支援。 應用程式使用交易的方式取決於應用程式元件的類型。


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