defenses
发表于 2025-3-26 23:00:24
Managing Persistent Objects,oviders to do most of the work without much code, but the richness of JPA also allows customized mapping from objects to tables using either annotation or XML descriptors. From simple mapping (changing the name of a column) to more complex mapping (inheritance), JPA offers a wide spectrum of customi
GRAIN
发表于 2025-3-27 03:25:05
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商议
发表于 2025-3-27 05:35:18
Enterprise Java Beans,jects that encapsulate and map their attributes to a relational database, thanks to annotations. The idea is to keep the entities as transparent as possible and not intermingle them with business logic. Entities can have methods to validate their attributes, but they are not made to represent comple
欢笑
发表于 2025-3-27 10:32:37
Session Beans and the Timer Service,on logic. I will now show you how to develop a business layer that handles these persistent objects using session beans. Session beans handle complex tasks that require interaction with other components (entities, web services, messaging, etc.). This logical separation between entities and session b
Obstreperous
发表于 2025-3-27 15:00:52
Transactions and Security,. Both services are low-level concerns that a business developer shouldn’t have to code himself. EJBs provide these services in a very simple way: either programmatically with a high-level of abstraction or declaratively using metadata.
SLAG
发表于 2025-3-27 20:09:19
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独白
发表于 2025-3-28 00:21:12
Pages and Components,ices, we need a presentation layer to interact with end users, preferably one that runs in a browser. Browsers are everywhere, and user interfaces are richer, more dynamic, and easier to use. Rich Internet Applications (RIAs) are gaining in popularity as users expect more from their browsing experie
sclera
发表于 2025-3-28 04:58:07
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accomplishment
发表于 2025-3-28 09:13:51
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fixed-joint
发表于 2025-3-28 10:40:43
Java Persistence, as the underlying persistence engine. . store data in tables made of rows and columns. Data is identified by ., which are special columns with uniqueness constraints and, sometimes, indexes. The relationships between tables use . and . with integrity constraints.