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The Hello World example in chapter 2 introduced you to Hibernate; however, it isn t very useful for understanding the requirements of real-world applications with complex data models. For the rest of the book, we ll use a much more sophisticated example application an online auction system to demonstrate Hibernate. In this chapter, we start our discussion of the application by introducing a programming model for persistent classes. Designing and implementing the persistent classes is a multistep process that we ll examine in detail. First, you ll learn how to identify the business entities of a problem domain. We create a conceptual model of these entities and their attributes, called a domain model. We implement this domain model in Java by creating a persistent class for each entity. (We ll spend some time exploring exactly what these Java classes should look like.) We then define mapping metadata to tell Hibernate how these classes and their properties relate to database tables and columns. This involves writing or generating XML documents that are eventually deployed along with the compiled Java classes and used by Hibernate at runtime. This discussion of mapping metadata is the core of this chapter, along with the in-depth exploration of the mapping techniques for fine-grained classes, object identity, inheritance, and associations. This chapter therefore provides the beginnings of a solution to the first four generic problems of ORM listed in section 1.4.2, Generic ORM problems. We ll start by introducing the example application.

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The CaveatEmptor online auction application demonstrates ORM techniques and Hibernate functionality; you can download the source code for the entire working application from the web site http://caveatemptor.hibernate.org. The application will have a web-based user interface and run inside a servlet engine like Tomcat. We won t pay much attention to the user interface; we ll concentrate on the data access code. In chapter 8, we discuss the changes that would be necessary if we were to perform all business logic and data access from a separate business-tier implemented as EJB session beans. But, let s start at the beginning. In order to understand the design issues involved in ORM, let s pretend the CaveatEmptor application doesn t yet exist, and that we re building it from scratch. Our first task would be analysis.

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Variables beginning with U_ are URLs, which are typically used inside hyperlinks in HTML. Variables beginning with T_ are theme attributes, which correspond to the available customization options in the Styles Administration panel. Variables beginning with S_ are system variables. You ll rarely encounter these. Variables beginning with L_ represent strings that are taken from the active language file.

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A software development effort begins with analysis of the problem domain (assuming that no legacy code or legacy database already exist). At this stage, you, with the help of problem domain experts, identify the main entities that are relevant to the software system. Entities are usually notions understood by users of the system: Payment, Customer, Order, Item, Bid, and so forth. Some entities might be abstractions of less concrete things the user thinks about (for example, PricingAlgorithm), but even these would usually be understandable to the user. All these entities are found in the conceptual view of the business, which we sometimes call a business model. Developers of object-oriented software analyze the business model and create an object model, still at the conceptual level (no Java code).This object model may be as simple as a mental image existing only in the mind of the developer, or it may be as elaborate as a UML class diagram (as in figure 3.1) created by a CASE (Computer-Aided Software Engineering) tool like ArgoUML or TogetherJ. This simple model contains entities that you re bound to find in any typical auction system: Category, Item, and User. The entities and their relationships (and perhaps their attributes) are all represented by this model of the problem domain. We call this kind of model an object-oriented model of entities from the problem domain, encompassing only those entities that are of interest to the user a domain model. It s an abstract view of the real world. We refer to this model when we implement our persistent Java classes. Let s examine the outcome of our analysis of the problem domain of the CaveatEmptor application.

If you end up creating your own template variables, you ll want to make sure that the prefixes you use for your links and language strings are consistent with the prefixes shown in Table 12-5. This helps you know what a template variable represents without having to dig inside the phpBB code to find its definition.

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