Florida web design - Alternative entity representation MAP No Java classes are
Sunday, November 25th, 2007Alternative entity representation MAP No Java classes are required; entities are represented in the Java application with HashMaps. This mode allows quick prototyping of fully dynamic applications. DOM4J No Java classes are required; entities are represented as XML elements, based on the dom4j API. This mode is especially useful for exporting or importing data, or for rendering and transforming data through XSLT processing. There are two reasons why you may want to skip the next section and come back later: First, a static domain model implementation with POJOs is the common case, and dynamic or XML representation are features you may not need right now. Second, we re going to present some mappings, queries, and other operations that you may not have seen so far, not even with the default POJO entity mode. However, if you feel confident enough with Hibernate, read on. Let s start with the MAP mode and explore how a Hibernate application can be fully dynamically typed. 3.4.1 Creating dynamic applications A dynamic domain model is a model that is dynamically typed. For example, instead of a Java class that represents an auction item, you work with a bunch of values in a Java Map. Each attribute of an auction item is represented by a key (the name of the attribute) and its value. Mapping entity names First, you need to enable this strategy by naming your business entities. In a Hibernate XML mapping file, you use the entity-name attribute:
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