Top web site - CHAPTER 3 Domain models and metadata itemForSale.setSalesPrice( new
CHAPTER 3 Domain models and metadata itemForSale.setSalesPrice( new BigDecimal(123) ); session.save(”ItemSale”, itemForSale); Thanks to the logical entity name, Hibernate knows into which table it should insert the data. Depending on the entity name you use for loading and querying entities, Hibernate selects from the appropriate table. Scenarios in which you need this functionality are rare, and you ll probably agree with us that the previous use case isn t good or common. In the next section, we introduce the third built-in Hibernate entity mode, the representation of domain entities as XML documents. 3.4.2 Representing data in XML XML is nothing but a text file format; it has no inherent capabilities that qualify it as a medium for data storage or data management. The XML data model is weak, its type system is complex and underpowered, its data integrity is almost completely procedural, and it introduces hierarchical data structures that were outdated decades ago. However, data in XML format is attractive to work with in Java; we have nice tools. For example, we can transform XML data with XSLT, which we consider one of the best use cases. Hibernate has no built-in functionality to store data in an XML format; it relies on a relational representation and SQL, and the benefits of this strategy should be clear. On the other hand, Hibernate can load and present data to the application developer in an XML format. This allows you to use a sophisticated set of tools without any additional transformation steps. Let s assume that you work in default POJO mode and that you quickly want to obtain some data represented in XML. Open a temporary Session with the EntityMode.DOM4J: Session dom4jSession = session.getSession(EntityMode.DOM4J); Element userXML = (Element) dom4jSession.load(User.class, storedUserId); What is returned here is a dom4j Element, and you can use the dom4j API to read and manipulate it. For example, you can pretty-print it to your console with the following snippet: try { OutputFormat format = OutputFormat.createPrettyPrint(); XMLWriter writer = new XMLWriter( System.out, format); writer.write( userXML ); } catch (IOException ex) { throw new RuntimeException(ex); }
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