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Alternative entity representation
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only to load, query, or save data in the chosen representation, which is the EntityMode.MAP in the previous example. Note that you can t link a map with a POJO instance; the seller reference has to be a HashMap, not an instance of UserPojo. We mentioned that another good use case for logical entity names is the mapping of one POJO to several tables, so let s look at that. Mapping a class several times Imagine that you have several tables with some columns in common. For example, you could have ITEM_AUCTION and ITEM_SALE tables. Usually you map each table to an entity persistent class, ItemAuction and ItemSale respectively. With the help of entity names, you can save work and implement a single persistent class. To map both tables to a single persistent class, use different entity names (and usually different property mappings):
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<hibernate-mapping> <class name="model.Item" entity-name="ItemAuction" table="ITEM_AUCTION"> <id name="id" column="ITEM_AUCTION_ID">...</id> <property name="description" column="DESCRIPTION"/> <property name="initialPrice" column="INIT_PRICE"/> </class> <class name="model.Item" entity-name="ItemSale" table="ITEM_SALE"> <id name="id" column="ITEM_SALE_ID">...</id> <property name="description" column="DESCRIPTION"/> <property name="salesPrice" column="SALES_PRICE"/> </class> </hibernate-mapping>
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The model.Item persistent class has all the properties you mapped: id, description, initialPrice, and salesPrice. Depending on the entity name you use at runtime, some properties are considered persistent and others transient:
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Item itemForAuction = new Item(); itemForAuction.setDescription("An item for auction"); itemForAuction.setInitialPrice( new BigDecimal(99) ); session.save("ItemAuction", itemForAuction); Item itemForSale = new Item(); itemForSale.setDescription("An item for sale");
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Domain models and metadata
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itemForSale.setSalesPrice( new BigDecimal(123) ); session.save("ItemSale", itemForSale);
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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.
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Representing data in XML
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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:
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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); }
Alternative entity representation
If we assume that you reuse the POJO classes and data from the previous examples, you see one User instance and two Item instances (for clarity, we no longer name them UserPojo and ItemPojo):
<User> <id>1</id> <username>johndoe</username> <itemsForSale> <Item> <id>2</id> <initialPrice>99</initialPrice> <description>An item for auction</description> <seller>1</seller> </Item> <Item> <id>3</id> <initialPrice>123</initialPrice> <description>Another item for auction</description> <seller>1</seller> </Item> </itemsForSale> </User>
Hibernate assumes default XML element names the entity and property names. You can also see that collection elements are embedded, and that circular references are resolved through identifiers (the <seller> element). You can change this default XML representation by adding node attributes to your Hibernate mapping metadata:
<hibernate-mapping> <class name="Item" table="ITEM_ENTITY" node="item"> <id name="id" type="long" column="ITEM_ID" node="@id"> <generator class="native"/> </id> <property name="initialPrice" type="big_decimal" column="INIT_PRICE" node="item-details/@initial-price"/> <property name="description" type="string" column="DESCRIPTION" node="item-details/@description"/> <many-to-one name="seller" class="User" column="USER_ID" embed-xml="false"
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