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Object/relational mapping metadata
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should be reserved for a particular class of fully dynamic applications, or application building kits. The following code adds a new property, motto, to the User class:
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// Get the existing mapping for User from Configuration PersistentClass userMapping = cfg.getClassMapping(User.class.getName()); // Define a new column for the USER table Column column = new Column(); column.setName("MOTTO"); column.setNullable(false); column.setUnique(true); userMapping.getTable().addColumn(column); // Wrap the column in a Value SimpleValue value = new SimpleValue(); value.setTable( userMapping.getTable() ); value.setTypeName("string"); value.addColumn(column); // Define a new property of the User class Property prop = new Property(); prop.setValue(value); prop.setName("motto"); prop.setNodeName(prop.getName()); userMapping.addProperty(prop); // Build a new session factory, using the new mapping SessionFactory sf = cfg.buildSessionFactory();
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A PersistentClass object represents the metamodel for a single persistent class, and you retrieve it from the Configuration object. Column, SimpleValue, and Property are all classes of the Hibernate metamodel and are available in the org.hibernate.mapping package.
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Keep in mind that adding a property to an existing persistent class mapping, as shown here, is quite easy, but programmatically creating a new mapping for a previously unmapped class is more involved.
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Once a SessionFactory is created, its mappings are immutable. The SessionFactory uses a different metamodel internally than the one used at configuration time. There is no way to get back to the original Configuration from the SessionFactory or Session. (Note that you can get the SessionFactory from a Session if you wish to access a global setting.) However, the application can read the SessionFactory s metamodel by calling getClassMetadata() or getCollectionMetadata(). Here s an example:
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Domain models and metadata
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Item item = ...; ClassMetadata meta = sessionFactory.getClassMetadata(Item.class); String[] metaPropertyNames = meta.getPropertyNames(); Object[] propertyValues = meta.getPropertyValues(item, EntityMode.POJO);
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This code snippet retrieves the names of persistent properties of the Item class and the values of those properties for a particular instance. This helps you write generic code. For example, you may use this feature to label UI components or improve log output. Although you ve seen some mapping constructs in the previous sections, we haven t introduced any more sophisticated class and property mappings so far. You should now decide which mapping metadata option you d like to use in your project and then read more about class and property mappings in the next chapter. Or, if you re already an experienced Hibernate user, you can read on and find out how the latest Hibernate version allows you to represent a domain model without Java classes.
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Alternative entity representation
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In this book, so far, we ve always talked about a domain model implementation based on Java classes we called them POJOs, persistent classes, JavaBeans, or entities. An implementation of a domain model that is based on Java classes with regular properties, collections, and so on, is type-safe. If you access a property of a class, your IDE offers autocompletion based on the strong types of your model, and the compiler checks whether your source is correct. However, you pay for this safety with more time spent on the domain model implementation and time is money. In the following sections, we introduce Hibernate s ability to work with domain models that aren t implemented with Java classes. We re basically trading typesafety for other benefits and, because nothing is free, more errors at runtime whenever we make a mistake. In Hibernate, you can select an entity mode for your application, or even mix entity modes for a single model. You can even switch between entity modes in a single Session. These are the three built-in entity modes in Hibernate:
POJO A domain model implementation based on POJOs, persistent classes.
This is what you have seen so far, and it s the default entity mode.
Alternative 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.
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