Generating Hibernate Persistent Objects

Hibernate is an open source project developed by JBoss, which provides a powerful, high performance and transparent object/relational persistence and query solution for Java. PowerDesigner can generate Hibernate O/R mapping files for you from your Java OOM.

To enable Hibernate extensions in your model, select Model > Extensions, click the Attach an Extension tool, select the Hibernate file on the O/R Mapping tab), and click OK to attach it.

Hibernate lets you develop persistent objects using POJO (Plain Old Java Object). All the common Java idioms, including association, inheritance, polymorphism, composition, and the Java collections framework are supported. Hibernate allows you to express queries in its own portable SQL extension (HQL), as well as in native SQL, or with Java-based Criteria and Example objects.

• Defining the Hibernate Default Options
  You can define these options in the model or a package property sheet.
• Defining the Hibernate Database Configuration Parameters
  Hibernate can support multiple databases. You need to define database configuration parameters. The database configuration parameters are stored in the configuration file, hibernate.cfg.xml .
• Defining Hibernate Basic O/R Mappings
  There are two kinds of classes in Hibernate, entity classes and value type classes. Entity classes have their own database identities, mapping files and life cycles, while value type classes don't have. Value type classes depend on entity classes. Value type classes are also called component classes.
• Hibernate Association Mappings
  Hibernate supports one-one, one-to-many/many-to-one, and many-to-many association mappings. The mapping modeling is same with standard O/R Mapping Modeling. However, Hibernate provides special options to define its association mappings, which will be saved into <Class>.hbm.xml mapping file. PowerDesigner allows you to define standard association attributes like Container Type implementation class, role navigability, array size and specific extended attributes for Hibernate association mappings.
• Defining Hibernate Inheritance Mappings
  Hibernate supports the three basic inheritance mapping strategies:
• Generating Code for Hibernate
  Before generating code for Hibernate, you need to:
• Using the Generated Hibernate Code
  To use Eclipse, you need to download and install the Eclipse SDK.