Chapter 4 Generating Hibernate Persistent Objects and JSF Pages

Defining primary identifier mappings

Primary identifier mapping is mandatory in Hibernate. Primary identifiers of classes are mapped to primary keys of master tables in data sources. If not defined, a default primary identifier mapping will be generated, but this may not work properly.

There are three kinds of primary identifier mapping in Hibernate:

• Simple identifier mapping
• Composite identifier mapping
• Component identifier mapping

Mapped classes must declare the primary key column of the database table. Most classes will also have a Java-Beans-style property holding the unique identifier of an instance.

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