Hibernate Inheritance Mapping Tutorial
We can map the inheritance hierarchy classes with the table of the database. There are three inheritance mapping strategies defined in the hibernate:
- Table Per Hierarchy
Table Per Hierarchy
In table per hierarchy mapping, single table is required to map the whole hierarchy, an extra column (known as discriminator column) is added to identify the class. But nullable values are stored in the table .
Table Per Concrete class
In case of table per concrete class, tables are created as per class. But duplicate column is added in subclass tables.
Table Per Subclass
In this strategy, tables are created as per class but related by foreign key. So there are no duplicate columns.