JavaPersistenceWithHibernate第二版笔记-第六章-Mapping inheritance-001Hibernate映射继承的方法
2016-04-07 20:34
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There are four different strategies for representing an inheritance hierarchy:
Use one table per concrete class and default runtime polymorphic behavior.
Use one table per concrete class but discard polymorphism and inheritance relationships completely from the SQL schema. Use SQL UNION queries for runtime polymorphic behavior.
Use one table per class hierarchy: enable polymorphism by denormalizing the SQL schema and relying on row-based discrimination to determine super/subtypes.
Use one table per subclass: represent is a (inheritance) relationships as has a (foreign key) relationships, and use SQL JOIN operations.
Use one table per concrete class and default runtime polymorphic behavior.
Use one table per concrete class but discard polymorphism and inheritance relationships completely from the SQL schema. Use SQL UNION queries for runtime polymorphic behavior.
Use one table per class hierarchy: enable polymorphism by denormalizing the SQL schema and relying on row-based discrimination to determine super/subtypes.
Use one table per subclass: represent is a (inheritance) relationships as has a (foreign key) relationships, and use SQL JOIN operations.
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