Types of inheritence models in Hibernate
By: Emiley J. in Hibernate Tutorials on 2008-09-02
This tutorial discusses what are the types of inheritance models in Hibernate and describes how they work like vertical inheritance and horizontal.
There are three types of inheritance mapping in hibernate
1. Table per concrete class with unions
2. Table per class hierarchy
3. Table per subclass
Example:
Let us take the simple example of 3 java classes.
Class Manager and Worker are inherited from Employee Abstract class.
1. Table per concrete class with unions
In this case there will be 2 tables
Tables: Manager, Worker [all common attributes will be duplicated]
2. Table per class hierarchy
Single Table can be mapped to a class hierarchy
There will be only one table in database called 'Employee' that will
represent all the attributes required for all 3 classes.
But it needs some discriminating column to differentiate between Manager and
worker;
3. Table per subclass
In this case there will be 3 tables represent Employee, Manager and Worker
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