Working with the table per concrete class strategy of inheritance

This is the easiest strategy among all. In this strategy, hibernate creates a different table for each subclass and parent class. The disadvantage of this approach is that duplicate columns are created in the subclass table.

Getting ready

Consider a new table structure as shown in the following table:

Creating the classes

Update the following code in their respective files:

Source file: Employee.java

@Entity
@Table(name="employee")
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public class Employee {
  
  @Id
  @GeneratedValue(strategy = GenerationType.TABLE)
  @Column(name="id")
  private long id;
  
  @Column(name="name")
  private String name;
  
  //getters and setters
}

Source file: ContractualEmployee.java

@Entity
@AttributeOverrides({
  @AttributeOverride(name="id", column = @Column(name="id")),
  @AttributeOverride(name="name", column = @Column(name="name"))
})
public class ContractualEmployee extends Employee ...