Hibernate annoation (Seven inheritance mappings)

Table per Class strategy:the <union-class> element in Hibernate

Single Table/Class hierarchy strategy:the <subclass> element in Hibernate

Joined subclass Strategy:the <joined-subclass> element in Hibernate

EJB supports three kinds of mapping relationships

1, one table per class (Hibertnate <union-class>)

2, one table for each class level (in Hibernate <subclass>)

3, connected subclasses (corresponding to Join-subclass)

Annotations are not currently supported on interfaces

(1) A table for each class:

Set on the parent class Class-level: @Inheritance (Strategy=inheritancetype.table_per_class)

For example:

Java code

Class A code:
@Entity
@Inheritance (Strategy=inheritancetype.table_per_class)
public class A {
　
private int id;
Private String Aname;
@Id
@GeneratedValue (strategy=generationtype.identity)
public int getId () {
return ID;
}
public void setId (int id) {
This.id = ID;
}
Public String Getaname () {
return aname;
}
public void Setaname (String aname) {
This.aname = Aname;
}
　
}
　
Class B extends a code:
@Entity
public class B extends a{
　
Private String bname;
　
Public String Getbname () {
return bname;
}
　
public void Setbname (String bname) {
This.bname = bname;
}
　
}
Class C extends a code:
@Entity
public class C extends a{
　
Private String CNAME;
　
　
Public String Getcname () {
return CNAME;
}
　
public void Setcname (String cname) {
This.cname = CNAME;
}
　
　
}