JLab14 : Table Per Concrete Class Inheritance Mapping

Steps :
1. Create a Java Application with name : JLab14
2. Add JPA Capabilities
3. Copy & Edit Persistence Classes & Util classes from ALab11, as per need.

4. Copy & Edit the Client code from ALab11, as per need.

Follow the directory structure as the following image :

1. Util.java

Same as JPAUtil.java of JLab3

2. A.java

Same as ALab11

3. B.java

Same as ALab11

4. C.java

Same as ALab11

5. D.java

Same as ALab11

6. E.java

Same as ALab11

7. L14.java

package com.persistence;

import javax.persistence.*;

import com.util.Util;

public class L14 {

public static void main(String[] args) {

EntityTransaction tx = null;

try{

EntityManagerFactory sf = Util.getSF();

EntityManager s = sf.createEntityManager();

tx = s.getTransaction();

tx.begin();

A a = new A("A");

B b = new B("B","B");

C c = new C("C","C");

D d = new D("D","D","D");

E e = new E("E","E","E");

s.persist(a);

s.persist(b);

s.persist(c);

s.persist(d);

s.persist(e);

tx.commit();

}catch(Exception e){

e.printStackTrace();

if(tx!=null)

tx.rollback();

}

}

}

8. Table

Same as ALab11

create table a(sid int, sname char(15));

create table b(sid int, sname char(15), bname char(15));

create table c(sid int, sname char(15), cname char(15));

create table d(sid int, sname char(15), bname char(15), dname char(15));

create table e(sid int, sname char(15), bname char(15), ename char(15));

** Run As A Java Application & Choose L14 from list.

** Rows inserted In DB tables as :