Table Per Class Hierarchy in Hibernate ORM

Program 1

package beans;

public class Employee 
{
    private int eid;
    private String ename;
    private int esalary;

    public Employee() {
    }

    public int getEid() {
        return eid;
    }

    public void setEid(int eid) {
        this.eid = eid;
    }

    public String getEname() {
        return ename;
    }

    public void setEname(String ename) {
        this.ename = ename;
    }

    public int getEsalary() {
        return esalary;
    }

    public void setEsalary(int esalary) {
        this.esalary = esalary;
    }
    
}

Program 2

package beans;

public class Manager extends Employee
{
   private int hra;
   private int da;

    public Manager() {
    }

    public int getHra() {
        return hra;
    }

    public void setHra(int hra) {
        this.hra = hra;
    }

    public int getDa() {
        return da;
    }

    public void setDa(int da) {
        this.da = da;
    }
   
}

Program 3

package beans;

public class Clerk extends Employee
{
   int ta;

    public Clerk() {
    }

    public int getTa() {
        return ta;
    }

    public void setTa(int ta) {
        this.ta = ta;
    }
   
}

Program 4

<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="beans.Employee" table="emp" schema="inherit">
        <id name="eid"></id>
        <discriminator column="etype" type="string"></discriminator>
        <property name="ename"></property>
        <property name="esalary"></property>
        <subclass discriminator-value="Mgr" name="beans.Manager">
            <property name="hra"></property>
            <property name="da"></property>
        </subclass>  
        <subclass discriminator-value="Clrk" name="beans.Clerk">
            <property name="ta"></property>
        </subclass> 
    </class>
</hibernate-mapping>

Program 5

<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
   <session-factory>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>  
        <property name="connection.url">jdbc:mysql://localhost/inherit</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root@data</property>
        <property name="connection.pool_size">10</property>
         <property name="hbm2ddl.auto">create</property>
        <property name="show_sql">true</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <mapping resource="resources/Employee.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

Program 6

package view;

import beans.Clerk;
import beans.Manager;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class TestMain 
{
    public static void main(String[] args) 
    {
         Configuration cfg=new Configuration();
         cfg.configure("resources/hibernate.cfg.xml");
         SessionFactory sf=cfg.buildSessionFactory();
         Session session=sf.openSession();
         Manager M=new Manager();
         M.setEid(100);
         M.setEname("Vivek");
         M.setEsalary(8000);
         M.setDa(7000);
         M.setHra(6000);
         
         Clerk C=new Clerk();
         C.setEid(101);
         C.setEname("Rajesh");
         C.setEsalary(7000);
         C.setTa(5000);
         
         Manager M1=new Manager();
         M1.setEid(102);
         M1.setEname("Amit Sharma");
         M1.setEsalary(9000);
         M1.setDa(4000);
         M1.setHra(7000);
         
         session.save(M);
         session.save(M1);
         session.save(C);
         session.beginTransaction().commit();
         session.close();
         sf.close();
         System.out.println("Record Save........");
    }
    
}