-

DAT/jpa/src/main/java/entity/User.java

@@ -8,13 +8,16 @@
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
+import javax.persistence.Inheritance;
+import javax.persistence.InheritanceType;
 import javax.persistence.ManyToMany;
 import javax.persistence.TableGenerator;
 import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
 import javax.persistence.Transient;
 
 @Entity
+@Inheritance(strategy=InheritanceType.JOINED)
 public class User implements Serializable {
 
     private static final long serialVersionUID = 1L;

DAT/jpa/src/main/java/entity/UserBasic.java

@@ -0,0 +1,69 @@
+package entity;
+
+import java.io.Serializable;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class UserBasic extends User implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String lastName;
+
+    public String getLastName()
+    {
+        return lastName;
+    }
+
+    public void setLastName(String lastName)
+    {
+        this.lastName = lastName;
+    }
+
+    public Long getId()
+    {
+        return id;
+    }
+
+    public void setId(Long id)
+    {
+        this.id = id;
+    }
+
+    @Override
+    public int hashCode()
+    {
+        int hash = 0;
+        hash += (id != null ? id.hashCode() : 0);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object object)
+    {
+        // TODO: Warning - this method won't work in the case the id fields are not set
+        if (!(object instanceof UserBasic))
+        {
+            return false;
+        }
+        UserBasic other = (UserBasic) object;
+        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id)))
+        {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "entity.UserBasic[ id=" + id + " ]";
+    }
+
+}

DAT/jpa/src/main/java/jpacontrol/Populate.java

@@ -3,6 +3,7 @@
 import entity.Address;
 import entity.Shoe;
 import entity.User;
+import entity.UserBasic;
 import javax.persistence.EntityManager;
 import javax.persistence.EntityManagerFactory;
 import javax.persistence.Persistence;
@@ -46,6 +47,10 @@ public static void main(String[] args)
         em.persist(s1);
         em.persist(s2);
 
+        UserBasic ub = new UserBasic();
+        ub.setLastName("Johnson");
+        em.persist(ub);
+
         em.getTransaction().commit();
 
         em.close();

DAT/jpa/src/main/java/jpacontrol/Populate2.java

@@ -0,0 +1,48 @@
+package jpacontrol;
+
+import entity.Address;
+import entity.Shoe;
+import entity.User;
+import entity.UserBasic;
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+
+public class Populate2
+{
+    public static void main(String[] args)
+    {
+        EntityManagerFactory emf = Persistence.createEntityManagerFactory("jpaPU");
+
+        EntityManager em = emf.createEntityManager();
+
+        em.getTransaction().begin();
+
+        User u = new User();
+        u.setFirstName("William");
+        em.persist(u);
+        u.setFirstName("George");
+        em.persist(u);
+
+        User u1 = new User();
+        u1.setFirstName("John");
+        u1.setId(222l);
+        em.merge(u1);
+        u1.setFirstName("Jack");
+        em.merge(u1);
+
+        User u2 = em.find(User.class, 222l);
+        System.out.println("FUNDET: " + u2.getFirstName());
+        u2.setFirstName("NoName");
+
+        em.merge(u2);
+
+        em.remove(u2);
+
+
+
+        em.getTransaction().commit();
+
+        em.close();
+    }
+}

DAT/jpa/src/main/resources/META-INF/persistence.xml

@@ -6,6 +6,7 @@
     <class>entity.Person</class>
     <class>entity.Address</class>
     <class>entity.Shoe</class>
+    <class>entity.UserBasic</class>
     <properties>
       <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/jpadb"/>
       <property name="javax.persistence.jdbc.user" value="root"/>