Composite Primary Keys Using Embeddable In Hibernate | Code Factory

Download code and jars : Link.

File : UserId.java

package com.codeFactory.bean;

import java.io.Serializable;

import javax.persistence.Embeddable;

@Embeddable
public class UserId implements Serializable {

 String firstName;
 String lastName;

 public String getFirstName() {
  return firstName;
 }

 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public String getLastName() {
  return lastName;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

}

File : User.java

package com.codeFactory.bean;

import javax.persistence.AttributeOverride;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;

@Entity
public class User {

 @EmbeddedId
 @AttributeOverride(name = "firstName", column = @Column(name = "fid_firstname"))
 UserId userId;

 Integer age;

 public UserId getUserId() {
  return userId;
 }

 public void setUserId(UserId userId) {
  this.userId = userId;
 }

 public Integer getAge() {
  return age;
 }

 public void setAge(Integer age) {
  this.age = age;
 }

}

File : Action.java

package com.codeFactory.action;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;

import com.codeFactory.bean.User;
import com.codeFactory.bean.UserId;

public class Action {

 static AnnotationConfiguration annotationConfiguration;
 static SessionFactory sessionFactory;

 public static void main(String[] args) {

  annotationConfiguration = new AnnotationConfiguration();
  sessionFactory = annotationConfiguration.configure("hibernate.cfg.xml")
    .buildSessionFactory();

  Session session = sessionFactory.openSession();
  Transaction transaction = null;

  try {
   transaction = session.beginTransaction();
   User user = new User();
   user.setAge(25);

   UserId userId = new UserId();
   userId.setFirstName("first Two");
   userId.setLastName("last");

   user.setUserId(userId);
   session.save(user);
   transaction.commit();
   System.out.println("Saved.");
   session.close();
  } catch (Exception e) {
   System.out.println("Exception : " + e);
  }
 }

}

File : hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC 
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

 <session-factory>
  <property name="hbm2ddl.auto">update</property>
  <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
  <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
  <property name="connection.username">root</property>
  <property name="connection.password">root</property>
  <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
  <mapping class="com.codeFactory.bean.User" />
 </session-factory>

</hibernate-configuration>