Composite Primary Keys In Hibernate | Code Factory

Download code and jars : Link.

File : ProjectId.java

package com.codeFactory.bean;

import java.io.Serializable;

public class ProjectId implements Serializable{

int departmentId;
int projectId;

public int getDepartmentId() {
return departmentId;
}
public void setDepartmentId(int departmentId) {
this.departmentId = departmentId;
}
public int getProjectId() {
return projectId;
}
public void setProjectId(int projectId) {
this.projectId = projectId;
}

}

File : Project.java

package com.codeFactory.bean;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.IdClass;

@Entity

@IdClass(ProjectId.class)

public class Project {

@Id int departmentId;

@Id int projectId;

public int getDepartmentId() {

return departmentId;

}

public void setDepartmentId(int departmentId) {

this.departmentId = departmentId;

}

public int getProjectId() {

return projectId;

}

public void setProjectId(int projectId) {

this.projectId = projectId;

}

}

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.Project;

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();

Project project = new Project();

project.setProjectId(1);

project.setDepartmentId(2);

session.save(project);

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.Project"/>

</session-factory>

</hibernate-configuration>