Hibernate Many-To-One Mapping Example part -2

Now create the hibernate configuration file and add all the mapping files.

<?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="hibernate.connection.driver_class"> org.hsqldb.jdbcDriver </property>

<property name="hibernate.connection.url"> jdbc:hsqldb:hsql://localhost<;/property>

<property name="hibernate.connection.username">sa</property>

<property name="connection.password"></property>

<property name="connection.pool_size">1</property>

<property name="hibernate.dialect"> org.hibernate.dialect.HSQLDialect </property>

<property name="show_sql">true</property>

<property name="hbm2ddl.auto">create-drop</property>

<mapping resource="com/vaannila/student/Student.hbm.xml"/>

<mapping resource="com/vaannila/student/Address.hbm.xml"/>

</session-factory>

</hibernate-configuration>

After creating the configuration file, generate java class files using Hibernate Tools.(To generate code using Hibernate Tools refer this example )

The following classes will be generated.

package com.vaannila.student;

 

// Generated Sep 3, 2009 7:20:37 PM by Hibernate Tools 3.2.4.GA

 

/**

* This class contains student details.

*/

public class Student implements java.io.Serializable {

 

private long studentId;

private String studentName;

private Address studentAddress;

 

public Student() {

}

 

public Student(String studentName, Address studentAddress) {

this.studentName = studentName;

this.studentAddress = studentAddress;

}

 

public long getStudentId() {

return this.studentId;

}

 

public void setStudentId(long studentId) {

this.studentId = studentId;

}

 

public String getStudentName() {

return this.studentName;

}

 

public void setStudentName(String studentName) {

this.studentName = studentName;

}

 

public Address getStudentAddress() {

return this.studentAddress;

}

 

public void setStudentAddress(Address studentAddress) {

this.studentAddress = studentAddress;

}

 

}

package com.vaannila.student;

 

// Generated Sep 3, 2009 7:20:37 PM by Hibernate Tools 3.2.4.GA

 

/**

* This class contains the student's address

*          details.

*/

public class Address implements java.io.Serializable {

 

private long addressId;

private String street;

private String city;

private String state;

private String zipcode;

 

public Address() {

}

 

public Address(String street, String city, String state, String zipcode) {

this.street = street;

this.city = city;

this.state = state;

this.zipcode = zipcode;

}

 

public long getAddressId() {

return this.addressId;

}

 

public void setAddressId(long addressId) {

this.addressId = addressId;

}

 

public String getStreet() {

return this.street;

}

 

public void setStreet(String street) {

this.street = street;

}

 

public String getCity() {

return this.city;

}

 

public void setCity(String city) {

this.city = city;

}

 

public String getState() {

return this.state;

}

 

public void setState(String state) {

this.state = state;

}

 

public String getZipcode() {

return this.zipcode;

}

 

public void setZipcode(String zipcode) {

this.zipcode = zipcode;

}

 

}

package com.vaannila.student;

 

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.Transaction;

 

import com.vaannila.util.HibernateUtil;

 

public class Main {

 

public static void main(String[] args) {

Session session = HibernateUtil.getSessionFactory().openSession();

Transaction transaction = null;

try {

transaction = session.beginTransaction();

Address address = new Address("OMR Road", "Chennai", "TN","600097");

//By using cascade=all option the address need not be saved explicitly when the student object is persisted the address will be automatically saved.

//session.save(address);

Student student1 = new Student("Eswar", address);

Student student2 = new Student("Joe", address);

session.save(student1);

session.save(student2);

transaction.commit();

} catch (HibernateException e) {

transaction.rollback();

e.printStackTrace();

} finally {

session.close();

}

 

}

 

}