Hibernate One to One Mapping Example

package com.hibernate.venkat;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;

@Entity
public class Person {


private int personId;
private String personName;

private PersonDetail pdetail;

@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.EAGER)
@JoinColumn(name="pdetal_FK")
public PersonDetail getPdetail() {
return pdetail;
}
public void setPdetail(PersonDetail pdetail) {
this.pdetail = pdetail;
}
@Id
@GeneratedValue
public int getPersonId() {
return personId;
}
public void setPersonId(int personId) {
this.personId = personId;
}
public String getPersonName() {
return personName;
}
public void setPersonName(String personName) {
this.personName = personName;
}



}

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package com.hibernate.venkat;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

@Entity

public class PersonDetail {

private int personDetailId;

private String zipcode;

private String job;

private double income;

@Id

@GeneratedValue

@Column(name="detail_pk")

public int getPersonDetailId() {

return personDetailId;

}

public void setPersonDetailId(int personDetailId) {

this.personDetailId = personDetailId;

}

public String getZipcode() {

return zipcode;

}

public void setZipcode(String zipcode) {

this.zipcode = zipcode;

}

public String getJob() {

return job;

}

public void setJob(String job) {

this.job = job;

}

public double getIncome() {

return income;

}

public void setIncome(double income) {

this.income = income;

}

}

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/**

 * 

 */

package com.hibernate.venkat;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;

import org.hibernate.tool.hbm2ddl.SchemaExport;

/**

 * @author Venkat

 *

 */

public class TestPerson {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

AnnotationConfiguration config=new AnnotationConfiguration();

config.addAnnotatedClass(Person.class);

config.addAnnotatedClass(PersonDetail.class);

config.configure();

new SchemaExport(config).create(true, true);

SessionFactory sf= config.buildSessionFactory();

Session s=sf.getCurrentSession();

s.beginTransaction();

PersonDetail pd=new PersonDetail();

pd.setIncome(99756.89);

pd.setJob("Developer");

pd.setZipcode("30328");

Person venkat=new Person();

venkat.setPersonName("Venkat");

venkat.setPdetail(pd);

s.save(venkat);

//s.save(pd); no need if we set cascadetype

s.getTransaction().commit();

}

}

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<?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>

        <!-- Database connection settings -->

        <property name="connection.driver_class">oracle.jdbc.OracleDriver</property>

        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>

        <property name="connection.username">venkat</property>

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

        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size">2</property>

        <!-- SQL dialect -->

        <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>

        <!-- Enable Hibernate's current session context -->

        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->

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

        <!-- Drop and re-create the database schema on startup -->

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

<!--         <mapping resource="org/hibernate/tutorial/domain/Event.hbm.xml"/> -->

<!--         <mapping resource="org/hibernate/tutorial/domain/Person.hbm.xml"/> -->

    </session-factory>

</hibernate-configuration>