Many To Many Map Cascade Load
/////////////////////////////////////////////////////////////////////////
import java.util.*;
import org.hibernate.*;
import org.hibernate.criterion.*;
public class SimpleRetrieveTest {
public static void main(String[] args) {
HibernateUtil.setup("create table m_EVENTS ( uid int, name VARCHAR, start_Date date, duration int, location_id int);");
HibernateUtil.setup("create table m_speakers ( uid int, firstName VARCHAR, lastName VARCHAR);");
HibernateUtil.setup("create table event_speakers (elt int, event_id int, speaker_id int);");
// hibernate code start
Session session = HibernateUtil.currentSession();
Transaction tx = session.beginTransaction();
EventManyToMany event = new EventManyToMany();
event.setName("Inverse test");
event.setSpeakers(new HashSet());
event.getSpeakers().add(new SpeakerManyToMany("John", "Smith", event));
event.getSpeakers().add(new SpeakerManyToMany("Dave", "Smith", event));
event.getSpeakers().add(new SpeakerManyToMany("Joan", "Smith", event));
session.save(event);
event = (EventManyToMany) session.load(EventManyToMany.class, event.getId());
Set speakers = event.getSpeakers();
for (Iterator i = speakers.iterator(); i.hasNext();) {
SpeakerManyToMany speaker = (SpeakerManyToMany) i.next();
System.out.println(speaker.getFirstName());
System.out.println(speaker.getLastName());
System.out.println(speaker.getId());
}
tx.commit();
HibernateUtil.closeSession();
HibernateUtil.sessionFactory.close();
HibernateUtil.checkData("select * from m_speakers");
HibernateUtil.checkData("select uid, name from m_events");
// hibernate code end
}
}
/////////////////////////////////////////////////////////////////////////
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="SpeakerManyToMany" table="m_speakers">
<id name="id" column="uid" type="long">
<generator class="increment"/>
</id>
<property name="firstName" type="string" length="20"/>
<property name="lastName" type="string" length="20"/>
<set name="events" table="event_speakers" cascade="all">
<key column="speaker_id"/>
<many-to-many class="EventManyToMany"/>
</set>
</class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
import java.util.Set;
import java.util.HashSet;
public class SpeakerManyToMany {
private Long id;
private String firstName;
private String lastName;
private Set events;
public SpeakerManyToMany() {
}
public SpeakerManyToMany(String firstName, String lastName) {
setFirstName(firstName);
setLastName(lastName);
}
public SpeakerManyToMany(String firstName, String lastName, EventManyToMany event) {
this(firstName, lastName);
addEvent(event);
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
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;
}
public Set getEvents() {
return this.events;
}
public void setEvents(Set events) {
this.events = events;
}
private void addEvent(EventManyToMany event) {
if (events == null) {
events = new HashSet();
}
events.add(event);
}
}
/////////////////////////////////////////////////////////////////////////
import java.util.Date;
import java.util.Set;
public class EventManyToMany {
private Long id;
private String name;
private Date startDate;
private int duration;
private Set speakers;
private Set attendees;
private LocationManyToMany location;
public void setId(Long id) {
this.id = id;
}
public Long getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getStartDate() {
return startDate;
}
public void setStartDate(Date startDate) {
this.startDate = startDate;
}
public int getDuration() {
return duration;
}
public void setDuration(int duration) {
this.duration = duration;
}
public LocationManyToMany getLocation() {
return location;
}
public void setLocation(LocationManyToMany location) {
this.location = location;
}
public void setSpeakers(Set speakers) {
this.speakers = speakers;
}
public Set getSpeakers() {
return speakers;
}
public Set getAttendees() {
return attendees;
}
public void setAttendees(Set attendees) {
this.attendees = attendees;
}
}
/////////////////////////////////////////////////////////////////////////
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="EventManyToMany" table="m_events">
<id name="id" column="uid" type="long" unsaved-value="null">
<generator class="increment"/>
</id>
<property name="name" type="string" length="100"/>
<property name="startDate" column="start_date"
type="date"/>
<property name="duration" type="integer"/>
<many-to-one name="location" column="location_id"
class="LocationManyToMany"/>
<set name="speakers" table="event_speakers" cascade="all">
<key column="event_id"/>
<many-to-many class="SpeakerManyToMany"/>
</set>
</class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
<?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">org.hsqldb.jdbcDriver</property>
<property name="connection.url">jdbc:hsqldb:data/tutorial</property>
<property name="connection.username">sa</property>
<property name="connection.password"></property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<mapping resource="EventManyToMany.hbm.xml"/>
<mapping resource="SpeakerManyToMany.hbm.xml"/>
<mapping resource="LocationManyToMany.hbm.xml"/>
</session-factory>
</hibernate-configuration>
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