EJB Tutorial from JBoss: Primary Key Composition
File: Customer.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.tutorial.composite.bean;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.ManyToMany;
import javax.persistence.Transient;
import javax.persistence.JoinTable;
import javax.persistence.JoinColumn;
/**
*
*/
@Entity
public class Customer implements java.io.Serializable
{
CustomerPK pk;
Set<Flight> flights;
public Customer()
{
}
@EmbeddedId
public CustomerPK getPk()
{
return pk;
}
public void setPk(CustomerPK pk)
{
this.pk = pk;
}
@Transient
public String getName()
{
return pk.getName();
}
@ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, fetch = FetchType.EAGER, mappedBy="customers")
@JoinTable(name="flight_customer_table",
joinColumns = {@JoinColumn(name = "FLIGHT_ID")},
inverseJoinColumns = {@JoinColumn(name = "CUSTOMER_ID"), @JoinColumn(name = "CUSTOMER_NAME")})
public Set<Flight> getFlights()
{
return flights;
}
public void setFlights(Set<Flight> flights)
{
this.flights = flights;
}
}
File: CustomerPK.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.tutorial.composite.bean;
import javax.persistence.Embeddable;
import javax.persistence.Embeddable;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 57207 $
*/
@Embeddable
public class CustomerPK implements java.io.Serializable
{
private long id;
private String name;
public CustomerPK()
{
}
public CustomerPK(long id, String name)
{
this.id = id;
this.name = name;
}
public long getId()
{
return id;
}
public void setId(long id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public int hashCode()
{
return (int) id + name.hashCode();
}
public boolean equals(Object obj)
{
if (obj == this) return true;
if (!(obj instanceof CustomerPK)) return false;
if (obj == null) return false;
CustomerPK pk = (CustomerPK) obj;
return pk.id == id && pk.name.equals(name);
}
}
File: EntityTest.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.tutorial.composite.bean;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 57207 $
*/
public interface EntityTest
{
Flight findFlightById(Long id) throws Exception;
void manyToManyCreate() throws Exception;
}
File: EntityTestBean.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.tutorial.composite.bean;
import java.util.HashSet;
import java.util.Set;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContext;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 57207 $
*/
@Stateless
@Remote(EntityTest.class)
public class EntityTestBean implements EntityTest
{
private @PersistenceContext EntityManager manager;
private static long genid = 0;
public void manyToManyCreate() throws Exception
{
Flight firstOne = new Flight();
firstOne.setId(new Long(1));
firstOne.setName("AF0101");
manager.persist(firstOne);
Flight second = new Flight();
second.setId(new Long(2));
second.setName("US1");
Set<Customer> customers1 = new HashSet<Customer>();
Set<Customer> customers2 = new HashSet<Customer>();
Customer bill = new Customer();
CustomerPK pk = new CustomerPK(genid++, "Bill");
bill.setPk(pk);
customers1.add(bill);
Customer monica = new Customer();
CustomerPK moPK = new CustomerPK(genid++, "Monica");
monica.setPk(moPK);
customers1.add(monica);
Customer molly = new Customer();
CustomerPK mollyPK = new CustomerPK(genid++, "Molly");
molly.setPk(mollyPK);
customers2.add(molly);
firstOne.setCustomers(customers1);
second.setCustomers(customers2);
manager.persist(second);
}
public Flight findFlightById(Long id) throws Exception
{
return manager.find(Flight.class, id);
}
}
File: Flight.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.tutorial.composite.bean;
import java.util.Set;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Transient;
import javax.persistence.Version;
@Entity()
public class Flight implements java.io.Serializable
{
Long id;
String name;
long duration;
long durationInSec;
Integer version;
Set<Customer> customers;
@Id
public Long getId()
{
return id;
}
public void setId(Long long1)
{
id = long1;
}
@Column(updatable = false, name = "flight_name", nullable = false, length = 50)
public String getName()
{
return name;
}
public void setName(String string)
{
name = string;
}
@Basic(fetch = FetchType.LAZY)
public long getDuration()
{
return duration;
}
public void setDuration(long l)
{
duration = l;
//durationInSec = duration / 1000;
}
@Transient
public long getDurationInSec()
{
return durationInSec;
}
public void setDurationInSec(long l)
{
durationInSec = l;
}
@Version
@Column(name = "OPTLOCK")
public Integer getVersion()
{
return version;
}
public void setVersion(Integer i)
{
version = i;
}
@ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, fetch = FetchType.EAGER)
@JoinTable(name = "flight_customer_table",
joinColumns = {@JoinColumn(name = "FLIGHT_ID")},
inverseJoinColumns = {@JoinColumn(name = "CUSTOMER_ID"), @JoinColumn(name = "CUSTOMER_NAME")})
public Set<Customer> getCustomers()
{
return customers;
}
public void setCustomers(Set<Customer> customers)
{
this.customers = customers;
}
}
File: Client.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.tutorial.composite.client;
import org.jboss.tutorial.composite.bean.Customer;
import org.jboss.tutorial.composite.bean.EntityTest;
import org.jboss.tutorial.composite.bean.Flight;
import javax.naming.InitialContext;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 57207 $
*/
public class Client
{
public static void main(String[] args) throws Exception
{
InitialContext ctx = new InitialContext();
EntityTest test = (EntityTest) ctx.lookup("EntityTestBean/remote");
test.manyToManyCreate();
Flight one = test.findFlightById(new Long(1));
Flight two = test.findFlightById(new Long(2));
System.out.println("Air France customers");
for (Customer c : one.getCustomers())
{
System.out.println(c.getName());
}
System.out.println("USAir customers");
for (Customer c : two.getCustomers())
{
System.out.println(c.getName());
}
}
}
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