Java/EJB3/Entity Inheritance
Версия от 18:01, 31 мая 2010; (обсуждение)
EJB Tutorial from JBoss: join inheritance
File: Cat.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.joininheritance.bean;
import javax.persistence.Entity;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Cat extends Pet
{
int lives;
public int getLives()
{
return lives;
}
public void setLives(int lives)
{
this.lives = lives;
}
}
File: Dog.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.joininheritance.bean;
import javax.persistence.Entity;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Entity;
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Dog extends Pet
{
private int numBones;
public int getNumBones()
{
return numBones;
}
public void setNumBones(int numBones)
{
this.numBones = numBones;
}
}
File: Pet.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.joininheritance.bean;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue; import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.GeneratedValue; import javax.persistence.GenerationType;
import javax.persistence.InheritanceType;
import javax.persistence.Entity;
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Pet implements java.io.Serializable
{
private int id;
private String name;
private double weight;
@Id @GeneratedValue(strategy=GenerationType.AUTO)
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public double getWeight()
{
return weight;
}
public void setWeight(double weight)
{
this.weight = weight;
}
}
File: PetDAO.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.joininheritance.bean;
import java.util.List;
public interface PetDAO
{
void createDog(String name, double weight, int bones);
void createCat(String name, double weight, int lives);
List findByWeight(double weight);
}
File: PetDAOBean.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.joininheritance.bean;
import java.util.List;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContext;
@Stateless
@Remote(PetDAO.class)
public class PetDAOBean implements PetDAO
{
@PersistenceContext
private EntityManager manager;
public void createDog(String name, double weight, int bones)
{
Dog dog = new Dog();
dog.setName(name);
dog.setWeight(weight);
dog.setNumBones(bones);
manager.persist(dog);
}
public void createCat(String name, double weight, int lives)
{
Cat cat = new Cat();
cat.setName(name);
cat.setWeight(weight);
cat.setLives(lives);
manager.persist(cat);
}
public List findByWeight(double weight)
{
return manager.createQuery("select p from Pet p where p.weight < :weight").setParameter("weight", weight).getResultList();
}
}
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.joininheritance.Client;
import org.jboss.tutorial.joininheritance.bean.Pet;
import org.jboss.tutorial.joininheritance.bean.PetDAO;
import javax.naming.InitialContext;
import java.util.List;
/**
* Comment
*
* @author
== EJB Tutorial from JBoss: single inheritance ==
<!-- start source code -->
<source lang="java">
File: Cat.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.singleinheritance.bean;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorValue;
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(discriminatorType = DiscriminatorType.STRING)
@DiscriminatorValue("CAT")
public class Cat extends Pet
{
public String getHairball()
{
return hairball;
}
public void setHairball(String hairball)
{
this.hairball = hairball;
}
String hairball;
}
File: Dog.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.singleinheritance.bean;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorValue;
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(discriminatorType = DiscriminatorType.STRING)
@DiscriminatorValue("DOG")
public class Dog extends Pet
{
private String trick;
public String getTrick()
{
return trick;
}
public void setTrick(String trick)
{
this.trick = trick;
}
}
File: Pet.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.singleinheritance.bean;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "ANIMAL_TYPE", discriminatorType = DiscriminatorType.STRING)
public class Pet implements java.io.Serializable
{
private int id;
private String name;
private double weight;
@Id @GeneratedValue(strategy=GenerationType.AUTO)
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public double getWeight()
{
return weight;
}
public void setWeight(double weight)
{
this.weight = weight;
}
}
File: PetDAO.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.singleinheritance.bean;
import java.util.List;
public interface PetDAO
{
void createDog(String name, double weight, int bones);
void createCat(String name, double weight, int lives);
List findByWeight(double weight);
}
File: PetDAOBean.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.singleinheritance.bean;
import java.util.List;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless
@Remote(PetDAO.class)
public class PetDAOBean implements PetDAO
{
@PersistenceContext
private EntityManager manager;
public void createDog(String name, double weight, int bones)
{
Dog dog = new Dog();
dog.setName(name);
dog.setWeight(weight);
dog.setTrick("Sit");
manager.persist(dog);
}
public void createCat(String name, double weight, int lives)
{
Cat cat = new Cat();
cat.setName(name);
cat.setWeight(weight);
cat.setHairball("#$@#%@");
manager.persist(cat);
}
public List findByWeight(double weight)
{
return manager.createQuery("select p from Pet p where p.weight < :weight").setParameter("weight", weight).getResultList();
}
}
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.singleinheritance.Client;
import org.jboss.tutorial.singleinheritance.bean.Pet;
import org.jboss.tutorial.singleinheritance.bean.PetDAO;
import javax.naming.InitialContext;
import java.util.List;
/**
* Comment
*
* @author
== Hierarchical entities ==
<!-- start source code -->
<source lang="java">
File: Employee.java
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
@Entity
public class Employee extends Customer {
private int employeeId;
public int getEmployeeId() { return employeeId; }
public void setEmployeeId(int id) { employeeId = id; }
}
@Entity
@DiscriminatorValue("CUST")
class Customer extends Person {
private String street;
private String city;
private String state;
private String zip;
public String getStreet() { return street; }
public void setStreet(String street) { this.street = street; }
public String getCity() { return city; }
public void setCity(String city) { this.city = city; }
public String getState() { return state; }
public void setState(String state) { this.state = state; }
public String getZip() { return zip; }
public void setZip(String zip) { this.zip = zip; }
}
@Entity
@Table(name="PERSON_HIERARCHY")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="DISCRIMINATOR",
discriminatorType=DiscriminatorType.STRING)
@DiscriminatorValue("PERSON")
class Person implements java.io.Serializable
{
private int id;
private String firstName;
private String lastName;
@Id @GeneratedValue
public int getId() { return id; }
public void setId(int id) { this.id = id; }
public String getFirstName() { return firstName; }
public void setFirstName(String first) { this.firstName = first; }
public String getLastName() { return lastName; }
public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeService.java
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService")
EntityManager em;
public EmployeeService() {
}
public void doAction(){
Person p = new Person();
p.setFirstName("P");
p.setLastName("P");
em.persist(p);
Customer cust = new Customer();
cust.setFirstName("C");
cust.setLastName("C");
cust.setStreet("Street");
cust.setCity("City");
cust.setState("State");
cust.setZip("11111");
em.persist(cust);
Employee employee = new Employee();
employee.setFirstName("E");
employee.setLastName("E");
employee.setStreet("1st Street");
employee.setCity("E City");
employee.setState("E State");
employee.setZip("33333");
employee.setEmployeeId(15);
em.persist(employee);
em.flush();
System.out.println("saved");
}
}
File: EmployeeServiceLocal.java
import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public void doAction();
}
File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099
File: Main.java
import java.util.Collection;
import javax.naming.InitialContext;
public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");
service.doAction();
}
}
Inheritance Type: SINGLE_TABLE
File: Employee.java
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
@Entity
public class Employee extends Customer {
private int employeeId;
public int getEmployeeId() { return employeeId; }
public void setEmployeeId(int id) { employeeId = id; }
}
@Entity
@DiscriminatorValue("CUST")
class Customer extends Person {
private String street;
private String city;
private String state;
private String zip;
public String getStreet() { return street; }
public void setStreet(String street) { this.street = street; }
public String getCity() { return city; }
public void setCity(String city) { this.city = city; }
public String getState() { return state; }
public void setState(String state) { this.state = state; }
public String getZip() { return zip; }
public void setZip(String zip) { this.zip = zip; }
}
@Entity
@Table(name="PERSON_HIERARCHY")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="DISCRIMINATOR",
discriminatorType=DiscriminatorType.STRING)
@DiscriminatorValue("PERSON")
class Person implements java.io.Serializable
{
private int id;
private String firstName;
private String lastName;
@Id @GeneratedValue
public int getId() { return id; }
public void setId(int id) { this.id = id; }
public String getFirstName() { return firstName; }
public void setFirstName(String first) { this.firstName = first; }
public String getLastName() { return lastName; }
public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeService.java
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService")
EntityManager em;
public EmployeeService() {
}
public void doAction(){
Person p = new Person();
p.setFirstName("P");
p.setLastName("P");
em.persist(p);
Customer cust = new Customer();
cust.setFirstName("C");
cust.setLastName("C");
cust.setStreet("Street");
cust.setCity("City");
cust.setState("State");
cust.setZip("11111");
em.persist(cust);
Employee employee = new Employee();
employee.setFirstName("E");
employee.setLastName("E");
employee.setStreet("1st Street");
employee.setCity("E City");
employee.setState("E State");
employee.setZip("33333");
employee.setEmployeeId(15);
em.persist(employee);
em.flush();
System.out.println("saved");
}
}
File: EmployeeServiceLocal.java
import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public void doAction();
}
File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099
File: Main.java
import java.util.Collection;
import javax.naming.InitialContext;
public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");
service.doAction();
}
}
Retrieve Hierarchical Entities
File: Employee.java
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
@Entity
public class Employee extends Customer {
private int employeeId;
public int getEmployeeId() { return employeeId; }
public void setEmployeeId(int id) { employeeId = id; }
}
@Entity
@DiscriminatorValue("CUST")
class Customer extends Person {
private String street;
private String city;
private String state;
private String zip;
public String getStreet() { return street; }
public void setStreet(String street) { this.street = street; }
public String getCity() { return city; }
public void setCity(String city) { this.city = city; }
public String getState() { return state; }
public void setState(String state) { this.state = state; }
public String getZip() { return zip; }
public void setZip(String zip) { this.zip = zip; }
}
@Entity
@Table(name="PERSON_HIERARCHY")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="DISCRIMINATOR",
discriminatorType=DiscriminatorType.STRING)
@DiscriminatorValue("PERSON")
class Person implements java.io.Serializable
{
private int id;
private String firstName;
private String lastName;
@Id @GeneratedValue
public int getId() { return id; }
public void setId(int id) { this.id = id; }
public String getFirstName() { return firstName; }
public void setFirstName(String first) { this.firstName = first; }
public String getLastName() { return lastName; }
public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeService.java
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService")
EntityManager em;
public EmployeeService() {
}
public void doAction(){
Person p = new Person();
p.setFirstName("P");
p.setLastName("P");
em.persist(p);
Customer cust = new Customer();
cust.setFirstName("C");
cust.setLastName("C");
cust.setStreet("Street");
cust.setCity("City");
cust.setState("State");
cust.setZip("11111");
em.persist(cust);
Employee employee = new Employee();
employee.setFirstName("E");
employee.setLastName("E");
employee.setStreet("1st Street");
employee.setCity("E City");
employee.setState("E State");
employee.setZip("33333");
employee.setEmployeeId(15);
em.persist(employee);
em.flush();
System.out.println("saved");
List list = em.createQuery("FROM Person p").getResultList();
}
}
File: EmployeeServiceLocal.java
import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public void doAction();
}
File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099
File: Main.java
import java.util.Collection;
import javax.naming.InitialContext;
public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");
service.doAction();
}
}
