Use PersistenceContext annotation to Link Persistence Context : Persistence « EJB3 « Java
Use PersistenceContext annotation to Link Persistence Context
File: EmployeeService.java
import java.util.Collection;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import javax.transaction.UserTransaction;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService")
EntityManager em;
public EmployeeService() {
}
public Employee createEmployee(int id, String name, long salary, byte[] pic) {
Employee emp = new Employee(id);
emp.setName(name);
emp.setSalary(salary);
emp.setPicture(pic);
em.persist(emp);
emp = findEmployee(id);
System.out.println(emp);
return emp;
}
public void removeEmployee(int id) {
Employee emp = findEmployee(id);
if (emp != null) {
em.remove(emp);
}
}
public Employee raiseEmployeeSalary(int id, long raise) {
Employee emp = em.find(Employee.class, id);
if (emp != null) {
emp.setSalary(emp.getSalary() + raise);
}
return emp;
}
public Employee findEmployee(int id) {
return em.find(Employee.class, id);
}
public Collection<Employee> findAllEmployees() {
Query query = em.createQuery("SELECT e FROM Employee e");
return (Collection<Employee>) query.getResultList();
}
public void doAction(){
Employee emp = new Employee(1);
emp.setName("name");
emp.setSalary(100);
emp.setPicture("pic".getBytes());
em.persist(emp);
emp = findEmployee(1);
System.out.println(emp);
}
}
File: EmployeeServiceLocal.java
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
public void doAction();
public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
public void doAction();
}
File: Employee.java
import static javax.persistence.FetchType.LAZY;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
@Entity
//@Table(name="EMP", schema="HR")
@Table(name="EMP")
public class Employee implements Serializable {
@Id
@Column(name = "EMP_ID")
private int id;
@Column(name = "COMM")
private String name;
@Column(name = "SAL")
private long salary;
@Basic(fetch=LAZY)
@Lob @Column(name="PIC")
private byte[] picture;
public Employee() {
}
public Employee(int id) {
this.id = id;
}
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 long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
public byte[] getPicture() {
return picture;
}
public void setPicture(byte[] picture) {
this.picture = picture;
}
public String toString() {
return "Employee id: " + getId() + " name: " + getName() + " salary: " + getSalary();
}
}
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 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.createEmployee(158, "AAA", 45000, "asdf".getBytes());
service.doAction();
}
}
File: persistence.xml
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence" version="1.0">
<persistence-unit name="EmployeeService" > <!-- transaction-type="JTA" -->
<jta-data-source>java:/DefaultDS</jta-data-source>
<properties>
<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
<property name="hibernate.show_sql" value="true"/>
</properties>
<!--
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
<property name="hibernate.connection.username" value="sa"/>
<property name="hibernate.connection.password" value=""/>
<property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/>
</properties>
-->
</persistence-unit>
</persistence>
EJB-UsePersistenceContextToLinkToPersistenceContext.zip( 4,491 k)