Java/EJB3/Entity

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Delete Entity With Ejb

   <source lang="java">

File: EmployeeService.java

import java.util.Collection; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.Query; @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);
   
   em.persist(emp);
   
   emp = findEmployee(id);
   System.out.println(emp);
   em.flush();
   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(){
 }

}


File: EmployeeServiceLocal.java

import java.util.Collection; import javax.ejb.Local; @Local public interface EmployeeServiceLocal {

   public void doAction();
   public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
   public void removeEmployee(int id);
   public Employee raiseEmployeeSalary(int id, long raise) ;
   public Employee findEmployee(int id);
   public Collection<Employee> findAllEmployees() ;

}

File: EmployeeServiceRemote.java


import java.util.Collection; import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote{

 public void doAction();  
 public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
 public void removeEmployee(int id);
 public Employee raiseEmployeeSalary(int id, long raise) ;
 public Employee findEmployee(int id);
 public Collection<Employee> findAllEmployees() ;  

}

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;
 
 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 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.createEmployee(159, "AAA", 45000, "asdf".getBytes());
   Employee emp = service.findEmployee(158);
   System.out.println(emp);
   
   service.removeEmployee(158);
   emp = service.findEmployee(158);
   System.out.println(emp);
 }

}


      </source>