Persistence Context Type: TRANSACTION : Persistence « EJB3 « Java

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Java » EJB3 » PersistenceScreenshots 
Persistence Context Type: TRANSACTION

File: EmployeeService.java


import java.util.Collection;

import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.Query;

@Stateful
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService", type=PersistenceContextType.TRANSACTION)
  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: Main.java

import java.util.Collection;

import javax.naming.InitialContext;
public class Main {

  public static void main(String[] athrows Exception {

    EmployeeServiceRemote service = null;

    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");

    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemotenew 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);
    
    Collection<Employee> list = service.findAllEmployees();
    
    System.out.println(list);
  }

}


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





           
       
EJB-PersistenceContextTypeTRANSACTION.zip( 4,490 k)
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4. Flush Data In EJB
5. Use PersistenceUnit
6. Use PersistenceContext annotation to Link Persistence Context
7. Set Flush Mode
8. Set Column Name For Entity Attribute
9. Retrieve Data From Ejb
10. Persistence Context Type: EXTENDED
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