1 package com.iqjava.employee;
  2 
  3 import org.hibernate.HibernateException;
  4 import org.hibernate.Session;
  5 import org.hibernate.Transaction;
  6 import java.util.List;
  7 import java.util.Iterator;
  8 import com.iqjava.util.HibernateUtil;
  9 
 10 public class ExecutionClass {
 11 
 12     public static void main(String[] args) {
 13         
 14         ExecutionClass obj = new ExecutionClass();
 15         Long empId1 = obj.saveEmployee("John");
 16         Long empId2 = obj.saveEmployee("Paul");
 17         Long empId3 = obj.saveEmployee("Bill");
 18         obj.listEmployee();
 19         System.out.println("Updating emp3....");
 20         obj.updateEmployee(empId3, "Michael");
 21         System.out.println("Deleting emp2....");
 22         obj.deleteEmployee(empId2);
 23         System.out.println("List employees....");
 24         obj.listEmployee();
 25     }
 26     
 27     public Long saveEmployee(String employeeName)
 28     {
 29         Session session = HibernateUtil.getSessionFactory().openSession();
 30         Transaction transaction = null;
 31         Long empId = null;
 32         try {
 33             transaction = session.beginTransaction();
 34             Employee emp = new Employee();
 35             emp.setEmployeeName(employeeName);
 36             empId = (Long) session.save(emp);
 37             transaction.commit();
 38         } catch (HibernateException e) {
 39             transaction.rollback();
 40             e.printStackTrace();
 41         } finally {
 42             session.close();
 43         }
 44         return empId;
 45     }
 46     
 47     public void listEmployee()
 48     {
 49         Session session = HibernateUtil.getSessionFactory().openSession();
 50         Transaction transaction = null;
 51         try {
 52             transaction = session.beginTransaction();
 53             List emps = session.createQuery("from Employee").list();
 54             for (Iterator iterator = emps.iterator(); iterator.hasNext();)
 55             {
 56                 Employee emp = (Employee) iterator.next();
 57                 System.out.println(emp.getEmployeeName());
 58             }
 59             transaction.commit();
 60         } catch (HibernateException e) {
 61             transaction.rollback();
 62             e.printStackTrace();
 63         } finally {
 64             session.close();
 65         }
 66     }
 67     
 68     public void updateEmployee(Long empId, String employeeName)
 69     {
 70         Session session = HibernateUtil.getSessionFactory().openSession();
 71         Transaction transaction = null;
 72         try {
 73             transaction = session.beginTransaction();
 74             Employee emp = (Employee) session.get(Employee.class, empId);
 75             emp.setEmployeeName(employeeName);
 76             transaction.commit();
 77         } catch (HibernateException e) {
 78             transaction.rollback();
 79             e.printStackTrace();
 80         } finally {
 81             session.close();
 82         }
 83     }
 84     
 85     public void deleteEmployee(Long empId)
 86     {
 87         Session session = HibernateUtil.getSessionFactory().openSession();
 88         Transaction transaction = null;
 89         try {
 90             transaction = session.beginTransaction();
 91             Employee emp = (Employee) session.get(Employee.class, empId);
 92             session.delete(emp);
 93             transaction.commit();
 94         } catch (HibernateException e) {
 95             transaction.rollback();
 96             e.printStackTrace();
 97         } finally {
 98             session.close();
 99         }
100     }
101 
102 }
103 
104