cit360.ManageEmployee.java Source code

Introduction

Here is the source code for cit360.ManageEmployee.java

Source

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package cit360;

import java.util.List;
import java.util.Date;
import java.util.Iterator;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class ManageEmployee {
    private static SessionFactory factory;

    public static void main(String[] args) {
        try {
            factory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            System.err.println("Failed to create sessionFactory object." + ex);
            throw new ExceptionInInitializerError(ex);
        }
        ManageEmployee ME = new ManageEmployee();

        /* Add few employee records in database */
        Integer empID1 = ME.addEmployee("Zara", "Ali", 1000);
        Integer empID2 = ME.addEmployee("Daisy", "Das", 5000);
        Integer empID3 = ME.addEmployee("John", "Paul", 10000);

        /* List down all the employees */
        ME.listEmployees();

        /* Update employee's records */
        ME.updateEmployee(empID1, 5000);

        /* Delete an employee from the database */
        ME.deleteEmployee(empID2);

        /* List down new list of the employees */
        ME.listEmployees();
    }

    /* Method to CREATE an employee in the database */
    public Integer addEmployee(String fname, String lname, int salary) {
        Session session = factory.openSession();
        Transaction tx = null;
        Integer employeeID = null;
        try {
            tx = session.beginTransaction();
            Employee employee = new Employee(fname, lname, salary);
            employeeID = (Integer) session.save(employee);
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
        return employeeID;
    }

    /* Method to  READ all the employees */
    public void listEmployees() {
        Session session = factory.openSession();
        Transaction tx = null;
        try {
            tx = session.beginTransaction();
            List employees = session.createQuery("FROM Employee").list();
            for (Iterator iterator = employees.iterator(); iterator.hasNext();) {
                Employee employee = (Employee) iterator.next();
                System.out.print("First Name: " + employee.getFirstName());
                System.out.print("  Last Name: " + employee.getLastName());
                System.out.println("  Salary: " + employee.getSalary());
            }
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
    }

    /* Method to UPDATE salary for an employee */
    public void updateEmployee(Integer EmployeeID, int salary) {
        Session session = factory.openSession();
        Transaction tx = null;
        try {
            tx = session.beginTransaction();
            Employee employee = (Employee) session.get(Employee.class, EmployeeID);
            employee.setSalary(salary);
            session.update(employee);
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
    }

    /* Method to DELETE an employee from the records */
    public void deleteEmployee(Integer EmployeeID) {
        Session session = factory.openSession();
        Transaction tx = null;
        try {
            tx = session.beginTransaction();
            Employee employee = (Employee) session.get(Employee.class, EmployeeID);
            session.delete(employee);
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
    }
}