Running a Hibernate based Application

package dev.regatta.hibernate_example;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.query.Query;

import org.hibernate.cfg.Configuration;

import javax.persistence.*;

import java.util.List;

@Entity

@Table(name = "employees")

public class Employee {

 @Id @Column(name = "employee_key") private int id;

 @Column(name = "employee_name", nullable = false, length = 40)

 private String name;

 @Column(name = "employee_salary") private int salary;

 @Column(name = "employee_department", nullable = false, length = 50)

 private String department;

 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 int getSalary() { return salary; }

 public void setSalary(int salary) { this.salary = salary; }

 public String getDepartment() { return department; }

 public void setDepartment(String department) {

 this.department = department;

 }

}

public class HibernateExample {

 public static void main(String[] args) {

 // Configure Hibernate

 Session session = new Configuration()

 .configure("hibernate.cfg.xml")

 .addAnnotatedClass(Employee.class)

 .buildSessionFactory()

 .openSession();

 Transaction transaction = null;

 try {

 // Start a transaction

 transaction = session.beginTransaction();

 // Create a list of employees

 List<Employee> employees_inserted =

 Arrays.asList(new Employee(1, "John Doe", 10932, "DevOps"),

 new Employee(2, "Richard Roe", 18324, "Legal"),

 new Employee(3, "Jane Roe", 20411, "SoftwareDev"),

 new Employee(4, "Rachel Roe", 19555, "Support"));

 // Persist each employee from the list

 for (Employee employee : employees_inserted) {

 session.persist(employee);

 }

 // Commit the transaction

 transaction.commit();

 // Fetch and display employees

 List<Employee> employees_selected =

 session.createQuery("from Employee", Employee.class).list();

 for (Employee emp : employees_selected) {

 System.out.println("Employee Key: " + emp.getId());

 System.out.println("Employee Name: " + emp.getName());

 System.out.println("Employee Salary: " + emp.getSalary());

 System.out.println("Employee Department: " + emp.getDepartment());

 System.out.println();

 }

 // Delete employees

 transaction = session.beginTransaction();

 for (Employee emp : employees_inserted) {

 m_session.remove(emp);

 }

 transaction.commit();

 } catch (Exception e) {

 if (transaction != null) {

 transaction.rollback();

 }

 e.printStackTrace();

 } finally {

 session.close();

 }

 }

}