Ví dụ Hibernate 4 Annotation Mapping – MySQL

<dependencies>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.3.11.Final</version>
    </dependency>

    <dependency>
        <groupId>javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.12.1.GA</version>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.20</version>
    </dependency>
</dependencies>

create table testdb.EMPLOYEE (
   id INT NOT NULL auto_increment,
   first_name VARCHAR(20) default NULL,
   last_name  VARCHAR(20) default NULL,
   salary     INT  default NULL,
   PRIMARY KEY (id)
);

package com.realtut.entity;

import static javax.persistence.GenerationType.IDENTITY;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * Employee generated by hbm2java
 */
@Entity
@Table(name = "employee")
public class Employee implements java.io.Serializable {
    private Integer id;
    private String firstName;
    private String lastName;
    private Integer salary;

    public Employee() {
    }

    public Employee(String firstName, String lastName, Integer salary) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.salary = salary;
    }

    @Id
    @GeneratedValue(strategy = IDENTITY)

    @Column(name = "id", unique = true, nullable = false)
    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Column(name = "first_name", length = 20)
    public String getFirstName() {
        return this.firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    @Column(name = "last_name", length = 20)
    public String getLastName() {
        return this.lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    @Column(name = "salary")
    public Integer getSalary() {
        return this.salary;
    }

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

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
		"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
		"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">
            com.mysql.jdbc.Driver
        </property>
        <property name="hibernate.connection.url">
            jdbc:mysql://localhost:3306/testdb
        </property>
        <property name="hibernate.connection.username">
            root
        </property>
        <property name="hibernate.connection.password">
            1234567890
        </property>

         
        <property name="connection.pool_size">1</property>
        <property name="hibernate.dialect">
            org.hibernate.dialect.MySQLDialect
        </property>

         
        <property name="show_sql">true</property>

         
        <mapping class="com.realtut.entity.Employee" />
    </session-factory>
</hibernate-configuration>

package com.realtut.utils;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
    public static SessionFactory getSessionFactory() {
        SessionFactory sessionFactory = null;
        try {
            Configuration configuration = new Configuration().configure();
            StandardServiceRegistryBuilder builder 
                = new StandardServiceRegistryBuilder();
            builder.applySettings(configuration.getProperties());
            StandardServiceRegistry serviceRegistry = builder.build();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        } catch (Throwable ex) {
            ex.printStackTrace();
        }
        return sessionFactory;
    }
}

package com.realtut;

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

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

import com.realtut.entity.Employee;
import com.realtut.utils.HibernateUtil;

public class ManageEmployee {
    private static SessionFactory factory;

    public static void main(String[] args) {
        // get session factory
        factory = HibernateUtil.getSessionFactory();

        // create manageEmployee object
        ManageEmployee manageEmployee = new ManageEmployee();

        // Add few employee records in database
        Integer empID1 = manageEmployee.addEmployee("David", "Bishop", 1000);
        Integer empID2 = manageEmployee.addEmployee("Chris", "Ali", 5000);
        Integer empID3 = manageEmployee.addEmployee("John", "Vector", 10000);

        // List down all the employees
        System.out.println("List down all the employees:");
        manageEmployee.listEmployees();

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

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

        // List down new list of the employees
        System.out.println("List down new list of the employees:");
        manageEmployee.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();
        try {
            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());
            }
        } catch (HibernateException e) {
            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();
        }
    }
}