所需jar包（必备包位于lib目录下的required中）
目录结构
1.编写数据库
create table 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));
2.配置数据库文件---hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration> ??<session-factory> ??<property name="hibernate.dialect"> ?????org.hibernate.dialect.MySQLDialect ??</property> ??<property name="hibernate.connection.driver_class"> ?????com.mysql.jdbc.Driver ??</property> ??<!-- Assume test is the database name --> ??<property name="hibernate.connection.url"> ?????jdbc:mysql://localhost:3306/test ??</property> ??<property name="hibernate.connection.username"> ?????root ??</property> ??<property name="hibernate.connection.password"> ????????</property> ??<!-- List of XML mapping files --> ???<mapping resource="com/zhang/entity/Employee.hbm.xml" /></session-factory></hibernate-configuration>
3.创建持久化类---Employee.java
package com.zhang.entity;public class Employee{ ??????private int id; ??????private String firstName; ???????private String lastName; ?????????private int salary; ????????public Employee() {} ??????public Employee(String fname, String lname, int salary) { ?????????this.firstName = fname; ?????????this.lastName = lname; ?????????this.salary = salary; ??????} ??????public int getId() { ?????????return id; ??????} ??????public void setId( int id ) { ?????????this.id = id; ??????} ??????public String getFirstName() { ?????????return firstName; ??????} ??????public void setFirstName( String first_name ) { ?????????this.firstName = first_name; ??????} ??????public String getLastName() { ?????????return lastName; ??????} ??????public void setLastName( String last_name ) { ?????????this.lastName = last_name; ??????} ??????public int getSalary() { ?????????return salary; ??????} ??????public void setSalary( int salary ) { ?????????this.salary = salary; ??????} ???}4.映射文件---Employee.hbm.xml（将已经定义的类或类组与数据库中的表对应起来）
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC ?"-//Hibernate/Hibernate Mapping DTD//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping> ??<class name="com.zhang.entity.Employee" table="EMPLOYEE"> ?????<meta attribute="class-description"> ????????This class contains the employee detail. ??????</meta> ?????<id name="id" type="int" column="id"> ????????<generator class="native"/> ?????</id> ?????<property name="firstName" column="first_name" type="string"/> ?????<property name="lastName" column="last_name" type="string"/> ?????<property name="salary" column="salary" type="int"/> ??</class></hibernate-mapping>
5.工具类---HibernateUtil.java（解析配置文件）
一些固定而且经常使用的步骤我们期望做成一个工具类，以后再需要重复步骤时咱们仅需要引用此工具类就可以，从而避免了一直创建重复代码。比如加载数据库的驱动等，这里Hibernate中我们每个主程序都需要加载hibernate.cfg.xml文件、创建SessionFactory对象、创建Session对象、关闭session。这些都是固定化的步骤，因此我们将它们写在工具类HibernateUtil中，以后咱们直接引用此文件创建各对象即可，大大减少了代码量，提高了代码复用性。
package com.zhang.util;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry; public final class HibernateUtil { ???private HibernateUtil(){ ???????????} ???private static SessionFactory sessionFactory; ???static{ ???????Configuration cfg = new Configuration(); ???????cfg.configure(); ???????ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build(); ???????sessionFactory = cfg.buildSessionFactory(sr); ???} ???public static SessionFactory getSeesionFactory(){ ???????return sessionFactory; ???} ???public static Session getSession(){ ???????return sessionFactory.openSession(); ???} }6.测试类---ManageEmployee.java（与数据库连接）
Session 用于获取与数据库的物理连接。 Session 对象是轻量级的，并且设计为在每次需要与数据库进行交互时被实例化。持久态对象被保存，并通过 Session 对象检索找回。
Session session = factory.openSession();Transaction tx = null;try { ??tx = session.beginTransaction(); ??// do some work ??... ??tx.commit();}catch (Exception e) { ??if (tx!=null) tx.rollback(); ??e.printStackTrace(); }finally { ??session.close();}package com.zhang.test;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;import com.zhang.entity.Employee;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(); ??????} ??}}Hibernate 教程
Hibernate 示例
原文地址：https://www.cnblogs.com/superslow/p/9277877.html