Hibernate学习（二）Hibernate简介：动手搭建简单hibernate项目

什么是Hibernate

Hibernate是一款开源的ORM框架技术
Hibernate对JDBC进行了非常轻量级的对象封装

Hibernate的作用

充当应用程序中的持久化层，用于业务逻辑层通过持久化层对数据库进行数据操作

其他主流的ORM框架技术

1.MyBatis
2.Toplink
3.EJB

第一个Hibernate例子

开发工具：Eclipse（Oxygen.3a Release (4.7.3a)）、Hibernate Tools for Eclipse Plugins

安装Hibernate插件：

1.查看eclipse版本号Help->About Eclipse,我的是Oxygen.3a Release (4.7.3a)

2.找到对应自己版本的JBoss Toolshttps://tools.jboss.org/downloads/overview.html

3.找到对应版本的在线安装地址

4.在线安装插件Help->Install New Software->Add…,将上面的安装地址复制过来，Name写Hibernate

5.选择Hibernate Tools并安装即可

Hibernate入门工程示例：

1.下载所需的jar包
Hibernate核心包、Mysql的jdbc驱动、junit的jar包
2.创建工程，并引入依赖的jar包

3.新建hibernate配置文件

 
  root
  root
  com.mysql.jdbc.Driver
  
  jdbc:mysql:///student?useUnicode=true&characterEncoding=UTF-8
  org.hibernate.dialect.MySQLDialect
  true
  true
  
  update
  
  
 

4.新建持久化对象Student

package net.demo.entity;

public class Student {
	private int sid;
	private int age;
	private String gender;
	private String sname;
	private String address;
	
	public Student() {
	}
	public Student(int sid, int age, String gender, String sname, String address) {
		this.sid = sid;
		this.age = age;
		this.gender = gender;
		this.sname = sname;
		this.address = address;
	}
	public int getSid() {
		return sid;
	}
	public void setSid(int sid) {
		this.sid = sid;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	@Override
	public String toString() {
		return "Student [sid=" + sid + ", age=" + age + ", gender=" + gender + ", sname=" + sname + ", address="
				+ address + "]";
	}
	
}

5.新建对象映射文件Student.hbm.xml，选择要生成映射文件的类可以自动生成，并添加配置

6.使用junit测试

import org.junit.Before;
import org.junit.Test;

import net.demo.entity.Student;

public class HibernateTest {
	private SessionFactory sessionFactory;
	private Session session;
	private Transaction transaction;
	@Before
	public void init() {
//		创建配置对象
		Configuration configuration = new Configuration().configure();
//		创建服务注册对象
		ServiceRegistry serviceRegistry=new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
//		创建会话工厂
		sessionFactory=configuration.buildSessionFactory(serviceRegistry);
//		创建session
		session=sessionFactory.openSession();
//		开启事务
		transaction=session.beginTransaction();
	}
	@Test
	public void testSave() {
		Student student=new Student(1,18,"男","zhangsan","南京");
		session.save(student);
		
	}
	@After
	public void destroy() {
//		提交事务
		transaction.commit();
//		关闭会话
		session.close();
//		关闭会话工厂
		sessionFactory.close();
	}
}

7.运行结果：自动创建了tb_student表，并插入了数据

源码已上传：下载地址https://download.csdn.net/download/sinat_41628872/11710726