Hibernate- 开发环境准备

数据库：两张表，两者通过publisher_id构成关联关系。

Book（图书表）

CREATE TABLE `t_book` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `price` double DEFAULT NULL,
  `publisher_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `FKkp03xwrur02d7x2nxv1hup6x0` (`publisher_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8

Publisher（出版社表）

CREATE TABLE `t_publisher` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8

数据：

/*
SQLyog Ultimate v12.09 (64 bit)
MySQL - 5.5.53 : Database - query
*********************************************************************
*/

/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`query` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `query`;

/*Table structure for table `t_book` */

DROP TABLE IF EXISTS `t_book`;

CREATE TABLE `t_book` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `price` double DEFAULT NULL,
  `publisher_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `FKkp03xwrur02d7x2nxv1hup6x0` (`publisher_id`)
) ENGINE=MyISAM AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;

/*Data for the table `t_book` */

insert  into `t_book`(`id`,`name`,`price`,`publisher_id`) values (1,'云计算技术及性能优化',70,1),(2,'C语言程序设计',31,1),(3,'中国冰雪梦',54,1),(4,'Photoshop图形图像处理',31.84,2),(5,'VisualBasic2015实践教程 ',36,2),(6,'生产微服务 ',44,3),(7,'架构探险：轻量级微服务架构（下册）',63.2,3);

/*Table structure for table `t_publisher` */

DROP TABLE IF EXISTS `t_publisher`;

CREATE TABLE `t_publisher` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

/*Data for the table `t_publisher` */

insert  into `t_publisher`(`id`,`name`) values (1,'电子工业出版社'),(2,'北京大学出版社'),(3,'人民邮电出版社');

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

项目结构以及所使用的包：

实体类，以及映射文件：

Book.java

package com.gordon.domain;

public class Book {

	private Integer id;
	private String name;
	private Double price;

	private Publisher publisher;

	public Integer getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Double getPrice() {
		return price;
	}

	public void setPrice(Double price) {
		this.price = price;
	}

	public Publisher getPublisher() {
		return publisher;
	}

	public void setPublisher(Publisher publisher) {
		this.publisher = publisher;
	}
}

Book.hbm.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="com.gordon.domain.Book" table="t_book">
		<id name="id" column="id">
			<generator class="native" />
		</id>

		<property name="name" column="name" />
		<property name="price" column="price" />

		<many-to-one name="publisher" column="publisher_id" class="com.gordon.domain.Publisher"/>
	</class>
</hibernate-mapping>

Publisher.java

package com.gordon.domain;

import java.util.HashSet;
import java.util.Set;

public class Publisher {

	private Integer id;
	private String name;

	private Set<Book> books = new HashSet<Book>();

	public Integer getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Set<Book> getBooks() {
		return books;
	}

	public void setBooks(Set<Book> books) {
		this.books = books;
	}
}

Publisher.hbm.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="com.gordon.domain.Publisher" table="t_publisher">
		<id name="id" column="id">
			<generator class="native" />
		</id>

		<property name="name" column="name" />

		<set name="books">
			<key column="publisher_id" />
			<one-to-many class="com.gordon.domain.Book" />
		</set>
	</class>
</hibernate-mapping>

hibernate核心配置文件：

<?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/query</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">root</property>

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

		<property name="hibernate.current_session_context_class">thread</property>

		<property name="hbm2ddl.auto">update</property>

		<property name="hibernate.show_sql">true</property>
		<property name="hibernate.format_sql">true</property>

		<mapping resource="com/gordon/domain/Book.hbm.xml"/>
		<mapping resource="com/gordon/domain/Publisher.hbm.xml"/>

	</session-factory>
</hibernate-configuration>

HibernateUtil.java工具类：

package com.gordon.utils;

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

public class HibernateUtil {
	private static final Configuration CONFIGURATION;
	private static final SessionFactory SESSIONFACTORY;

	static {
		CONFIGURATION = new Configuration().configure();
		SESSIONFACTORY = CONFIGURATION.buildSessionFactory();
	};

	public static Session getSession() {
		return SESSIONFACTORY.openSession();
	}

	public static Session getCurrentSession() {
		return SESSIONFACTORY.getCurrentSession();
	}
}

开始测试：使用Junit包进行测试。

package com.gordon.test;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

import com.gordon.utils.HibernateUtil;

public class TestDemo1 {
	@Test
	public void run1() {
		Session session = HibernateUtil.getCurrentSession();
		Transaction transaction = session.beginTransaction();

		transaction.commit();
	}
}