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();
}
}
