Hibernate HelloWorld

   Hibernate是ORM 框架，采用面向对象的方式来操作关系数据库，消除冗长的 SQL代码。

   使用Hibernate4版本和MySQL数据库做测试

1.导jar包

• antlr-2.7.7.jar
• dom4j-1.6.1.jar
• hibernate-c3p0-4.2.4.Final.jar
• hibernate-commons-annotations-4.0.2.Final.jar
• hibernate-core-4.2.4.Final.jar
• hibernate-jpa-2.0-api-1.0.1.Final.jar
• javassist-3.15.0-GA.jar
• jboss-logging-3.1.0.GA.jar
• jboss-transaction-api_1.1_spec-1.0.1.Final.jar
• mysql-connector-java-5.1.7-bin.jar

2.配置hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
		"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
		"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
    
		<!-- 配置连接数据库的基本信息 -->
		<property name="connection.username">root</property>
		<property name="connection.password">000111</property>
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="connection.url">jdbc:mysql://127.0.0.1:3306/test</property>
		<!-- 配置 hibernate 的基本信息 -->
		<!-- hibernate 所使用的数据库方言 -->
		<property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>	
		<!-- 执行操作时是否在控制台打印 SQL -->
		<property name="show_sql">true</property>
		<!-- 是否对 SQL 进行格式化 -->
		<property name="format_sql">true</property>
		<!-- 指定自动生成数据表的策略 -->
		<property name="hbm2ddl.auto">update</property>
		
		<!-- 指定关联的 .hbm.xml 文件 -->
		<mapping resource="com/demo/hibernate/test/News.hbm.xml"/>
	
	</session-factory>
</hibernate-configuration>

3.编写Bean与映射文件

package com.demo.hibernate.test;

import java.sql.Blob;
import java.util.Date;


public class News {
	
	private Integer id;
	private String title;
	private String author;
	
	private Date date;

	//该属性值为： title: author
	private String desc;
	
	//大文本
	private String content;
	//二进制数据
	private Blob image;
	
	
	
	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

	public Blob getImage() {
		return image;
	}

	public void setImage(Blob image) {
		this.image = image;
	}

	public Integer getId() {
		return id;
	}

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

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}


	public String getDesc() {
		return desc;
	}

	public void setDesc(String desc) {
		this.desc = desc;
	} 

	public News(String title, String author, Date date) {
		super();
		this.title = title;
		this.author = author;
		this.date = date;
	}
	
	public News() {
		 
	}

	@Override
	public String toString() {
		return "News [id=" + id + ", title=" + title + ", author=" + author
				+ ", date=" + date + "]";
	}

}

News.hbm.xml　　

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.demo.hibernate.test">

    <class name="News" table="NEWS" dynamic-insert="true">
    	
        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <!-- 指定主键的生成方式, native: 使用数据库本地方式 -->
            <generator class="native" />
        </id>
    
        <property name="title" not-null="true" unique="true"
        	index="news_index" length="50"
        	type="java.lang.String" column="TITLE" >
        </property>
        
        <property name="author" type="java.lang.String"
        	index="news_index">
            <column name="AUTHOR" />
        </property>
        
        <property name="date" type="date">
            <column name="DATE" />
        </property>
        
        <property name="desc" 
        	formula="(SELECT concat(title, ',', author) FROM NEWS n WHERE n.id = id)"></property>
        	
		<!-- 映射大对象 -->
        <!-- 若希望精确映射 SQL 类型, 可以使用 sql-type 属性. -->
		<property name="content">
			<column name="CONTENT" sql-type="text"></column>
		</property>
		
		<property name="image" column="PICTURE" type="blob"></property>
		
    </class>
    
</hibernate-mapping>

4.测试

package com.demo.hibernate.test;

import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TestNews {
	
	private SessionFactory sessionFactory;
	private Session session;
	private Transaction transaction;

	/**
	 * 测试方法之前执行
	 */
	@Before
	public void init() {
		Configuration configuration = new Configuration().configure();
		ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties())
				.buildServiceRegistry();
		sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
		session = sessionFactory.openSession();
		transaction = session.beginTransaction();
	}

	/**
	 * 测试方法之后执行
	 */
	@After
	public void destroy() {
		transaction.commit();
		session.close();
		sessionFactory.close();
	}
	
	/**
	 * 删除对象记录
	 */
	@Test
	public void testDelete() { 
		News news = (News) session.get(News.class, 1);
		session.delete(news); 
		System.out.println(news);
	}
	
	/**
	 * 修改对象记录
	 */
	@Test
	public void testUpdate() { 
		News news1 = (News) session.get(News.class, 1);
		news1.setContent("test");
		session.update(news1);
	}
	
	/**
	 * 获取对象记录
	 */
	@Test
	public void testGet() {
		News news = (News) session.get(News.class, 1); 
		System.out.println(news);
	}
	
	
	/**
	 * 添加一条记录，主键由数据库负责
	 */
	@Test
	public void testSave() {
		News news = new News();
		news.setTitle("CC");
		news.setAuthor("cc");
		news.setDate(new Date()); 
		System.out.println(news); 
		session.save(news); 
		System.out.println(news); 
	}
}