使用hibernate5.2.10编写hibernate helloworld

今天刚开始学习Hibernate，在写 helloworld过程中，通过 Hibernate API 编写访问数据库的代码时出现错误。原因是最新版本5.2.10已经不再使用 ServiceRegistry 来获得 SessionFactory。具体代码：      （oracle数据库）

SessionFactory sessionFactory;
Session session;
Transaction transaction;

//创建 Configuration 对象：对应 hibernate 的基本配置信息和 对象关系映射信息
Configuration configuration = new Configuration().configure();

//5.2.10版本.调用Configuration的buildSessionFactory()方法返回一个SessionFactory对象
sessionFactory = configuration.buildSessionFactory();

//4.x版本. 创建一个 ServiceRegistry 对象: hibernate 4.x 新添加的对象
//hibernate 的任何配置和服务都需要在该对象中注册后才能有效.
//ServiceRegistry serviceRegistry =
//		new ServiceRegistryBuilder().applySettings(configuration.getProperties())
//		                            .buildServiceRegistry();

//sessionFactory = configuration.buildSessionFactory(serviceRegistry);

//从SessionFactory 中获取 Session 对象
session = sessionFactory.openSession();

//开启事务
transaction = session.beginTransaction();

//执行保存操作
News news = new News("Java","LOVEYIYI",new Date(new java.util.Date().getTime()));
session.save(news);

//提交事务
transaction.commit();

//关闭 Session
session.close();

//关闭 SessionFactory
sessionFactory.close();

代码实现后，用JUit4测试会出现 Disabling contextual LOB creation as createClob() method threw error : java.lang 异常，这是因为Hibernate默认获取方式是jdbc，如果使用连接池的方式的话，需要在src下新建一个hibernate.properties，或者在配置文件里，写上一句
 hibernate.temp.use_jdbc_metadata_defaults=false

以下为helloworld全部代码：

News.java

import java.sql.Date;

public class News {

private Integer id;
private String title;
private String author;

private Date datetime;

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 getDatetime() {
return datetime;
}

public void setDatetime(Date datetime) {
this.datetime = datetime;
}

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

public News() {
super();
// TODO Auto-generated constructor stub
}

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

}

hibernate.cfg.xml

<?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>

<!-- 配置连接数据库的基本信息 -->
<property name="connect
95d9
ion.username">scott</property>
<property name="connection.password">tiger</property>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:ORCL</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.Oracle9iDialect</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="hibernate.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/loveyiyi/hibernate/helloworld/News.hbm.xml"/>

</session-factory>

</hibernate-configuration>

News.hbm.xml（本人使用了 hibernate tools，该代码为生成代码）

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-9-12 11:20:46 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
<class name="com.loveyiyi.hibernate.helloworld.News" table="NEWS">

<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" type="java.lang.String">
<column name="TITLE" />
</property>

<property name="author" type="java.lang.String">
<column name="AUTHOR" />
</property>

<property name="datetime" type="java.sql.Date">
<column name="DATETIME" />
</property>

</class>
</hibernate-mapping>

HibernateTest.java

import static org.junit.Assert.*;

import java.sql.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.junit.Test;

public class HibernateTest {

@Test
public void test() {
SessionFactory sessionFactory;
Session session;
Transaction transaction;

//创建 Configuration 对象：对应 hibernate 的基本配置信息和 对象关系映射信息
Configuration configuration = new Configuration().configure();

//调用Configuration的buildSessionFactory()方法返回一个SessionFactory对象
sessionFactory = configuration.buildSessionFactory();

//从SessionFactory 中获取 Session 对象
session = sessionFactory.openSession();

//开启事务
transaction = session.beginTransaction();

//执行保存操作
News news = new News("C#","C++",new Date(new java.util.Date().getTime()));
session.save(news);

//提交事务
transaction.commit();

//关闭 Session
session.close();

//关闭 SessionFactory
sessionFactory.close();
}

}

最后感谢这两位朋友，看了他们的文章和网上各种论坛里的评论我才茅塞顿开
http://blog.csdn.net/bakbeom/article/details/77850909 http://blog.csdn.net/xinteng2012/article/details/38709653