hibernate的helloworld实现

Posted 2020-06-17

首先要新建一个 web project，然后新建一个lib的文件夹并导入相应的jar包

hibernate开发步骤：

1.创建hibernate配置文件

2.创建持久化类

3.创建对象关系映射文件

如下：

相应的jar包如下：

（jar包去 hibernate文件中找）

hibernate.cfg.xml代码如下：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4         "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 5 <hibernate-configuration>
 6     <session-factory>
 7      <!-- 配置hibernate的基本信息 -->
 8      <property name="connection.username">root</property>
 9      <property name="connection.password">root</property>
10      <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
11      <property name="connection.url">jdbc:mysql:///hibernate1</property>
12      
13      <!-- hibernate的基本配置 -->
14      <!-- 数据库方言 -->
15      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
16 
17      <!-- 是否打印sql -->
18      <property name="show_sql">true</property>
19      <!-- 是否格式化sql -->
20      <property name="format_sql">true</property>
21      <!-- 生成表的策略 -->
22      <property name="hbm2ddl.auto">update</property>
23      
24      
25      
26      <!--需要关联的映射文件-->
27      <mapping  resource="com/nzx/hibernate/News.hbm.xml"/>
28      
29     </session-factory>
30 </hibernate-configuration>

持久化类News代码如下：

 1 package com.nzx.hibernate;
 2 
 3 import java.util.Date;
 4 
 5 /**
 6  * @author zxN
 7  * @version 创建时间：2016年1月3日 下午2:13:57
 8  * 类说明
 9  */
10 class News {
11     private Integer id;
12     private String title;
13     private String author;
14     private Date date;
15     public News() {
16         super();
17         // TODO Auto-generated constructor stub
18     }
19     public News( String title, String author, Date date) {
20         super();
21     
22         this.title = title;
23         this.author = author;
24         this.date = date;
25     }
26     public Integer getId() {
27         return id;
28     }
29     public void setId(Integer id) {
30         this.id = id;
31     }
32     public String getTitle() {
33         return title;
34     }
35     public void setTitle(String title) {
36         this.title = title;
37     }
38     public String getAuthor() {
39         return author;
40     }
41     public void setAuthor(String author) {
42         this.author = author;
43     }
44     public Date getDate() {
45         return date;
46     }
47     public void setDate(Date date) {
48         this.date = date;
49     }
50     @Override
51     public String toString() {
52         return "News [id=" + id + ", title=" + title + ", author=" + author
53                 + ", date=" + date + "]";
54     }
55     
56     
57 }

对象关系映射文件News.hbm.xml代码如下：

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 4 <!-- Generated 2016-2-29 14:33:38 by Hibernate Tools 3.4.0.CR1 -->
 5 <hibernate-mapping>
 6     <class name="com.nzx.hibernate.News" table="NEWS">
 7         <id name="id" type="java.lang.Integer">
 8             <column name="ID" />
 9             <generator class="native" />
10         </id>
11         <property name="title" type="java.lang.String">
12             <column name="TITLE" />
13         </property>
14         <property name="author" type="java.lang.String">
15             <column name="AUTHOR" />
16         </property>
17         <property name="date" type="java.util.Date">
18             <column name="DATE" />
19         </property>
20     </class>
21 </hibernate-mapping>

junit测试类HibernateTest代码如下:

 1 package com.nzx.hibernate;
 2 
 3 import java.util.Date;
 4 
 5 import org.hibernate.Session;
 6 import org.hibernate.SessionFactory;
 7 import org.hibernate.Transaction;
 8 import org.hibernate.cfg.Configuration;
 9 import org.hibernate.service.ServiceRegistry;
10 import org.hibernate.service.ServiceRegistryBuilder;
11 import org.junit.Test;
12 
13 
14 public class HibernateTest {
15 
16     @Test
17     public void test() {
18         //1.创建一个SessionFactory对象
19         SessionFactory sessionFactory = null;
20         
21         //1).创建Configuration对象：对应hibernate的基本配置信息和对象关系映射信息
22         Configuration configuration = new Configuration().configure();
23         //2).创建一个ServiceRigistry对象  hibernate的任何配置和服务都需要在该对象中注册才能生效
24         
25         ServiceRegistry serviceRegistry=
26                  new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
27                         
28         sessionFactory = configuration.buildSessionFactory(serviceRegistry);                
29         //2.创建一个Session对象
30         Session session = sessionFactory.openSession();
31         //3.开启事务
32         Transaction transaction = session.beginTransaction();
33         //4.执行保存操作
34         News news = new News("java","JAVAEE详解",new Date(new java.util.Date().getTime()));
35         session.save(news);
36         //5.提交事务
37         transaction.commit();
38         
39         //6.关闭 session
40         session.close();
41         //7.关闭SessionFactory对象
42         sessionFactory.close();
43         
44         
45     }
46 
47 }

执行test方法，会新建表并出现 插入进的语句

Hibernate:
insert
into
NEWS
(TITLE, AUTHOR, DATE)
values
(?, ?, ?)