复习Hibernate(1)

1.首先Hibernate是对数据库进行持久化操作的框剪

 通过简单的代码来复习Hibernate

第一步要搭建环境,此前有一片初识Hibernate的文章,欢迎大家参考,今天,将对数据库持久化的操作进行具体的介绍。

 由于是对数据库进行操作,因此,建一个 JavaProject 测试即可。

①首先建一个 Java 工程

1.建一个单元测试类(HibernateTest.java)

 1 package com.atguigu.hibernate.helloworld;
 2 
 3 import java.sql.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 public class HibernateTest {
14 
15     @Test
16     public void test() {
17         System.out.println("test...");
18         // 1. 创建一个 SessionFactory 对象
19         SessionFactory sessionFactory = null;
20         // 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
21         Configuration configuration = new Configuration().configure();
22         // 4.0 之前这样创建
23         // sessionFactory = configuration.buildSessionFactory();
24 
25         // 2). 创建一个 ServiceRegistry 对象: hibernate 4.x 新添加的对象
26         // hibernate 的任何配置和服务都需要在该对象中注册后才能有效.
27         ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
28                 .applySettings(configuration.getProperties()).build();
29         // 3).
30         sessionFactory = configuration.buildSessionFactory(serviceRegistry);
31 
32         // 2. 创建一个 Session 对象
33         Session session = sessionFactory.openSession();
34 
35         // 3. 开启事务
36         Transaction transaction = session.beginTransaction();
37 
38         // 4. 执行保存操作
39         News news = new News("Java123450", "ATGUIGU0", new Date(
40                 new java.util.Date().getTime()));
41         session.save(news);
42 
43         // 5. 提交事务
44         transaction.commit();
45 
46         // 6. 关闭 Session
47         session.close();
48 
49         // 7. 关闭 SessionFactory 对象
50         sessionFactory.close();
51     }
52 
53 }
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2.建一个JavaBean (News.java) 用于和数据库关联,即所谓的持久化类

  1 package com.atguigu.hibernate.helloworld;
  2 
  3 import java.sql.Blob;
  4 import java.util.Date;
  5 
  6 public class News {
  7     
  8     private Integer id; //field
  9     private String title;
 10     private String author;
 11     
 12     private String desc;
 13     
 14     //使用 title + "," + content 可以来描述当前的 News 记录. 
 15     //即 title + "," + content 可以作为 News 的 desc 属性值
 16     
 17     private String content;
 18     
 19     private Blob picture;
 20     
 21     public Blob getPicture() {
 22         return picture;
 23     }
 24 
 25     public void setPicture(Blob picture) {
 26         this.picture = picture;
 27     }
 28 
 29     public String getContent() {
 30         return content;
 31     }
 32 
 33     public void setContent(String content) {
 34         this.content = content;
 35     }
 36     
 37     public String getDesc() {
 38         return desc;
 39     }
 40 
 41     public void setDesc(String desc) {
 42         this.desc = desc;
 43     }
 44 
 45 
 46 
 47     private Date date;
 48 
 49     public Integer getId() { //property
 50         return id;
 51     }
 52 
 53     public void setId(Integer id) {
 54         this.id = id;
 55     }
 56 
 57     public String getTitle() {
 58         return title;
 59     }
 60 
 61     public void setTitle(String title) {
 62         this.title = title;
 63     }
 64 
 65     public String getAuthor() {
 66         return author;
 67     }
 68 
 69     public void setAuthor(String author) {
 70         this.author = author;
 71     }
 72 
 73     public Date getDate() {
 74         return date;
 75     }
 76 
 77     public void setDate(Date date) {
 78         this.date = date;
 79     }
 80 
 81     public News(String title, String author, Date date) {
 82         super();
 83         this.title = title;
 84         this.author = author;
 85         this.date = date;
 86     }
 87     
 88     public News() {
 89         // TODO Auto-generated constructor stub
 90     }
 91 
 92     @Override
 93     public String toString() {
 94         return "News [id=" + id + ", title=" + title + ", author=" + author
 95                 + ", date=" + date + "]";
 96     }
 97     
 98     
 99     
100 }
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3.借助此前搭建的eclipse插件生成  (News.hbm.xml)

 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 
 5 <hibernate-mapping package="com.atguigu.hibernate.helloworld">
 6 
 7     <class name="News" table="NEWS" dynamic-insert="true">
 8         
 9         <id name="id" type="java.lang.Integer">
10             <column name="ID" />
11             <!-- 指定主键的生成方式, native: 使用数据库本地方式 -->
12             <generator class="native" />
13         </id>
14     
15         <property name="title" not-null="true" unique="true"
16             index="news_index" length="50"
17             type="java.lang.String" column="TITLE" >
18         </property>
19         
20         <property name="author" type="java.lang.String"
21             index="news_index">
22             <column name="AUTHOR" />
23         </property>
24         
25         <property name="date" type="date">
26             <column name="DATE" />
27         </property>
28         
29         <property name="desc" 
30             formula="(SELECT concat(title, ',', author) FROM NEWS n WHERE n.id = id)"></property>
31         
32         <property name="content">
33             <column name="CONTENT" sql-type="text"></column>
34         </property>
35         
36         <property name="picture" column="PICTURE" type="blob"></property>
37         
38     </class>
39     
40 </hibernate-mapping>
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4.Hibernate的配置文件 (hibernate.cfg.xml)

 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 
 5 <hibernate-mapping package="com.atguigu.hibernate.helloworld">
 6 
 7     <class name="News" table="NEWS" dynamic-insert="true">
 8         
 9         <id name="id" type="java.lang.Integer">
10             <column name="ID" />
11             <!-- 指定主键的生成方式, native: 使用数据库本地方式 -->
12             <generator class="native" />
13         </id>
14     
15         <property name="title" not-null="true" unique="true"
16             index="news_index" length="50"
17             type="java.lang.String" column="TITLE" >
18         </property>
19         
20         <property name="author" type="java.lang.String"
21             index="news_index">
22             <column name="AUTHOR" />
23         </property>
24         
25         <property name="date" type="date">
26             <column name="DATE" />
27         </property>
28         
29         <property name="desc" 
30             formula="(SELECT concat(title, ',', author) FROM NEWS n WHERE n.id = id)"></property>
31         
32         <property name="content">
33             <column name="CONTENT" sql-type="text"></column>
34         </property>
35         
36         <property name="picture" column="PICTURE" type="blob"></property>
37         
38     </class>
39     
40 </hibernate-mapping>
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参考目录结构 :

                              Hibernate 简单案例(1)完了    ^_^

                                                 更新中。。。

 

 

   

posted @ 2014-04-07 21:02  天天AC  阅读(162)  评论(0编辑  收藏  举报