orm环境创建及demo

 1 package hib;
 2 
 3 public class News {
 4     public int getId() {
 5         return id;
 6     }
 7     public void setId(int id) {
 8         this.id = id;
 9     }
10     public String getTitle() {
11         return title;
12     }
13     public void setTitle(String title) {
14         this.title = title;
15     }
16     public String getContent() {
17         return content;
18     }
19     public void setContent(String content) {
20         this.content = content;
21     }
22     private int id;
23     private String title;
24     private String content;
25     
26 }

 1 <?xml version="1.0"  encoding="UTF-8"?>    
 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="hib">
 6     <class name="News" table="news_table">
 7         <id name="id" column="id">
 8             <generator class="identity" />
 9         </id>
10         <property name="title" type="string" column="title" />
11         <property name="content" type="string" column="content" />
12     </class>
13 </hibernate-mapping>

 1 <?xml version="1.0" encoding="UTF-8"?>  
 2 <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"  
 3                                          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">  
 4 
 5 <hibernate-configuration>
 6     <session-factory>
 7     
 8         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
 9         <property name="connection.url">jdbc:mysql://127.0.0.1:3306/think_blog?useUnicode=true&amp;characterEncoding=UTF-8</property> <!-- 指定字符集的方式-->
10         <property name="connection.username">root</property>
11         <property name="connection.password"></property> 
12 
13         <property name="hibernate.c3p0.max_size">20</property>
14         <property name="hibernate.c3p0.min_size">1</property>
15     
16         <property name="hibernate.c3p0.timeout">5000</property>
17     
18         <property name="hibernate.c3p0.max_statements">100</property>
19         <property name="hibernate.c3p0.idle_test_period">3000</property>
20         <property name="hibernate.c3p0.acquire_increment">2</property>
21         <property name="hibernate.c3p0.validate">true</property>
22         <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!--数据库方言-->
23     　　<!--自动建表及打印sql -->
24         <property name="hbm2ddl.auto">update</property>
25         <property name="show_sql">true</property>
26         <mapping resource="hib/News.hbm.xml" />
27     </session-factory>
28 </hibernate-configuration>

 1 package hib;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.Transaction;
 6 import org.hibernate.cfg.Configuration;
 7 
 8 public class NewsManager {
 9     public static void main(String[] args) {
10         //实例化Configuration
11         //configure()方法默认加载  /hibernate.cfg.xml
12         Configuration conf = new Configuration().configure();
13         //用Configuration创建SessionFactory
14         SessionFactory sf = conf.buildSessionFactory();
15         //用SessionFactory打开Session
16         Session sess = sf.openSession();
17         //开始事务
18         Transaction tx = sess.beginTransaction();
19         //创建消息实例
20         News n = new News();
21         //设置消息标题和消息内容
22         n.setTitle("天王盖地虎");
23         n.setContent("宝塔镇河妖");
24         //保存消息
25         sess.save(n);
26         //提交事务
27         tx.commit();
28         //关闭session 和 SessionFactory
29         sess.close();
30         sf.close();    
31         System.out.println("执行完毕");
32     }
33 }