一.Hibernate配置环境搭建

1.导入jar包

包括lib\required 下所有jar包 根目录下hibernate3.jar(核心包)lib/jpa 下的包jdbc数据库包。

2.编写Hibernate.configure.xml配置文件（包括数据库的链接信息和关联映射可以从压缩包中找到）

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3     "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4     "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 5 <hibernate-configuration>
 6     <session-factory>
 7         <property name="dialect"> org.hibernate.dialect.Oracle10gDialect</property>
 8         <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
 9         <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
10         <property name="connection.username">accp</property>
11         <property name="connection.password">accp</property>
12         <property name="show_sql">true</property>
13         <property name="format_sql">true</property>
14         <mapping resource="cn/entity/Emp.hbm.xml" />
15      <mapping resource="cn/entity/Dept.hbm.xml" />
16     </session-factory>
17 </hibernate-configuration>

3.编写实体类(Xx.jar)和实体类映射文件（Xx.hbm.xml）将映射文件在配置文件中注入。

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping package="cn.entity" schema="">
 6     <class name="Emp" table="EMP">
 7             <!--主键-->
 8         <id name="eno" type="java.lang.Integer">
 9             <column name="ENO" length="8" />
10                    <!--主键生成策略必须有-->
11             <generator class="sequence">
12                 <param name="sequence">seq_dept</param>
13             </generator>
14         </id>
15         <property name="ename" type="java.lang.String">
16             <column name="ENAME" length="20" not-null="true" />
17         </property>
18
19     </class>
20 </hibernate-mapping>
21                     

4.编写session工厂来得到session（hibernate的session与servlet不同 ）

 1 package cn.util;
 2
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.cfg.Configuration;
 6
 7 /**
 8  * session工厂
 9  * @author Administrator
10  *
11  */
12 public class Sft {
13 private    static Session session;
14     /**开启会话
15      * @return
16      */
17     public static Session getSession(){
18         Configuration config=new Configuration().configure();
19         SessionFactory session=config.buildSessionFactory().openSession();
20         return session;
21     }
22     public static void closeSession(){
23         if (session!=null) {
24             session.close();
25         }
26
27     }
28 }