一.Hibernate配置环境搭建

1.导入jar包

包括lib equired 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）

<?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>
        <property name="dialect"> org.hibernate.dialect.Oracle10gDialect</property>
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
        <property name="connection.username">accp</property>
        <property name="connection.password">accp</property>
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <mapping resource="cn/entity/Emp.hbm.xml" />
     <mapping resource="cn/entity/Dept.hbm.xml" />    
    </session-factory>
</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。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.entity" schema="">
    <class name="Emp" table="EMP">
            <!--主键-->
        <id name="eno" type="java.lang.Integer">
            <column name="ENO" length="8" />
                   <!--主键生成策略必须有-->
            <generator class="sequence">
                <param name="sequence">seq_dept</param>
            </generator>
        </id>
        <property name="ename" type="java.lang.String">
            <column name="ENAME" length="20" not-null="true" />
        </property>        

    </class>
</hibernate-mapping>
                    

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

package cn.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

/**
 * session工厂
 * @author Administrator
 *
 */
public class Sft {
private    static Session session;
    /**开启会话
     * @return
     */
    public static Session getSession(){
        Configuration config=new Configuration().configure();
        SessionFactory session=config.buildSessionFactory().openSession();        
        return session;                
    } 
    public static void closeSession(){
        if (session!=null) {
            session.close();
        }
        
    }
}