hibernate步骤

1.读取并解析配置文件及映射文件

Configuration conf=new Configuration().configure();

2.依据配置文件和映射文件中的信息，创建SessionFactory对象                                      1.2.3通常写在HbiernateUtil静态方法中

SessionFactory sf=conf.buildSessionFactory();                                                                 并在Dao层中返回session

3.打开session

Session session=sf.getCurrentSession()

 

4.开始一个事务

Transaction tx=session.beginTransaction()

5.数据库操作

session.save(user);

              delete

              update

6.结束事务

tx.commit()

7.如果是openSission().则需要session.close()

 

 

 

 

 

 

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>

<session-factory>
<property name="myeclipse.connection.profile">orcl</property>
<property name="dialect">
org.hibernate.dialect.Oracle9Dialect
</property>
<property name="connection.password">tiger</property>
<property name="connection.username">scott</property>
<property name="connection.url">
jdbc:oracle:thin:@127.0.0.1:1521:orcl
</property>
<property name="connection.driver_class">
oracle.jdbc.OracleDriver
</property>

<property name="current_session_context_class">thread</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>

<mapping resource="entities/BlogBlog.hbm.xml" />
<mapping resource="entities/BlogUser.hbm.xml" />

 

</session-factory>

</hibernate-configuration>

 

 

 

entity.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
<class name="entities.BlogBlog" table="BLOG_BLOG" schema="SCOTT">
<id name="id" type="java.lang.Long">
<column name="ID" precision="10" scale="0" />
<generator class="assigned" />
</id>
<many-to-one name="blogUser" class="entities.BlogUser" fetch="select">
<column name="USERID" precision="10" scale="0" not-null="true" />
</many-to-one>
<property name="content" type="java.lang.String">
<column name="CONTENT" length="1000" not-null="true" />
</property>
<property name="publishtime" type="java.lang.String">
<column name="PUBLISHTIME" not-null="true" />
</property>
</class>
</hibernate-mapping>

 

public class HibernateUtil{

private static Configuration configuration;

private final static SessionFactory sessionFactory;

static{

try{

configuration=new Configuration().configure();

sessionFactory=configuration.buildSessionFactory();

}catch(HibernateException ex){

throw new ExceptionInInitializeError(ex)}}

privateHibernateUtil(){}

public static Session currentSession(){return sessionFactory.getCurrentSession();}

}