学步园

为什么要整合Hibernate？
1、使用Spring的IOC功能管理SessionFactory对象
 LocalSessionFactoryBean
2、使用Spring管理Session对象 
 HibernateTemplate
3、使用Spring的功能实现声明式的事务管理

整合Hibernate的步骤：
1、配置SessionFactory（可以自动完成）
 <bean id="sessionFactory"  class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
  <property name="configLocation"
   value="classpath:hibernate.cfg.xml">
  </property>
 </bean>

2、配置HibernateTemplate，用于完成数据操作
 <bean id="hibernateTemplete" class="org.springframework.orm.hibernate3.HibernateTemplate">
  <property name="sessionFactory" ref="sessionFactory"></property>
 </bean>

3、让Common继承HibernateDaoSupport类，该类提供了HibernateTemplate的getter和setter方法。

4、将hibernateTemplete注入到Common中
 <bean id="common" class="com.aptech.common.Common">
  <property name="hibernateTemplate" ref="hibernateTemplete"></property>
 </bean>

5、将Common的方法修改成hibernateTemplete的操作。
package com.aptech.common;

import java.sql.SQLException;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.springframework.dao.DataAccessException;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.aptech.exception.CommonException;
import com.aptech.htm.HibernateSessionFactory;
/**
 * 通用类,不再负责事务处理
 * 目标对象
 * @author 李赞红
 *
 * @param <POJO>
 */
public class Common<POJO> extends HibernateDaoSupport implements ICommon<POJO> {
 public void insertObject(POJO pojo) throws CommonException {
  try {
   this.getHibernateTemplate().save(pojo);
  } catch (DataAccessException e) {
   e.printStackTrace();
   throw new CommonException(e);
  }
 }

 public void updateObject(POJO pojo) throws CommonException {
  try {
   this.getHibernateTemplate().update(pojo);
  } catch (DataAccessException e) {
   e.printStackTrace();
   throw new CommonException(e);
  }
 }

 public void deleteObject(Class theClass, long id) throws CommonException {
  try {
   Object obj = this.getHibernateTemplate().load(theClass, id);
   this.getHibernateTemplate().delete(obj);
  } catch (DataAccessException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   throw new CommonException(e);
  }
 }

 public POJO loadObject(Class theClass, long id) throws CommonException {
  try {
   Object obj = this.getHibernateTemplate().load(theClass, id);
   return (POJO) obj;
  } catch (DataAccessException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   throw new CommonException(e);
  }
 }

 public List queryObjects(final String hql) throws CommonException {
  class Hc implements HibernateCallback{
   public Object doInHibernate(Session session)
     throws HibernateException, SQLException {
    return session.createQuery(hql).list();
   }
  }
  
  try {
   return this.getHibernateTemplate().executeFind(new Hc());
  } catch (DataAccessException e) {
   e.printStackTrace();
   throw new CommonException(e);
  }
 }

 public List queryObjects(Class theClazz) throws CommonException {
  return this.queryObjects("from " + theClazz.getSimpleName());
 }
}

6、配置事务
<!-- 事务管理器，相当于TransactionProxy,定义事务的开启、提交、回滚 -->
 <bean id="htm" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
  <property name="sessionFactory">
   <ref bean="sessionFactory"/>
  </property>
 </bean>
 <bean id="ti" class="org.springframework.transaction.interceptor.TransactionInterceptor">
  <property name="transactionManager">
   <ref bean="htm"/>
  </property>
  <property name="transactionAttributes">
   <props>
    <!-- key:方法名称 -->
    <prop key="insert*">PROPAGATION_REQUIRED</prop>
    <prop key="update*">PROPAGATION_REQUIRED</prop>
    <prop key="delete*">PROPAGATION_REQUIRED</prop>
    <prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
    <prop key="query*">PROPAGATION_REQUIRED,readOnly</prop>
   </props>
  </property>
 </bean>
 
 <!-- 自动代理，代理业务对象 -->
 <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
  <property name="beanNames">
   <list>
    <value>common</value>
   </list>
  </property>
  <property name="interceptorNames">
   <list>
    <value>ti</value>
   </list>
  </property>
 </bean>

7、将common注入Dao
 <bean id="baseDao" abstract="true">
  <property name="common">
   <ref bean="common"/>
  </property>
 </bean>
 
 <bean id="udao" class="com.aptech.dao.impl.UserDao" parent="baseDao"></bean>
 <bean id="rdao" class="com.aptech.dao.impl.RoleDao" parent="baseDao"></bean>

8、将Dao注入Service
 <bean id="grantService" class="com.aptech.service.impl.GrantService">
  <property name="rdao" ref="rdao"></property>
  <property name="udao" ref="udao"></property>
 </bean>