HibernateDaoSupport的应用

 

BaseDaoHibernateImpl

package com.xy.dao.impl;

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

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

public class BaseDaoHibernateImpl extends HibernateDaoSupport
{
 public Object get(final Class entity, final Serializable id)
 {
  return getHibernateTemplate().get(entity, id);
 }

 public Object load(final Class entity, final Serializable id)
 {
  return getHibernateTemplate().load(entity, id);
 }

 public void delete(final Object entity)
 {
  getHibernateTemplate().delete(entity);
 }

 public void save(final Object entity)
 {
  getHibernateTemplate().save(entity);

 }

 public void update(final Object entity)
 {
  getHibernateTemplate().update(entity);

 }

 public List findByHql(String Hql)
 {
  return getHibernateTemplate().find(Hql);
 }

 public void delBySql(String sqlStr)
 {
  final String sql = sqlStr;
  getHibernateTemplate().execute(new HibernateCallback()
  {
   public Object doInHibernate(Session session) throws HibernateException, SQLException
   {
    session.connection().createStatement().executeUpdate(sql);
    return null;
   }
  });
 }
}

ClassesDaoImpl

public class ClassesDaoImpl extends BaseDaoHibernateImpl implements IClassDao
{

 public List<Classes> GetAllClasses()
 {
  String hql = "from Classes";
  return super.findByHql(hql);
 }

 public Classes GetModel(int id)
 {
  return (Classes) super.get(Classes.class, id);
 }
}

ManagerDaoImpl

public class ManagerDaoImpl extends BaseDaoHibernateImpl implements IManagerDao
{
 public Manager FindManager(String uname, String pwd)
 {
  Manager m = null;
  Session session = null;
  Transaction tran = null;
  try
  {
   session = super.getSession();
   tran = session.beginTransaction();
   String hql = "from Manager m where m.loginName = ? and m.passwd = ?";
   Query query = session.createQuery(hql);
   query.setString(0, uname);
   query.setString(1, pwd);
   m = (Manager) query.uniqueResult();
   tran.commit();
  }
  catch (Exception e)
  {
   e.printStackTrace();
   tran.rollback();
  }
  finally
  {
   this.getSession().close();
  }
  return m;
 }

}

Spring的bean.xml注入

<!-- 整合hibernate -->
 <bean id="dataSource"
  class="org.springframework.jdbc.datasource.DriverManagerDataSource">
  <property name="driverClassName" value="com.mysql.jdbc.Driver" />
  <property name="url" value="jdbc:mysql://localhost:3306/stuinfo" />
  <property name="username" value="root" />
  <property name="password" value="root" />
 </bean>
 <bean id="sessionFactory"
  class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
  <property name="dataSource" ref="dataSource" />
  <property name="configLocation">
   <value>classpath:hibernate.cfg.xml</value>
  </property>
 </bean>

 <!-- DAO的配置,通过Spring注入sessionFactory -->
 <bean id="classDao" class="com.xy.dao.impl.ClassesDaoImpl">
  <property name="sessionFactory" ref="sessionFactory" />
 </bean>
 <bean id="managerDao" class="com.xy.dao.impl.ManagerDaoImpl">
  <property name="sessionFactory" ref="sessionFactory" />
 </bean>

为什么要注入sessionFactory呢？

继承了org.springframework.orm.hibernate3.support.HibernateDaoSupport,spring在初始化容器的时候会对这个对象作一个check, 看下HibernateDaoSupport源码中的checkDaoConfig()方法 就清楚啦:

protected final void checkDaoConfig()
{      
    if (this.hibernateTemplate == null)
    {      
        throw new IllegalArgumentException
            ("'sessionFactory' or 'hibernateTemplate' is required");    
    }      
}