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");

}

}