HibernateDaoSupport的应用-优快云博客

本文介绍了一个基于Spring和Hibernate框架的通用DAO实现案例，详细展示了BaseDaoHibernateImpl的基础操作及具体DAO实现，如ClassesDaoImpl和ManagerDaoImpl，并解释了如何在Spring配置文件中注入sessionFactory。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

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

<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>

<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"); } }