项目中DAO的结构实现

 

 

首先是定义基础DAO接口：

 

 

package com.tch.test.ssh.dao;

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

public interface BaseDao<E, PK extends Serializable> {
	/**
	 *  Created on 2013-9-16 
	 * <p>DiscripEion:保存对象</p>
	 * @reEurn void
	 */
	void save(E entity);
	/**
	 *  Created on 2013-9-16 
	 * <p>DiscripEion:更新对象</p>
	 * @reEurn void
	 */
	void update(E entity);
	/**
	 *  Created on 2013-9-16 
	 * <p>DiscripEion:删除对象</p>
	 * @reEurn void
	 */
	void delete(E entity);
	/**
	 *  CreaEed on 2013-9-16 
	 * <p>DiscripEion:根据id查询对象</p>
	 * @reEurn void
	 */
	E get(PK id);
	/**
	 *  Created on 2013-9-16 
	 * <p>DiscripEion:查询全部对象</p>
	 * @reEurn void
	 */
	List<E> getAll();
	
}

 

 

以及配置sessionFactory的基础类：

 

package com.tch.test.ssh.dao;

import javax.annotation.Resource;

import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class CommomDao extends HibernateDaoSupport{

	@Resource(name="sessionFactory")//这里由于父类中的setSessionFactory()方法是final的，不能重写，所以要换个方法名字，在方法里面调用父类的setSessionFactory()方法
	public void setSuperSessionFactory(SessionFactory sessionFactory){
		this.setSessionFactory(sessionFactory);
	}
	
}

 

 实体类以及映射文件：

 

 

package com.tch.test.ssh.entity;
// default package

import java.util.Date;


/**
 * MyTime entity. @author MyEclipse Persistence Tools
 */

public class MyTime  implements java.io.Serializable {


    // Fields    

     private static final long serialVersionUID = 1L;
     private Integer id;
     private Date addTime;


    // Constructors

    /** default constructor */
    public MyTime() {
    }

    
    /** full constructor */
    public MyTime(Date addTime) {
        this.addTime = addTime;
    }

   
    // Property accessors

    public Integer getId() {
        return this.id;
    }
    
    public void setId(Integer id) {
        this.id = id;
    }

    public Date getAddTime() {
        return this.addTime;
    }
    
    public void setAddTime(Date addTime) {
        this.addTime = addTime;
    }

}

 

 

<?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="com.tch.test.ssh.entity.MyTime" table="t_times" catalog="test">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native"></generator>
        </id>
        <property name="addTime" type="java.util.Date">
            <column name="addTime" length="8" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

 

然后是基础DAO实现类：

 

 

package com.tch.test.ssh.dao;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;

public class BaseDaoImpl<E, PK extends Serializable> extends CommomDao implements BaseDao<E,PK>{

	private Class<E> clazz;
	
	@SuppressWarnings("unchecked")
	public BaseDaoImpl(){
		this.clazz = (Class<E>)((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];//反射方式获取子类泛型的实际类型
	}
	
	@Override
	public void delete(E entity) {
		getHibernateTemplate().delete(entity);
	}

	@SuppressWarnings("unchecked")
	@Override
	public E get(PK id) {
		return (E)getHibernateTemplate().get(clazz, id);
	}

	@SuppressWarnings("unchecked")
	@Override
	public List<E> getAll() {
		return getHibernateTemplate().loadAll(clazz);
		/*String hql = "from "+clazz.getName();
		System.out.println("hql: "+hql);
		return getSession().createQuery(hql).list();*/
	}

	@Override
	public void save(E entity) {
		getHibernateTemplate().save(entity);
	}

	@Override
	public void update(E entity) {
		getHibernateTemplate().update(entity);
	}

}

 

接下来是接口演示：

 

 

 

package com.tch.test.ssh.dao;

import com.tch.test.ssh.entity.MyTime;

public interface TimeDao extends BaseDao<MyTime, Integer>{

	
}

 

 

实现类演示（只需要继承BaseDaoImpl类，就含有了基本的增删改查等方法）：

 

 

 

package com.tch.test.ssh.dao;

import org.springframework.stereotype.Repository;

import com.tch.test.ssh.entity.MyTime;
@Repository("TimeDao")
public class TimerDaoImpl extends BaseDaoImpl<MyTime, Integer> implements TimeDao{

}

 

 

最近贴上applicationContext.xml的内容：

 

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
				http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
	<!-- 启动注入功能 -->
	<context:annotation-config />
	<!-- 启动扫描component功能 -->
	<context:component-scan base-package="com.tch.test" />
	<!-- 启动注解实物配置功能 -->
	<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
	<!-- 数据源 -->
	<bean id="dataSource"
		class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
		<property name="url" value="jdbc:mysql://localhost:3306/test"></property>
		<property name="username" value="root"></property>
		<property name="password" value="root"></property>
	</bean>
	<!-- 事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>
	<!--读取数据库配置文件  -->
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<property name="mappingLocations">
			 <value>classpath:com/tch/test/ssh/entity/*.hbm.xml</value>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
	</bean>
</beans>

 

 加上测试类：

 

package test;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.tch.test.ssh.dao.TimeDao;
import com.tch.test.ssh.entity.MyTime;

public class TestSpring {

	public static void main(String[] args) throws Exception {
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		TimeDao dao = (TimeDao) context.getBean("TimeDao");
		List<MyTime> entities = dao.getAll();
		for(MyTime entity:entities){
			System.out.println(entity.getId()+" , "+entity.getAddTime());
		}
	}
	
}