马士兵Spring-hibernate整合

spring整合hibernate：

1.sessionFactory只需要一个就可以了，单例，适合spring管理；

2.HIbernate中的SessionFactory是接口；spring中实现了这个接口，

　class是：org.springframework.orm.hibernate3.LocalSessionFactoryBean，具体是怎么代码实现这个接口的不知道；

   这里使用支持hibernate注解的class，org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean，（是extends  LocalSessionFactoryBean的）

3.整合transaction的管理

 

引入hibernate的jar包：

 

一、初步整合，没有transaction的管理：　　　　　　　　　　　　　　　　　　

beans.xml:

<?xml version="1.0" encoding="UTF-8"?>
<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:aop="http://www.springframework.org/schema/aop"
       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/aop
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
           
    <context:annotation-config />
    <context:component-scan base-package="com.cy"/>
    
    <!-- 如果下面使用到了占位符的方式，请在locations下面去找 -->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <value>classpath:jdbc.properties</value>
        </property>
    </bean>

    <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean> 
    
    <!-- 初始化SessionFactory 
        annotatedClasses :  接收对那些类做了注解
    -->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="annotatedClasses">
            <list>
                <value>com.cy.model.User</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>
    
    
</beans>

User.java实体类：

package com.cy.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;


@Entity
public class User {
    private int id;
    private String username;
    private String password;
    
    @Id
    @GeneratedValue
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
　　......
    .......
}

User实体对应数据库中的表：

dao实现类UserDAOImpl.java:

package com.cy.dao.impl;
import javax.annotation.Resource;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.stereotype.Component;

@Component
public class UserDAOImpl implements UserDAO {
    
    @Resource
    private SessionFactory sessionFactory;
    
    public void save(User user) {
        Session s = sessionFactory.openSession();    //这里写getCurrentSession不行  为什么--这里和transaction的管理有关
        s.beginTransaction();
        s.save(user);
        s.getTransaction().commit();
        System.out.println("user saved!");
    }

}

UserService.java:

package com.cy.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Component;

import com.cy.dao.UserDAO;
import com.cy.model.User;

@Component("userService")
public class UserService {
    
    @Resource
    private UserDAO userDAO;  
    
    public void init() {
        System.out.println("init");
    }
    
    public void add(User user) {
        userDAO.save(user);
    }
    
    
    public UserDAO getUserDAO() {
        return userDAO;
    }
    
    public void setUserDAO( UserDAO userDAO) {
        this.userDAO = userDAO;
    }
    
    public void destroy() {
        System.out.println("destroy");
    }
}

测试代码：

package com.cy.service;

import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.cy.model.User;

public class UserServiceTest {
    
    @Test
    public void testAdd() throws Exception {
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
        UserService service = (UserService)ctx.getBean("userService");
        System.out.println(service.getClass());
        service.add(new User());
        ctx.destroy();
    }
}

console：

二、