Spring学习4_整合Hibernate进行数据库操作

    很多项目中后端通过Spring+hibernate进行数据库操作，这里通过一个简单Demo来模拟其原型。

   代码结构

   

      1、Spring配置如下：

    

<?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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
   
   
   <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/hibernate"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
   </bean>  
    
   <bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="myDataSource"/>
        <property name="mappingResources">
        <list>
            <value>student.hbm.xml</value>
        </list>
        </property>
        <property name="hibernateProperties">
            <value>
              hibernate.dialect=org.hibernate.dialect.MySQLDialect
            </value>
        </property>
   </bean>
         
   <bean id = "dao" class="com.dao.UserDaoImpl"> 
           <property name="sessionFactory" ref="mySessionFactory"></property>
   </bean>
   
   <bean id="userService" class="com.service.UserService">
            <property name="dao" ref="dao"></property>
   </bean> 
  
</beans>

   其中以下部分声明的是数据源，目前常用的有dbcp或者C3P0的数据源，内层则为数据库连接的各项参数。

   <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/hibernate"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>

   </bean>  

 以下部分为hibernate的sessionFactory注入配置

   <bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="myDataSource"/>
        <property name="mappingResources">
        <list>
            <value>student.hbm.xml</value>
        </list>
        </property>
        <property name="hibernateProperties">
            <value>
              hibernate.dialect=org.hibernate.dialect.MySQLDialect
　　　　　　    hibernate.show_sql=true
            </value>
        </property>
   </bean>

其实现类为Spring自带的org.springframework.orm.hibernate4.LocalSessionFactoryBean ( 这里我用的Spring 4.X版本)；

dateSource为上述配置中的数据源；

student.hbm.xml则为hibernate的一个单表映射文件。

hibernateProperties中可以配置hibernate对应的属性，如方言dialect、sql显示show_sql等。

  

2、Dao层实现

package com.dao;

import org.hibernate.Session;
import org.hibernate.SessionFactory;

import com.vo.Student;


public class UserDaoImpl implements UserDao {
    private SessionFactory sessionFactory;
    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @Override
    public void save(Student student) {
        Session session = sessionFactory.openSession();
        session.getTransaction().begin();
        session.save(student);
        System.out.println("excute save;");
        session.getTransaction().commit();
    }

    @Override
    public void delete() {
        System.out.println("excute delete;");
        
    }

}

3、将Dao层注入进Service层，实现如下：

package com.service;

import com.dao.UserDao;
import com.vo.Student;

public class UserService {
    
    private UserDao dao;

    public void setDao(UserDao dao) {
        this.dao = dao;
    }
    
    public void save(){
        Student student = new Student(2, "test2", 30);
        dao.save(student);
    }      
}

简单测试如下：

package com.test;

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

import com.service.UserService;

public class TestAopAnnotation {
    @Test
    public void testAopAnnotation(){
        
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
        
        UserService service = (UserService) context.getBean("userService");
        service.save();
    }
}

 测试结果：