整合之道--Spring4整合Hibernate5

Spring与Hiberante整合

通过Hibernate的学习,我们知道,hibernate主要在hibernate.cfg.xml配置文件中
接下来我们看一下hibernate的一个配置文件

hibernate配置文件

hibernate.cfg.xml



<hibernate-configuration>
    <session-factory>
        
        <property name="connection.driver_class">com.mysql.jdbc.Driverproperty>
        
        <property name="connection.url">jdbc:mysql://localhost/hibernate_testproperty>
        
        <property name="connection.username">rootproperty>
        
        <property name="connection.password">chengproperty>
        
        <property name="hibernate.c3p0.max_size">20property>
        
        <property name="hibernate.c3p0.min_size">1property>
        
        <property name="hibernate.c3p0.timeout">5000property>
        
        <property name="hibernate.c3p0.max_statements">100property>
        <property name="hibernate.c3p0.idle_test_period">3000property>
        <property name="hibernate.c3p0.acquire_increment">2property>
        <property name="hibernate.c3p0.validate">trueproperty>
        
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialectproperty>
        
        <property name="hbm2ddl.auto">updateproperty>
        
        <property name="show_sql">trueproperty>
        
        <property name="hibernate.format_sql">trueproperty>
        
        <property name="hibernate.temp.use_jdbc_metadata_defaults">falseproperty>
        
        <mapping class="com.wechat.entity.po.User"/>
        <mapping class="com.wechat.entity.po.Person"/>
    session-factory>
hibernate-configuration>

配置文件的作用

hibernate.cfg.xml文件的主要作用就是配置了一个session-factory

  1. session-factory中主要通过property配置一些数据库的连接信息,我们知道,Spring通常会将这种数据库连接用dataSource来表示,这样一来,hibernate.cfg.xml文件中的所有跟数据库连接的都可以干掉了,直接用spring的dataSource,而dataSource也可以用c3p0、dbcp等。

  2. session-factory中通过property除了配置一些数据库的连接信息之外,还有一些hibernate的配置,比如方言、自动创建表机制、格式化sql等,这些信息也需要配置起来。

  3. 还有最关键的一个持久化类所在路径的配置

当不采用spring整合的时候,我们使用hibernate时主要是用hibernate从sessionFactory中去的session,然后用session来操作持久化对象,而sessionFactory来自于配置文件。像下面这样:

    StandardServiceRegistry registry =  null;
    SessionFactory sessionFactory = null;
    Session session = null;
    Transaction transaction = null;
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    @Before
    public void init() {

        registry = new StandardServiceRegistryBuilder()
                .configure() // configures settings from hibernate.cfg.xml
                .build();
        sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
        session = sessionFactory.openSession();
        //开始事务
        transaction = session.getTransaction();
        transaction.begin();
    }

    @Test
    public void testSaveUser() {
        User user = new User();
        user.setUsername("张学友");
        user.setPassword("jacky");
        user.setRegistDate(sdf.format(new Date()));
        File file = new File("D:"+File.separator+"ubuntu.png");
        String fileName = file.getName();
        String prefix=fileName.substring(fileName.lastIndexOf(".")+1);
        System.out.println(prefix);
        InputStream input = null;
        try {
            input = new FileInputStream(file);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        Blob image = null;
        try {
            image = Hibernate.getLobCreator(session).createBlob(input,input.available());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        user.setUserPic(image);
        session.save(user);
    }

    @After 
    public void destroy(){
        transaction.commit();
        session.close();
        sessionFactory.close();
        StandardServiceRegistryBuilder.destroy( registry );
    }

Spring对hibernate的整合就是将上述三点通过spring配置起来,而hibernate最关键的sessionFactroy就是spring的一个bean

这些理解了整合就简单了,

SessionFactoryBean

spring的sessionFactroy像下面这样配置:


    <context:property-placeholder location="classpath:jdbc.properties"
        file-encoding="utf-8" ignore-unresolvable="true" />

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan">
            <list>
                
                <value>com.wechat.entity.povalue>
            list>
        property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}prop>
                <prop key="hibernate.dialect">${hibernate.dialect}prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}prop>
                <prop key="hibernate.format_sql">${hibernate.format_sql}prop>
                <prop key="hibernate.temp.use_jdbc_metadata_defaults">falseprop>
            props>
        property>
    bean>

通过bean的配置可以看出该bean就是hibernate的sessionFactroy
因为它指向了org.springframework.orm.hibernate5.LocalSessionFactoryBean

在这个bean中主要配置了上面说的三点:

  1. 数据源dataSource
  2. hibernate的配置,包括方言,输出sql等
  3. 持久化类的位置,通过包进行扫描

下面给出数据源dataSource的配置

dataSource


    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close" p:driverClass="${jdbc.driverClassName}"
        p:jdbcUrl="${jdbc.url}" p:user="${jdbc.username}" p:password="${jdbc.password}"
        p:testConnectionOnCheckout="${jdbc.c3p0.testConnectionOnCheckout}"
        p:testConnectionOnCheckin="${jdbc.c3p0.testConnectionOnCheckin}"
        p:idleConnectionTestPeriod="${jdbc.c3p0.idleConnectionTestPeriod}"
        p:initialPoolSize="${jdbc.c3p0.initialPoolSize}" p:minPoolSize="${jdbc.c3p0.minPoolSize}"
        p:maxPoolSize="${jdbc.c3p0.maxPoolSize}" p:maxIdleTime="${jdbc.c3p0.maxIdleTime}" />

还有数据库的连接信息

jdbc.properties

#-----------------------------------------------------
# 数据库配置
#-----------------------------------------------------
#服务器地址
host=127.0.0.1
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://${host}:3306/hibernate_test
jdbc.username=root
jdbc.password=cheng

#-----------------------------------------------------
# 适用于c3p0的配置
#-----------------------------------------------------
#-----------------------------------------------------
# c3p0反空闲设置,防止8小时失效问题28800
#-----------------------------------------------------
#idleConnectionTestPeriod要小于MySQL的wait_timeout
jdbc.c3p0.testConnectionOnCheckout=false
jdbc.c3p0.testConnectionOnCheckin=true
jdbc.c3p0.idleConnectionTestPeriod=3600
#-----------------------------------------------------
# c3p0连接池配置
#-----------------------------------------------------
#initialPoolSize, minPoolSize, maxPoolSize define the number of Connections that will be pooled.
#Please ensure that minPoolSize <= maxPoolSize.
#Unreasonable values of initialPoolSize will be ignored, and minPoolSize will be used instead.
jdbc.c3p0.initialPoolSize=10
jdbc.c3p0.minPoolSize=10
jdbc.c3p0.maxPoolSize=100
#maxIdleTime defines how many seconds a Connection should be permitted to go unused before being culled from the pool.
jdbc.c3p0.maxIdleTime=3600
#-----------------------------------------------------
# hibernate连接池配置
#-----------------------------------------------------
hibernate.connection.driverClass=com.mysql.jdbc.Driver
hibernate.connection.url=jdbc:mysql://${host}:3306/${dbName}
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.show_sql=true
hibernate.format_sql=true
hibernate.hbm2ddl.auto=update

配置完这些还有spring强大的事务管理


    <bean id="transactionManager"
        class="org.springframework.orm.hibernate5.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    bean>

    
    <bean id="persistenceExceptionTranslationPostProcessor"
        class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

    
    

    
    
    <aop:config proxy-target-class="true">
        
        <aop:pointcut expression=" execution(* com.wechat.service..*(..))"
            id="serviceMethod" />
        
        <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethod" />
    aop:config>
    
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        
        <tx:attributes>
            <tx:method name="*" />
        tx:attributes>
    tx:advice>

好了,这些配置好之后就可以使用在spring中配置的sessionFactroy了

UserDao

package com.wechat.dao;

import java.util.List;

import com.wechat.entity.po.User;

public interface UserDao {
    // 得到所有用户
    public List getAllUser();

    // 检测用户名是否存在
    public boolean isExists(String username);

}

实现类

package com.wechat.dao.impl;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.wechat.dao.UserDao;
import com.wechat.entity.po.User;
@Repository
public class UserDaoImpl implements UserDao {
    //注入sessionFactory
    @Autowired
    private SessionFactory sessionFactory;

    @SuppressWarnings("unchecked")
    @Override
    public List getAllUser() {
        List userList = new ArrayList();
        String hsql="from User";
        Session session = sessionFactory.getCurrentSession();
        Query query = session.createQuery(hsql);
        userList = query.list();
        return userList;
    }

    @Override
    public boolean isExists(String username) {
        Query query = sessionFactory.openSession()
                .createQuery("from User u where u.username = :username").setParameter("username", username);
        System.out.println(query.list().size());
        return query.list().size()>0?true:false;
    }

}

UserService

package com.wechat.service.user;

import java.util.List;

import com.wechat.entity.po.User;

public interface UserService {
    public List getAllUser();
    public boolean isExists(String username);

}

实现类

package com.wechat.service.user.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import com.wechat.dao.UserDao;
import com.wechat.entity.po.User;
import com.wechat.service.user.UserService;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;
    @Override
    public List getAllUser() {
        return userDao.getAllUser();
    }
    @Override
    @Cacheable(cacheNames="isExists", key="#username")
    public boolean isExists(String username) {
        return userDao.isExists(username);
    }

}

因为事务管理是配置在service层,所以用service来测试

测试

package com.wechat.dao;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.wechat.entity.po.User;
import com.wechat.service.user.UserService;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:spring/spring-core.xml" })
public class UserServiceTest {
    @Autowired
    private UserService userService;

    @Test
    public void test() {
        List userList = userService.getAllUser();
        for(User user:userList){
            System.out.println(user.getUsername());
        }

    }

}

输入结果

Hibernate: 
    select
        user0_.userid as userid1_2_,
        user0_.password as password2_2_,
        user0_.registDate as registDa3_2_,
        user0_.userPic as userPic4_2_,
        user0_.username as username5_2_ 
    from
        user_info user0_
程高伟
张学友

数据库表

这里写图片描述

好了Spring整合hibernate就写到这里。

项目地址

https://github.com/peer44/testwechat

你可能感兴趣的:(整合之道,spring,springmvc,hibernate)