Hibernate——与Spring整合

一、Spring和Hibernate整合步骤

参考：https://mp.weixin.qq.com/s/pIMWtg8t8N-CUtvu-lIqkQ
Spring和Hibernate整合的关键点：
——SessionFactory对象交给Spring来创建
——Hibernate的事务交给Spring进行管理

1.1 引入jar包

连接池/数据库驱动包
Hibernate相关jar
Spring 核心包(5个)
Spring aop 包(4个)
spring-orm-3.2.5.RELEASE.jar 【spring对hibernate的支持】
spring-tx-3.2.5.RELEASE.jar 【事务相关】

1.2 配置文件

bean.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

beans>

hibernate.cfg.xml

<hibernate-configuration>
    
    <session-factory>

        
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driverproperty>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/shopping?useUnicode=true&characterEncoding=utf8property>
        <property name="hibernate.connection.username">rootproperty>
        <property name="hibernate.connection.password">123456property>
        
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialectproperty>
        
        
        <property name="hibernate.show_sql">trueproperty>
        
        <property name="hibernate.format_sql">trueproperty>
        
        <property name="hibernate.hbm2ddl.auto">updateproperty>
    session-factory>
hibernate-configuration>

1.3 搭建配置环境测试

User.java

public class User {
    private String name;
    private String password;
    private int id;
}

IUser.java

public interface IUser {
    void save();
}

UserDao.java

public class UserDao implements IUser {
    @Override
    public void save() {
    }
}

UserService.java

public class UserService {
    private UserDao userDao;
    public void save() {
        userDao.save();
    }
}

1.3.1 测试Spring环境

为userDao、userService使用Spring来创建对象，以及添加对象的依赖关系，看看Spring的环境是否成功。

创建UserDao实例—>@Repository
UserDao.java

@Repository
public class UserDao implements IUser {
    @Override
    public void save() {
    }
}

创建userService实例，并注入userDao属性
UserService.java

@Service
public class UserService {
	@Autowired
    private UserDao userDao;
    public void save() {
        userDao.save();
    }
}

在Spring配置文件中使用注解扫描器
bean.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	<context:component-scan base-package="com.my"/>
beans>

测试：成功得到userService对象，并且userService对象含有userDao属性的值

public class Test {
    @Test
    public void test1() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("spring-config.xml");
        UserService userService = (UserService) ac.getBean("userService");
        System.out.println(userService);
    }
}

1.3.2 测试Hibernate环境

映射配置文件
User.hbm.xml

<hibernate-mapping package="com.my.entity">
    <class name="User" table="t_user">
        <id name="id" column="user_id">
            <generator class="native"/>
        id>
        <property name="name" column="name"/>
        <property name="password" column="password"/>
    class>
hibernate-mapping>

主配置文件加载映射文件
Hibernate.cfg.xml

<mapping resource="com/my/entity/User.hbm.xml" />

创建SessionFactory，Session

@Repository
public class UserDao implements IUser {
    @Override
    public void save(User user) {
        //得到SessionFactory
        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        //得到Session
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(user);
        session.getTransaction().commit();
        session.close();
    }
}

测试

public class Test2 {
    @Test
    public void test2() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("spring-config.xml");
        UserService userService = (UserService) ac.getBean("userService");
        userService.save(new User());
    }
}

二、使用Spring创建SessionFactory对象

2.1 直接加载hibernate主配置文件

bean.xml

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
	
	<property name="configLocation" value="classpath:hibernate.cfg.xml"/>
bean>

那么在userDao中就不用我们自己手动来创建SessionFactory对象了。

@Repository
public class UserDao implements IUser {
    @Autowired
    private SessionFactory sessionFactory;
    @Override
    public void save(User user) {
        //得到Session
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(user);
        session.getTransaction().commit();
        session.close();
    }
}

2.2 连接池交给Spring管理

Hibernate对C3P0的连接池支持度比不上Spring，因此可以使用Spring的连接池。因此我们加载Hibernate的主配置文件又使用Spring的数据库连接池。即一部分配置在hibernate.cfg.xml，一部分配置在Spring文件中。
bean.xml

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
	<property name="driverClass" value="com.mysql.jdbc.Driver"/>
	<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/shopping?useUnicode=true&characterEncoding=utf8"/>
	<property name="user" value="root"/>
	<property name="password" value="123456"/>
	<property name="initialPoolSize" value="3"/>
	<property name="maxPoolSize" value="10"/>
	<property name="maxStatements" value="100"/>
	<property name="acquireIncrement" value="2"/>
bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
	
	<property name="configLocation" value="classpath:hibernate.cfg.xml"/>
	<property name="dataSource" ref="dataSource"/>
bean>

2.3 配置文件全写Spring中

推荐
bean.xml

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
	<property name="driverClass" value="com.mysql.jdbc.Driver"/>
	<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/shopping?useUnicode=true&characterEncoding=utf8"/>
	<property name="user" value="root"/>
	<property name="password" value="123456"/>
	<property name="initialPoolSize" value="3"/>
	<property name="maxPoolSize" value="10"/>
	<property name="maxStatements" value="100"/>
	<property name="acquireIncrement" value="2"/>
bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
	<property name="dataSource" ref="dataSource"/>
	
	<property name="hibernateProperties">
		<props>
			<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialectprop>
			<prop key="hibernate.show_sql">trueprop>
			<prop key="hibernate.hbm2ddl.auto">updateprop>
		props>
	property>
	
	<property name="mappingLocations">
		<list>
			<value>com/my/entity/User.hbm.xmlvalue>
		list>
	property>
bean>

<context:component-scan base-package="com.my"/>

三、Spring管理事务

到目前为止，我们是使用Hibernate编程式事务控制管理，Spring与Hibernate整合另一个关键就是使用Spring对Hibernate进行事务管理。
注意：Spring与Hibernate整合，Spring只支持线程的Session，并且不用我们手动配置。

注册HibernateTransactionManager类：
bean.xml

 
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
	
	<property name="sessionFactory" ref="sessionFactory"/>
bean>

<tx:annotation-driven transaction-manager="txManager"/>

UserDao.java

@Repository
public class UserDao implements IUser {
    @Autowired
    private SessionFactory sessionFactory;
    @Override
    public void save(User user) {
        sessionFactory.getCurrentSession().save(user);
    }
}

UserService类添加@Transactional注解就是为Hibernate添加了事务管理了。
UserService.java

@Service
@Transactional
public class UserService {
    @Autowired
    private UserDao userDao;
    public void save(User user) {
        userDao.save(user);
    }
}