Sping4学习（六）整合Hibernate事务配置

        Spring整合Hibernate事务简单应用。文章简单介绍两种事务的使用，一是Spring注解的声明式事务，另一个是编程式事务。

        在Spring中配置注解声明式事务，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:tx="http://www.springframework.org/schema/tx"
    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/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
	<!-- 使用spring注解  -->
   <!--  <context:annotation-config/> -->
    <!-- 下面的配置告诉spring容器自动scanner用注解标注bean -->
   <context:component-scan base-package="org.lian"/>
<!--配置数据源  -->
	<!-- <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
        <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> -->
    <!-- 配置Druid数据库连接池 -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">   
	    <!-- 基本属性 url、user、password -->  
	    <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>     
	    <!-- 配置初始化大小、最小、最大 -->  
	    <property name="initialSize" value="1" />  
	    <property name="minIdle" value="1" />   
	    <property name="maxActive" value="20" />  
	   
	    <!-- 配置获取连接等待超时的时间 -->  
	    <property name="maxWait" value="60000" />  
	   
	    <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->  
	    <property name="timeBetweenEvictionRunsMillis" value="60000" />  
	   
	    <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->  
	    <property name="minEvictableIdleTimeMillis" value="300000" />  
	    
	    <property name="validationQuery" value="SELECT 'x'" />  
	    <property name="testWhileIdle" value="true" />  
	    <property name="testOnBorrow" value="false" />  
	    <property name="testOnReturn" value="false" />  
	   
	    <!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->  
	    <property name="poolPreparedStatements" value="true" />  
	    <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />  
	   
	    <!-- 配置监控统计拦截的filters，去掉后监控界面sql无法统计 -->  
	    <property name="filters" value="stat" />   
	</bean>
	<!-- 配置Hibernate SessionFactory -->
	<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" lazy-init="false">
        <!-- 注入datasource，给sessionfactoryBean内setdatasource提供数据源 -->
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:conf/hibernate/hibernate.cfg.xml"></property>
        <!-- //加载实体类的映射文件位置及名称 -->
        <property name="mappingLocations" value="classpath:conf/hibernate/domain/*.hbm.xml"></property>
        
        <property name="packagesToScan" value="org.lian.**.domain"></property>
    	
    </bean>  
      
    <context:property-placeholder location="classpath*:conf/datasource/jdbc.properties"/>
    
    <!-- 采用注解的方式 声明事务  -->
    <tx:annotation-driven transaction-manager="txManager"/>
    
    <bean id="txManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    	<property name="sessionFactory" ref="sessionFactory"/>
	</bean>
	
	<!-- <aop:config>
        <aop:pointcut id="businessMethods"
                expression="execution(* org.lian.business.*Business.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="businessMethods"/>
    </aop:config>

    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="addMusic*" propagation="REQUIRED"/>
            <tx:method name="editMusic*" propagation="REQUIRES_NEW"/>
            <tx:method name="*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice> -->
	
	
</beans>

        使用Hibernate事务，获取session的方式有要求,强烈推荐使用下面的方式getCurrentSession()，openSession()方式实验了几次事务无法正常回滚。dao层的代码

@Repository("musicH4Dao")
public class MusicH4DaoImpl implements MusicDao {

	@Autowired
	private SessionFactory sessionFactory;
	
	@Override
	public void update(Music music) {
		Session session = sessionFactory.getCurrentSession();
		session
				.createQuery(
						"update Music as music set music.name=:name where music.id=:id  ")
				.setParameter("name", music.getName())
				.setParameter("id", music.getId()).executeUpdate();

	}

	@Override
	public void add(Music music) {
		Session session = sessionFactory.getCurrentSession();
		session.save(music);
		session.flush();
	}

}

    业务层处理事务有两种方式，一种是声明式事务

@Service("musicBusiness")
@Transactional(readOnly = true)
public class MusicBusinessImpl implements MusicBusiness {

	@Autowired
	@Qualifier("musicH4Dao")
	private MusicDao musicDao;

	@Override
	@Transactional(readOnly = false, rollbackFor = { Exception.class })
	public void addMusic(Music music) {

		musicDao.add(music);
		Music bean = new Music();
		bean.setId("123");
		bean.setName("测试" + IdGenerator.getInstance().getUUID());
		musicDao.update(bean);

	}
}

        另一种采用编程式事务处理

@Service("music2Business")
public class Music2BussinessImpl implements MusicBusiness {

	private TransactionTemplate transactionTemplate;

	@Qualifier("txManager")
	@Autowired
	public void setTransactionManager(
			PlatformTransactionManager transactionManager) {
		this.transactionTemplate = new TransactionTemplate(transactionManager);
	}

	@Autowired
	@Qualifier("musicH4Dao")
	private MusicDao musicDao;

	@Override
	public void addMusic(final Music music) {
		// TODO Auto-generated method stub
		this.transactionTemplate.execute(new TransactionCallbackWithoutResult() {
			public void doInTransactionWithoutResult(TransactionStatus status) {
				musicDao.add(music);
				Music bean = new Music();
				// music.setName("测试");
				bean.setId("123");
				bean.setName("测试" + IdGenerator.getInstance().getUUID());
				musicDao.update(bean);
			}
		});

		/*
		 * transactionTemplate.execute(new TransactionCallback<String>() { // the
		 * code in this method executes in a transactional context public String
		 * doInTransaction(TransactionStatus status) { return null; } });
		 */

	}
}