Spring-Transaction 事务配置的五种实现方式
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Spring 使应用开发者能够使用在 任何环境 下使用 一致 的编程模型。你可以只写一次你的代码,这在不同环境下的不同事务管理策略中很有益处。Spring框架同时提供声明式和编程式事务管理。声明事务管理是多数使用者的首选,在多数情况下是被推荐使用的。
使用编程式事务管理,开发者直接使用Spring框架事务抽象,这个抽象可以使用在任何底层事务基础之上。
使用首选的声明式模型,开发者通常书写很少的或没有与事务相关的代码,因此不依赖Spring框架或任何其他事务API。
Spring配置文件中关于事务配置总是由三个组成部分,分别是DataSource、TransactionManager和代理机制这三部分,无论哪种配置方式,一般变化的只是代理机制这部分。
DataSource、TransactionManager这两部分只是会根据数据访问方式有所变化,比如使用Hibernate进行数据访问时,DataSource实际为SessionFactory,TransactionManager的实现为HibernateTransactionManager。
具体如下图:
根据代理机制的不同,总结了五种Spring事务的配置方式,配置文件如下:
第一种方式:每个Bean都有一个代理
<?xml version="1.0" encoding="UTF-8"?>
<beansxmlns="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">
<beanid="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<propertyname="configLocation" value="classpath:hibernate.cfg.xml" />
<propertyname="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
</bean>
<!-- 定义事务管理器(声明式的事务)-->
<beanid="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
<!-- 配置DAO-->
<beanid="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
<beanid="userDao"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<!-- 配置事务管理器-->
<propertyname="transactionManager" ref="transactionManager" />
<propertyname="target" ref="userDaoTarget" />
<propertyname="proxyInterfaces" value="com.bluesky.spring.dao.GeneratorDao" />
<!-- 配置事务属性-->
<propertyname="transactionAttributes">
<props>
<propkey="*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
</beans>
----------------------------------------------------------------------------------------------------------------
第二种方式:所有Bean共享一个代理基类
<?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">
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<propertyname="configLocation" value="classpath:hibernate.cfg.xml" />
<propertyname="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
</bean>
<!-- 定义事务管理器(声明式的事务)-->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="transactionBase"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
lazy-init="true" abstract="true">
<!-- 配置事务管理器-->
<propertyname="transactionManager" ref="transactionManager" />
<!-- 配置事务属性-->
<propertyname="transactionAttributes">
<props>
<propkey="*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!-- 配置DAO -->
<bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="userDao" parent="transactionBase" >
<propertyname="target" ref="userDaoTarget" />
</bean>
</beans>
----------------------------------------------------------------------------------------------------------------
第三种方式:使用拦截器
<?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">
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<propertyname="configLocation" value="classpath:hibernate.cfg.xml" />
<propertyname="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
</bean>
<!-- 定义事务管理器(声明式的事务)-->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
<propertyname="transactionManager" ref="transactionManager" />
<!-- 配置事务属性-->
<propertyname="transactionAttributes">
<props>
<propkey="*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<propertyname="beanNames">
<list>
<value>*Dao</value>
</list>
</property>
<propertyname="interceptorNames">
<list>
<value>transactionInterceptor</value>
</list>
</property>
</bean>
<!-- 配置DAO -->
<bean id="userDao" class="com.bluesky.spring.dao.UserDaoImpl">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
</beans>
----------------------------------------------------------------------------------------------------------------
第四种方式:使用Spring的tx和AOP标签配置的拦截器
<?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"
xmlns:tx="http://www.springframework.org/schema/tx"
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
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<context:annotation-config/>
<context:component-scanbase-package="com.bluesky" />
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<propertyname="configLocation" value="classpath:hibernate.cfg.xml" />
<propertyname="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
</bean>
<!-- 定义事务管理器(声明式的事务)-->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:methodname="*" propagation="REQUIRED" />
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcutid="interceptorPointCuts"
expression="execution(* com.bluesky.spring.dao.*.*(..))" />
<aop:advisoradvice-ref="txAdvice"
pointcut-ref="interceptorPointCuts" />
</aop:config>
</beans>
----------------------------------------------------------------------------------------------------------------
第五种:全注解
<?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"
xmlns:tx="http://www.springframework.org/schema/tx"
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
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<context:annotation-config/>
<context:component-scanbase-package="com.bluesky" />
<tx:annotation-driventransaction-manager="transactionManager"/>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<propertyname="configLocation" value="classpath:hibernate.cfg.xml" />
<propertyname="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
</bean>
<!-- 定义事务管理器(声明式的事务)-->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<propertyname="sessionFactory" ref="sessionFactory" />
</bean>
</beans>
此时在DAO上需加上@Transactional注解,如下:
package com.bluesky.spring.dao;
import java.util.List;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import org.springframework.stereotype.Component;
import com.bluesky.spring.domain.User;
@Transactional
@Component("userDao")
public class UserDaoImplextends HibernateDaoSupportimplements UserDao {
public List<User> listUsers() {
return this.getSession().createQuery("from User").list();
}
}
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