Spring事务配置的五种方式
前段时间对Spring的事务配置做了比较深入的研究,在此之间对Spring的事务配置虽说也配置过,但是一直没有一个清楚的认识。通过这次的学习发觉Spring的事务配置只要把思路理清,还是比较好掌握的。
总结如下:
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
- <bean id="sessionFactory"
- class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
- <property name="configLocation" value="classpath:hibernate.cfg.xml" />
- <property name="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">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- <!-- 配置DAO -->
- <bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- <bean id="userDao"
- class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
- <!-- 配置事务管理器 -->
- <property name="transactionManager" ref="transactionManager" />
- <property name="target" ref="userDaoTarget" />
- <property name="proxyInterfaces" value="com.bluesky.spring.dao.GeneratorDao" />
- <!-- 配置事务属性 -->
- <property name="transactionAttributes">
- <props>
- <prop key="*">PROPAGATION_REQUIRED</prop>
- </props>
- </property>
- </bean>
- lt;/beans>
第二种方式:所有Bean共享一个代理基类
- <bean id="sessionFactory"
- class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
- <property name="configLocation" value="classpath:hibernate.cfg.xml" />
- <property name="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">
- <property name="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 -->
- <property name="transactionManager" ref="transactionManager" />
- <!-- 配置事务属性 -->
- <property name="transactionAttributes">
- <props>
- <prop key="*">PROPAGATION_REQUIRED</prop>
- </props>
- </property>
- </bean>
- <!-- 配置DAO -->
- <bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- <bean id="userDao" parent="transactionBase" >
- <property name="target" ref="userDaoTarget" />
- </bean>
- </beans>
第三种方式:使用拦截器
- <bean id="sessionFactory"
- class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
- <property name="configLocation" value="classpath:hibernate.cfg.xml" />
- <property name="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">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- <bean id="transactionInterceptor"
- class="org.springframework.transaction.interceptor.TransactionInterceptor">
- <property name="transactionManager" ref="transactionManager" />
- <!-- 配置事务属性 -->
- <property name="transactionAttributes">
- <props>
- <prop key="*">PROPAGATION_REQUIRED</prop>
- </props>
- </property>
- </bean>
- <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
- <property name="beanNames">
- <list>
- <value>*Dao</value>
- </list>
- </property>
- <property name="interceptorNames">
- <list>
- <value>transactionInterceptor</value>
- </list>
- </property>
- </bean>
- <!-- 配置DAO -->
- <bean id="userDao" class="com.bluesky.spring.dao.UserDaoImpl">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- </beans>
第四种方式:使用tx标签配置的拦截器
- <context:annotation-config />
- <context:component-scan base-package="com.bluesky" />
- <bean id="sessionFactory"
- class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
- <property name="configLocation" value="classpath:hibernate.cfg.xml" />
- <property name="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">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- <tx:advice id="txAdvice" transaction-manager="transactionManager">
- <tx:attributes>
- <tx:method name="*" propagation="REQUIRED" />
- </tx:attributes>
- </tx:advice>
- <aop:config>
- <aop:pointcut id="interceptorPointCuts"
- expression="execution(* com.bluesky.spring.dao.*.*(..))" />
- <aop:advisor advice-ref="txAdvice"
- pointcut-ref="interceptorPointCuts" />
- </aop:config>
- lt;/beans>
第五种方式:全注解
- <context:annotation-config />
- <context:component-scan base-package="com.bluesky" />
- <tx:annotation-driven transaction-manager="transactionManager"/>
- <bean id="sessionFactory"
- class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
- <property name="configLocation" value="classpath:hibernate.cfg.xml" />
- <property name="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">
- <property name="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 UserDaoImpl extends HibernateDaoSupport implements UserDao {
- public List<User> listUsers() {
- return this.getSession().createQuery("from User").list();
- }
- }