java - 如果TransactionProxyFactoryBean用于服务层bean，那么是否有必要在dao中驱动事务注释？

服务层的接口是：

EMS.java:

public interface EMS extends UserDetailsService {

    public void saveUser(User user);
}

及其实现：

EMSImpl.java:

@Service("emsImpl")
@Transactional(readOnly=true)
public class EMSImpl implements EMS {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Autowired
    @Qualifier("dao")
    private EMSDao dao;


    @Transactional(readOnly=false)
    public void saveUser(User user) {
        dao.saveUser();
    }
}

dao的接口：

EMSDao.java:

public interface EMSDao {

    public void saveUser(User user);
}

及其实现：

HibernateEMSDao.java

@Repository("EMSDao")
public class HibernateEMSDao extends HibernateDaoSupport implements EMSDao {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    private SchemaHelper schemaHelper;

    public void setSchemaHelper(SchemaHelper schemaHelper) {
        this.schemaHelper = schemaHelper;
    }

    @Transactional(readOnly=false)
    public synchronized void saveUser(final User user) {
        Session session = getSessionFactory().getCurrentSession();
        session.merge(user);
        }

    private void storeUser(User user) {
        getHibernateTemplate().save(user);
    }

    public void createSchema() {
        try {
            getHibernateTemplate().find("from User user where user.id = 1");
        } catch (Exception e) {
            logger.warn("expected database schema does not exist, will create. Error is: " + e.getMessage());
            schemaHelper.createSchema();
            User admin = new User();
            admin.setUsername("admin");
            admin.setName("Admin");
            admin.setEmail("admin");
            admin.setPassword("21232f297a57a5a743894a0e4a801fc3");
            admin.setRoles(new HashSet<Role>(Arrays.asList(new Role("admin", "ADMINISTRATOR"))));
            logger.info("inserting default admin user into database");
            storeUser(admin);
            logger.info("schema creation complete");
            return;
        }
        logger.info("database schema exists, normal startup");
    }
}

ems中的豆appliactionContext.xml由TransactionProxyFactoryBean创建。我也在用<tx:annotation-driven />

完整的applicationContext.xml是：

<?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:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

    <bean class="info.ems.config.EMSConfigurer"/>

    <bean id="passwordEncoder" class="org.acegisecurity.providers.encoding.Md5PasswordEncoder"/>

    <bean id="ems" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
    <property name="transactionManager" ref="transactionManager"/>
    <property name="target">
        <bean class="info.ems.EMSImpl" init-method="init">
            <property name="dao" ref="dao"/>
            <property name="passwordEncoder" ref="passwordEncoder"/>
            <property name="localeList" value="${ems.locales}"/>
            <property name="releaseVersion" value="${ems.version}"/>
            <property name="releaseTimestamp" value="${ems.timestamp}"/>
            <property name="emsHome" value="${ems.home}"/>
        </bean>
    </property>
    <property name="transactionAttributes">
        <props>
            <prop key="store*">PROPAGATION_REQUIRED</prop>
            <prop key="update*">PROPAGATION_REQUIRED</prop>
            <prop key="remove*">PROPAGATION_REQUIRED</prop>
            <prop key="bulkUpdate*">PROPAGATION_REQUIRED</prop>
            <prop key="*">PROPAGATION_SUPPORTS,readOnly</prop>
        </props>
    </property>
    </bean>

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

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

    <bean id="dataSource" class="info.ems.datasource.DataSourceFactory">
    <property name="driverClassName" value="${database.driver}"/>
    <property name="url" value="${database.url}"/>
    <property name="username" value="${database.username}"/>
    <property name="password" value="${database.password}"/>
    <property name="validationQuery" value="${database.validationQuery}"/>
    <property name="dataSourceJndiName" value="${database.datasource.jndiname}"/>
    </bean>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="configLocation">
            <value>/WEB-INF/hibernate.cfg.xml</value>
        </property>
    <property name="configurationClass">
        <value>org.hibernate.cfg.AnnotationConfiguration</value>
        </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.current_session_context_class">org.hibernate.context.ThreadLocalSessionContext</prop>
        </props>
    </property>
    </bean>

    <bean id="dao" class="info.ems.hibernate.HibernateEMSDao" init-method="createSchema">
    <property name="hibernateTemplate">
        <bean class="org.springframework.orm.hibernate3.HibernateTemplate">
            <property name="sessionFactory" ref="sessionFactory"/>
        </bean>
    </property>
    <property name="schemaHelper">
        <bean class="info.ems.hibernate.SchemaHelper">
            <property name="driverClassName" value="${database.driver}"/>
            <property name="url" value="${database.url}"/>
            <property name="username" value="${database.username}"/>
            <property name="password" value="${database.password}"/>
            <property name="hibernateDialect" value="${hibernate.dialect}"/>
            <property name="dataSourceJndiName" value="${database.datasource.jndiname}"/>
        </bean>
    </property>
    </bean>
</beans>

我想知道：


在Spring之前处理数据库事务是否正确的配置？
是否需要将TransactionProxyFactoryBean与<tx:annotation-driven />一起使用？


我可以获取示例的任何信息或Web链接都将非常有帮助。

谢谢并恭祝安康。

编辑：从skaffman获得修改后的appliactionContext.xml的建议后：

<?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:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

    <bean class="info.ems.config.EMSConfigurer"/>

    <bean id="passwordEncoder" class="org.acegisecurity.providers.encoding.Md5PasswordEncoder"/>

    <bean id="ems" class="info.ems.EMSImpl" init-method="init">
            <property name="dao" ref="dao"/>
            <property name="passwordEncoder" ref="passwordEncoder"/>
            <property name="localeList" value="${ems.locales}"/>
            <property name="releaseVersion" value="${ems.version}"/>
            <property name="releaseTimestamp" value="${ems.timestamp}"/>
            <property name="emsHome" value="${ems.home}"/>
    </bean>

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

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

    <bean id="dataSource" class="info.ems.datasource.DataSourceFactory">
    <property name="driverClassName" value="${database.driver}"/>
    <property name="url" value="${database.url}"/>
    <property name="username" value="${database.username}"/>
    <property name="password" value="${database.password}"/>
    <property name="validationQuery" value="${database.validationQuery}"/>
    <property name="dataSourceJndiName" value="${database.datasource.jndiname}"/>
    </bean>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="configLocation">
            <value>/WEB-INF/hibernate.cfg.xml</value>
        </property>
    <property name="configurationClass">
        <value>org.hibernate.cfg.AnnotationConfiguration</value>
        </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.current_session_context_class">org.hibernate.context.ThreadLocalSessionContext</prop>
        </props>
    </property>
    </bean>

    <bean id="dao" class="info.ems.hibernate.HibernateEMSDao" init-method="createSchema">
    <property name="hibernateTemplate">
        <bean class="org.springframework.orm.hibernate3.HibernateTemplate">
            <property name="sessionFactory" ref="sessionFactory"/>
        </bean>
    </property>
    <property name="schemaHelper">
        <bean class="info.ems.hibernate.SchemaHelper">
            <property name="driverClassName" value="${database.driver}"/>
            <property name="url" value="${database.url}"/>
            <property name="username" value="${database.username}"/>
            <property name="password" value="${database.password}"/>
            <property name="hibernateDialect" value="${hibernate.dialect}"/>
            <property name="dataSourceJndiName" value="${database.datasource.jndiname}"/>
        </bean>
    </property>
    </bean>
</beans>

最佳答案

在Spring之前处理数据库事务是否正确的配置？


这是完全有效的，但是令人困惑并且重复工作。这可能会产生两层事务代理，尽管我怀疑这样做的行为会有所不同。

如您所说，您可能不想同时使用TransactionProxyFactoryBean和<tx:annotation-driven />。

您的TransactionProxyFactoryBean配置使用外部化的方法名称模式来确定哪些方法获得哪种事务语义。很好，尽管使用Spring的当前版本通常更容易使用注释而不是transactionAttributes上的TransactionProxyFactoryBean属性。

给定您的配置，我建议您摆脱显式的TransactionProxyFactoryBean bean定义（<tx:annotation-driven />将根据需要在幕后创建自己的一个）。将其替换为未修饰的EMSImpl，然后<tx:annotation-driven />将自动生成事务代理。