hibernate session.flush with spring @transactional

Question

我在我的应用程序中使用spring和hibernate并使用spring事务.

所以我在方法和带有数据库查询方法的DAO层上有注释@transaction的服务层.

@Transactional(readOnly = false)
public void get(){

}

问题是当我想在数据库中保存一个对象时,我必须@Transaction在DAO层方法结束时使用.为什么？

我想如果我有注释@ transaction,那么spring应该在完成服务方法时自动提交事务.

DAO层:

public BaseEntity saveEntity(BaseEntity entity) throws Exception {
        try {
            Session session = sessionFactory.getCurrentSession();
            session.saveOrUpdate(entity);
            session.flush();
        } catch (HibernateException he) {
            throw new Exception("Failed to save entity " + entity);
        }
        return entity;
    }

服务层:

    @Transactional(readOnly = false)
    public BaseEntity saveEntity(BaseEntity entity) throws Exception {
        return dao.saveEntity(entity);
    }

弹簧配置:

<context:property-placeholder properties-ref="deployProperties" />

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

    <!-- Activate Spring Data JPA repository support -->
    <jpa:repositories base-package="com" />

    <!-- Declare a datasource that has pooling capabilities-->   
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close"
        p:driverClass="${app.jdbc.driverClassName}"
        p:jdbcUrl="${app.jdbc.url}"
        p:user="${app.jdbc.username}"
        p:password="${app.jdbc.password}"
        p:acquireIncrement="5"
        p:idleConnectionTestPeriod="60"
        p:maxPoolSize="100"
        p:maxStatements="50"
        p:minPoolSize="10" />

    <!-- Declare a JPA entityManagerFactory -->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" 
        p:persistenceXmlLocation="classpath*:META-INF/persistence.xml"
        p:persistenceUnitName="hibernatePersistenceUnit"
        p:dataSource-ref="dataSource"
        p:jpaVendorAdapter-ref="hibernateVendor"/>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
        p:dataSource-ref="dataSource" p:configLocation="${hibernate.config}"
        p:packagesToScan="com" />

    <!-- Specify our ORM vendor -->
    <bean id="hibernateVendor" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
                p:showSql="false"/>

    <!-- Declare a transaction manager-->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager" 
        p:entityManagerFactory-ref="entityManagerFactory"/>

Answer 1

是的，如果您拥有@TransactionalDAO方法，则无需手动刷新会话，如果该方法中的操作成功，则hibernate将在提交事务的过程中刷新会话。

检查此链接以了解@Transactional的工作原理- 春季-@Transactional-后台会发生什么？