java - Spring 和 hibernate : non transactional service methods

Question

我希望我的读取方法不使用事务，因为根本不需要事务，我只用 @Transactional 标记我的创建/更新方法。但我该怎么做呢？我有一个非常基本的 Spring 配置等等...

SessionFactory 被注入(inject)到我的 DAO 中，并且在每个方法中我调用 sessionFactory.getCurrentSession().doQueryStuff();

但这会导致此错误:

org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here

如果您需要我的 Spring 配置:

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:oxm="http://www.springframework.org/schema/oxm"
xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    http://www.springframework.org/schema/oxm
    http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util-3.0.xsd">

<context:annotation-config />
<context:component-scan base-package="be.howest.kidscalcula" />
<mvc:annotation-driven />

<bean id="viewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix">
        <value>/WEB-INF/views/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>


<bean id="myDataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost/kidscalcula" />
    <property name="username" value="root" />
    <property name="password" value="" />
</bean>

<bean class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
    id="sessionFactory">
    <property name="dataSource" ref="myDataSource" />
    <property name="mappingResources">
        <list>
            <value>be/howest/kidscalcula/model/Foto.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Kindleerplanonderdeel.hbm.xml
            </value>
            <value>be/howest/kidscalcula/model/Klas.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Leerkracht.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Leerling.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Leerplan.hbm.xml</value>
            <value>be/howest/kidscalcula/model/LeerplanOefenreeks.hbm.xml
            </value>
            <value>be/howest/kidscalcula/model/Leerplanonderdeel.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Niveau.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Oefenreeks.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Overgangsregel.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Rapport.hbm.xml</value>
            <value>be/howest/kidscalcula/model/RapportLeerplanonderdeel.hbm.xml
            </value>
            <value>be/howest/kidscalcula/model/Schooljaar.hbm.xml</value>
            <value>be/howest/kidscalcula/model/Subonderdeel.hbm.xml</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.connection.pool_size">3</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.use_sql_comments">true</prop>
            <prop key="hibernate.cache.use_second_level_cache">false</prop>

        </props>
    </property>
</bean>

<!-- Configure the multipart resolver -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!-- one of the properties available; the maximum file size in bytes -->
    <property name="maxUploadSize" value="500000" />
</bean>


<!--
    Transaction manager for a single Hibernate SessionFactory (alternative
    to JTA)
-->
<bean id="transactionManager"
    class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory">
        <ref bean="sessionFactory" />
    </property>
</bean>

<tx:annotation-driven />

这个错误与传播是标准必需的事实有什么关系吗？

Answer 1

将方法标记为事务性且只读，以确保事务不会修改任何数据:

@Transactional(readOnly=true)

当使用 Hibernate 时，这是一个有用的优化。要了解有关此注释的含义的更多信息，这里有一篇很棒的文章: Read-Only transactions with Spring and Hibernate