Write operations are not allowed in read-only mode 只读模式下(FlushMode.NEVER/MANUAL)写操作不允
2012-06-20 17:31
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org.springframework.dao.InvalidDataAccessApiUsageException:Write operations are not allowed in read-only mode (FlushMode.NEVER/MANUAL):Turn your Session into FlushMode.COMMIT/AUTO or remove 'readOnly' marker fromtransaction
definition.
问题:只读模式下(FlushMode.NEVER/MANUAL)写操作不被允许:把你的Session改成FlushMode.COMMIT/AUTO或者清除事务定义中的readOnly标记。
错误原因:
OpenSessionInViewFilter在getSession的时候,会把获取回来的session的flush
mode 设为FlushMode.NEVER。然后把该sessionFactory绑定到TransactionSynchronizationManager,使request的整个过程都使用同一个session,在请求过后再接除该sessionFactory的绑定,最后closeSessionIfNecessary根据该session是否已和transaction绑定来决定是否关闭session。在这个过程中,若HibernateTemplate发现自当前session有不是readOnly的transaction,就会获取到FlushMode.AUTOSession,使方法拥有写权限。也即是,如果有不是readOnly的transaction就可以由Flush.NEVER转为Flush.AUTO,拥有insert,update,delete操作权限,如果没有transaction,并且没有另外人为地设flush
model的话,则doFilter的整个过程都是Flush.NEVER。所以受transaction(声明式的事务)保护的方法有写权限,没受保护的则没有。
解决方法:
web.xml配置里添加
<filter>
<filter-name>OpenSessionInViewFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
</filter-class>
<init-param>
<param-name>sessionFactoryBeanName</param-name>
<param-value>sessionFactory</param-value>
</init-param>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name> flushMode</param-name>
<param-value>AUTO</param-value>
</init-param>
</filter>
// 。。。。
<filter-mapping>
<filter-name>OpenSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
如果在交给spring
管理的情况下,在beans.xml
里的配置
<beanid="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory"ref="sessionFactory" />
</bean>
<aop:config>
<aop:pointcut id="bussinessService"
expression="execution(*com.fan.service.base.*.*(..))" />
<aop:advisor pointcut-ref="bussinessService"
advice-ref="txAdvice" />
</aop:config>
<tx:adviceid="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="get*"read-only="false" propagation="NOT_SUPPORTED"/>
<tx:method name="find*"read-only="false" propagation="NOT_SUPPORTED"/>
<tx:method name="save*"propagation="REQUIRED"/> // 如果不把saveupdate delete都配置上,
<tx:method name="update*"propagation="REQUIRED"/> //这些操作会无效
<tx:method name="delete*"propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
definition.
问题:只读模式下(FlushMode.NEVER/MANUAL)写操作不被允许:把你的Session改成FlushMode.COMMIT/AUTO或者清除事务定义中的readOnly标记。
错误原因:
OpenSessionInViewFilter在getSession的时候,会把获取回来的session的flush
mode 设为FlushMode.NEVER。然后把该sessionFactory绑定到TransactionSynchronizationManager,使request的整个过程都使用同一个session,在请求过后再接除该sessionFactory的绑定,最后closeSessionIfNecessary根据该session是否已和transaction绑定来决定是否关闭session。在这个过程中,若HibernateTemplate发现自当前session有不是readOnly的transaction,就会获取到FlushMode.AUTOSession,使方法拥有写权限。也即是,如果有不是readOnly的transaction就可以由Flush.NEVER转为Flush.AUTO,拥有insert,update,delete操作权限,如果没有transaction,并且没有另外人为地设flush
model的话,则doFilter的整个过程都是Flush.NEVER。所以受transaction(声明式的事务)保护的方法有写权限,没受保护的则没有。
解决方法:
web.xml配置里添加
<filter>
<filter-name>OpenSessionInViewFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
</filter-class>
<init-param>
<param-name>sessionFactoryBeanName</param-name>
<param-value>sessionFactory</param-value>
</init-param>
<init-param>
<param-name>singleSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name> flushMode</param-name>
<param-value>AUTO</param-value>
</init-param>
</filter>
// 。。。。
<filter-mapping>
<filter-name>OpenSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
如果在交给spring
管理的情况下,在beans.xml
里的配置
<beanid="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory"ref="sessionFactory" />
</bean>
<aop:config>
<aop:pointcut id="bussinessService"
expression="execution(*com.fan.service.base.*.*(..))" />
<aop:advisor pointcut-ref="bussinessService"
advice-ref="txAdvice" />
</aop:config>
<tx:adviceid="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="get*"read-only="false" propagation="NOT_SUPPORTED"/>
<tx:method name="find*"read-only="false" propagation="NOT_SUPPORTED"/>
<tx:method name="save*"propagation="REQUIRED"/> // 如果不把saveupdate delete都配置上,
<tx:method name="update*"propagation="REQUIRED"/> //这些操作会无效
<tx:method name="delete*"propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
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