Hibernate事务的滥用-hakulamatata-ChinaUnix博客

假设我现在查出所有用户，并对某些用户进行了操作，但这些操作我不想更新数据库，也就是我只是操作缓存，来计算他们的奖金。

计算完成奖金后，该方法结束。

事务结束.

以上操作的结果是，数据库记录被更新了。因为在一个事务里，但其实我只是想试操作用户的数据而不想更新。但为什么更新了，这就要问Hibernate了，对是这家伙干的

好事，Hibernate发现查出了所有用户的List,并把所有用户都放在Hibernate缓存中了。如果在一个事务中，你对该List里的用户操作了，并且他发现了你的操作，他会自动更新数

据库。
但我现在不想让他更新数据库，并且我的计算奖金算法看上去没有必要用事务。是的他根本没有必要用试务，因为他不更新，不保存，他只是算奖金。

所以解决这个问题的方法就是不要用管理器中对该Service进行管理.

现在想想为什么我们不用事务，Hibernate就不自动更新数据库了? 原因很简单，因为当我们查出所有用户之后Hibernate还做了件事,Session.close();
当他调用了Session.close()方法时，我们查询的List就变成了游离对象了，这时该List已不在Hibernate缓存中，这时你可以方便的设置和更新了，只不手动设用Update

Hibernate是不会帮你更新的^_^。当然也可以使用evict方法把对象变为游离。

呵呵，可是在一个事务中，就算你把他变成游离，Hibernate还是会自动更新的。(我试过)不过估计Hibernate应该有设置在一个事务内不自动更新的参数吧？

三、Hibernate事Spring事务配置说明:
我下面用的是 [指定对满足哪些bean name的bean自动生成事务代理]，这里看清楚点是name，也就是说这样写:
userInfoService
表示在Spring上下文中有userInfoService实例，并且这个实例必需对应这样一个接口UserInfoService，这时Spring才会自动为其配置Hibernate事务，否则会报错

[org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy14] to required type ]，
错误的意思是找不到对应的接口。

四、下面是我的Spring配置文件






     com/insurance/model/base/UserInfo.hbm.xml
     com/insurance/model/base/Base.hbm.xml
     com/insurance/model/base/AdminInfo.hbm.xml
     com/insurance/model/base/CompanyInfo.hbm.xml
     com/insurance/model/base/BxCom.hbm.xml
     com/insurance/model/base/XzInfo.hbm.xml
     com/insurance/model/base/ClientInfo.hbm.xml
     com/insurance/model/base/UserGrade.hbm.xml
     com/insurance/model/base/UserMoneyLog.hbm.xml
     com/insurance/model/base/SxBdInfo.hbm.xml
     com/insurance/model/base/CxBdInfo.hbm.xml
     com/insurance/model/base/CarBdInfo.hbm.xml
     com/insurance/model/base/SelectBase.hbm.xml
     com/insurance/model/base/PayInfo.hbm.xml
     com/insurance/model/base/AwardInfo.hbm.xml





                    ${hibernate.dialect}
   true
       ${hibernate.show_sql}
   org.hibernate.hql.classic.ClassicQueryTranslatorFactory
                   ${hibernate.hbm2ddl.auto}
                ${hibernate.jdbc.batch_size}
                ${hibernate.jdbc.fetch_size}














       PROPAGATION_REQUIRED,readOnly
      PROPAGATION_REQUIRED

            userInfoService
            adminInfoService
            pageService
            companyInfoService
            xzInfoService
            baseService
            clientInfoService
            userGradeService
            userMoneyLogService
            sxBdInfoService
            cxBdInfoService
            carBdInfoService










                transactionInterceptor

五、下面是详细的错误信息
2008-05-23 09:07:22,046 [org.springframework.web.context.ContextLoader]-[ERROR] Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'accountAddPay' defined in ServletContext resource [/WEB-

INF/classes/applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyAccessExceptionsException:

PropertyAccessExceptionsException (1 errors); nested propertyAccessExceptions are: [org.springframework.beans.TypeMismatchException: Failed to convert

property value of type [$Proxy14] to required type [com.insurance.service.pay.AccountSellPay] for property 'accountSellPay']
PropertyAccessExceptionsException (1 errors)
org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy14] to required type

initialization started
2008-05-23 09:07:22,906 [org.springframework.web.struts.ContextLoaderPlugIn]-[ERROR] Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'accountAddPay' defined in ServletContext resource [/WEB-

INF/classes/applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyAccessExceptionsException:

PropertyAccessExceptionsException (1 errors); nested propertyAccessExceptions are: [org.springframework.beans.TypeMismatchException: Failed to convert

[com.insurance.service.pay.AccountSellPay] for property 'accountSellPay'
        at org.springframework.beans.BeanWrapperImpl.doTypeConversionIfNecessary(BeanWrapperImpl.java:951)
        at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:692)
        at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:572)
        at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:737)
        at org.springframework.beans.BeanWrapperImpl.setPropertyValues(BeanWrapperImpl.java:764)
        at org.springframework.beans.BeanWrapperImpl.setPropertyValues(BeanWrapperImpl.java:753)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1057)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:857)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:378)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:233)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:145)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:283)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:313)
        at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:139)
        at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)
        at org.springframework.web.context.ContextLoaderServlet.init(ContextLoaderServlet.java:83)
        at javax.servlet.GenericServlet.init(GenericServlet.java:211)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1019)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:862)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3991)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4335)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
        at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)
        at org.apache.catalina.core.StandardHost.install(StandardHost.java:832)
        at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:683)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:964)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
        at org.apache.catalina.core.StandardService.start(StandardService.java:476)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:2298)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:284)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:422)
javax.servlet.UnavailableException
        at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:880)
        at org.apache.struts.action.ActionServlet.init(ActionServlet.java:336)
        at com.insurance.struts.action.ActionInit.init(ActionInit.java:34)
        at javax.servlet.GenericServlet.init(GenericServlet.java:211)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1019)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:862)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3991)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4335)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
        at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)
        at org.apache.catalina.core.StandardHost.install(StandardHost.java:832)
        at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:683)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:964)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
        at org.apache.catalina.core.StandardService.start(StandardService.java:476)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:2298)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:284)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:422)
2008-5-23 9:07:23 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2008-5-23 9:07:23 org.apache.jk.common.ChannelSocket init
信息: JK2: ajp13 listening on /0.0.0.0:8009
2008-5-23 9:07:23 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/32 config=D:\Tomcat5.0\conf\jk2.properties
2008-5-23 9:07:23 org.apache.catalina.startup.Catalina start
信息: Server startup in 6953 ms

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