谢谢大家，只能开启两个事务来解决啦。 在 2010年12月16日 下午6:11，kartik kudada <[email protected]>写道：
> If following operation throws an exception,we can not rollback the first > transaction, because it is already committed. What I can think of right now > is, you can manually delete it. but it is not the genuine solution. > > Why don't you create owned relation between these two table? > Tell me about your thoughts? > > Regards, > Kartik > > 2010/12/16 Liang Ding <[email protected]> > > Hi, kartik. >> It works, but how can I rollback the 'first transaction' if the following >> operations throws an exception? >> >> 2010/12/16 kartik kudada <[email protected]> >> >>> You can not operate on two entities in single transaction unless both are >>> entity groups. >>> First delete CityNum in one transaction and then delete ScheduleProcess >>> in different transaction, >>> >>> >>> >>> >>> >>> >>> >>> >>> 2010/12/16 EtuO <[email protected]> >>> >>>> Caused by: java.lang.IllegalArgumentException: can't operate on >>>> >>>> multiple entity groups in a single transaction. found both Element { >>>> type: "CityNum" >>>> name: "013001" >>>> } >>>> and Element { >>>> type: "ScheduleProcess" >>>> name: "013001" >>>> } >>>> >>>> at >>>> >>>> com.google.appengine.api.datastore.DatastoreApiHelper.translateError(DatastoreApiHelper.java: >>>> 36) >>>> at com.google.appengine.api.datastore.DatastoreApiHelper >>>> $1.convertException(DatastoreApiHelper.java:98) >>>> at >>>> com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java: >>>> 69) >>>> at com.google.appengine.api.datastore.FutureHelper >>>> $CumulativeAggregateFuture.get(FutureHelper.java:136) >>>> at com.google.appengine.api.datastore.FutureHelper >>>> $TxnAwareFuture.get(FutureHelper.java:213) >>>> at >>>> com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java: >>>> 67) >>>> at >>>> >>>> com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java: >>>> 71) >>>> at >>>> >>>> com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java: >>>> 58) >>>> at >>>> >>>> com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java: >>>> 55) >>>> at >>>> >>>> org.datanucleus.store.appengine.RuntimeExceptionWrappingDatastoreService.get(RuntimeExceptionWrappingDatastoreService.java: >>>> 64) >>>> ... 86 more >>>> >>>> 实现类代码： >>>> /** >>>> * @see >>>> >>>> org.ertuo.taoplugin.facade.TransactionOperation#nestTrans(java.lang.Object[]) >>>> */ >>>> public void nestTrans(Object... objects) { >>>> String id = (String) objects[0]; >>>> CityNum cn = cityNumDao.get(id); >>>> ScheduleProcess sp = scheduleDao.get(id); >>>> cityNumDao.delete(cn); >>>> scheduleDao.delete(sp); >>>> logger.info("id[" + id + "]对应的城市和任务删除完毕"); >>>> } >>>> >>>> 接口代码： >>>> /** >>>> * 事务性操作接口 >>>> * @author mo.duanm >>>> * @version $Id: TransactionOperation.java, v 0.1 2010-12-16 下午 >>>> 05:22:23 mo.duanm Exp $ >>>> */ >>>> public interface TransactionOperation { >>>> >>>> /** >>>> * 嵌套事务 >>>> * @param objects >>>> */ >>>> @Transactional >>>> public void nestTrans(Object... objects); >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Google App Engine for Java" group. >>>> To post to this group, send email to >>>> [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]<google-appengine-java%[email protected]> >>>> . >>>> For more options, visit this group at >>>> http://groups.google.com/group/google-appengine-java?hl=en. >>>> >>>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Google App Engine for Java" group. >>> To post to this group, send email to >>> [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]<google-appengine-java%[email protected]> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/google-appengine-java?hl=en. >>> >> >> >> >> -- >> My Blog: http://blog.csdn.net/DL88250 >> -------------------------------------------------------- >> Open Source, Open Mind, Open Sight, Open Future! >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine for Java" group. >> To post to this group, send email to >> [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<google-appengine-java%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. 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