Re: [appengine-java] gae不支持事务？
The important thing is can't rollback while error occurred.
2010/12/16 EtuO
> 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 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
>>
>> Hi, kartik.
>>> It works, but how can I rollback the 'first transaction' if the following
>>> operations throws an exception?
>>>
>>> 2010/12/16 kartik kudada
>>>
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
> 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);
>
> --
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>>>
>>>
>>>
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Re: [appengine-java] gae不支持事务？
As article on http://www.keakon.net/article/1843 suggests , you can create
task queue on successful completion of 1st transaction , same can be done
when exception occurred in 1st transaction.
I did not try this solution but it seems like good option.
By this way we can achieve atomicity like in banking example .
2010/12/16 风笑雪
> 不能rollback，但可以roll forward。
> 这篇可能对你有帮助：
> http://www.keakon.net/article/1843
>
> --
> keakon
>
> My blog(Chinese): www.keakon.net
> Blog source code: https://bitbucket.org/keakon/doodle/
>
>
>
> 2010/12/16 EtuO
>
>> 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 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
>>>
>>> Hi, kartik.
It works, but how can I rollback the 'first transaction' if the
following operations throws an exception?
2010/12/16 kartik kudada
> 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
>
>> 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
>> google-appengine-j...@googlegroups.com.
>> To unsubscribe from this group, send email to
>> google-appengine-java+unsubscr...@googlegroups.com
>> .
>> For more options, visit this group at
>> http://groups.google.com/group/google-appengine-java?hl=en.
>>
>>
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--
My Blog: http://blog.csdn.net/DL88250
Re: [appengine-java] gae不支持事务？
不能rollback，但可以roll forward。
这篇可能对你有帮助：
http://www.keakon.net/article/1843
--
keakon
My blog(Chinese): www.keakon.net
Blog source code: https://bitbucket.org/keakon/doodle/
2010/12/16 EtuO
> 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 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
>>
>> Hi, kartik.
>>> It works, but how can I rollback the 'first transaction' if the following
>>> operations throws an exception?
>>>
>>> 2010/12/16 kartik kudada
>>>
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
> 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
> google-appengine-j...@googlegroups.com.
> To unsubscribe from this group, send email to
> google-appengine-java+unsubscr...@googlegroups.com
> .
> For more options, visit this group at
> http://groups.google.com/group/google-appengine-java?hl=en.
>
>
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>>>
>>>
>>>
>>> --
>>> 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.
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>>> .
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Re: [appengine-java] gae不支持事务？
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 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
>
> Hi, kartik.
>> It works, but how can I rollback the 'first transaction' if the following
>> operations throws an exception?
>>
>> 2010/12/16 kartik kudada
>>
>>> 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
>>>
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);
--
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>>>
>>
>>
>>
>> --
>> 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
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>>
>
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Re: [appengine-java] gae不支持事务？
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
> Hi, kartik.
> It works, but how can I rollback the 'first transaction' if the following
> operations throws an exception?
>
> 2010/12/16 kartik kudada
>
>> 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
>>
>>> 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
>>> google-appengine-j...@googlegroups.com.
>>> To unsubscribe from this group, send email to
>>> google-appengine-java+unsubscr...@googlegroups.com
>>> .
>>> For more options, visit this group at
>>> http://groups.google.com/group/google-appengine-java?hl=en.
>>>
>>>
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>>
>
>
>
> --
> My Blog: http://blog.csdn.net/DL88250
>
> Open Source, Open Mind, Open Sight, Open Future!
>
> --
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Re: [appengine-java] gae不支持事务？
Hi, kartik.
It works, but how can I rollback the 'first transaction' if the following
operations throws an exception?
2010/12/16 kartik kudada
> 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
>
>> 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);
>>
>> --
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>>
>>
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Re: [appengine-java] gae不支持事务？
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
> 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
> google-appengine-j...@googlegroups.com.
> To unsubscribe from this group, send email to
> google-appengine-java+unsubscr...@googlegroups.com
> .
> For more options, visit this group at
> http://groups.google.com/group/google-appengine-java?hl=en.
>
>
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Re: [appengine-java] gae不支持事务？
支持事务，但是不能在同一个事务中操作属于不同实体组的实体。
2010/12/16 EtuO
> 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
> google-appengine-j...@googlegroups.com.
> To unsubscribe from this group, send email to
> google-appengine-java+unsubscr...@googlegroups.com
> .
> 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!
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[appengine-java] gae不支持事务？
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);
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