[sqlalchemy] Re: Cannot abort wxPython thread with SQLAlchemy
Thanks Peter for your answer. On 11 juin, 16:16, Peter Hansen [EMAIL PROTECTED] wrote: Aside from that, you don't have many options. What about changing the query so that it will return its results in increments, rather than all at once? If it's a long-running query but you can break it up that way, then the check event flag approach you're using would be able to work. -Peter That's exactly what I am going to do. Many thanks for your help Dominique --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Cannot abort wxPython thread with SQLAlchemy
Dominique wrote: On 10 juin, 02:38, Peter Hansen [EMAIL PROTECTED] wrote: As Python has no way to actually terminate a thread, can you explain what you mean by stop this thread? Are you simply cloning the code from the wxPython example, with the delayedresult.AbortEvent() object, and calling .set() on it? That's exactly what I do. My Abort button is linked to an abort function which calls abortEvent.set(), like in the demo. In the producer function, I launch the query. What I'd like to do is to be able to stop the thread, while the query is being done. Is it possible or am I trying to do something impossible ? As no one else has chimed in, I'll go out on a limb a bit and say that it's impossible. Python itself definitely doesn't have any way to forcibly kill a thread, at least not one that is buried in an external call (e.g. in the sqlite library). There is a mechanism that's been added in recent versions that can terminate (under certain conditions) pure Python code in another thread by asynchronously raising an exception: search for python asynchronous exception and make sure you understand the issues before trying to use it. If you could restructure your application so the long-running query occurs in a separate process, you could kill the process using operating system support for that, though perhaps not in a clean fashion. Aside from that, you don't have many options. What about changing the query so that it will return its results in increments, rather than all at once? If it's a long-running query but you can break it up that way, then the check event flag approach you're using would be able to work. -Peter --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Cannot abort wxPython thread with SQLAlchemy
Dominique wrote: I am using delayedresult (which is a class to do threading in wxPython) for a query with SQLAlchemy, using SQLite. I have an 'opened' session in the main App thread. I create another session under the delayedresult thread. When I try to stop this thread with a dedicated button, the thread doesn't abort and goes on till it sends the result. As Python has no way to actually terminate a thread, can you explain what you mean by stop this thread? Are you simply cloning the code from the wxPython example, with the delayedresult.AbortEvent() object, and calling .set() on it? -Peter --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Cannot abort wxPython thread with SQLAlchemy
Hi Peter, Thank you very much for answering. On 10 juin, 02:38, Peter Hansen [EMAIL PROTECTED] wrote: As Python has no way to actually terminate a thread, can you explain what you mean by stop this thread? Are you simply cloning the code from the wxPython example, with the delayedresult.AbortEvent() object, and calling .set() on it? That's exactly what I do. My Abort button is linked to an abort function which calls abortEvent.set(), like in the demo. In the producer function, I launch the query. What I'd like to do is to be able to stop the thread, while the query is being done. Is it possible or am I trying to do something impossible ? Thanks Dominique --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
