[Interest] QThreadPool & writing to the DB
xbenlau at gmail.com
Thu Aug 28 09:55:18 CEST 2014
On 18 August 2014 19:51, Igor Mironchik <igor.mironchik at gmail.com> wrote:
> Well, but with SQLite this approach works...
> -----Original Message-----
> From: Sze Howe Koh
> Sent: Monday, August 18, 2014 12:57 PM
> To: Igor Mironchik
> Subject: Re: [Interest] QThreadPool & writing to the DB
> Hi Igor,
> On 18 August 2014 14:26, Igor Mironchik <igor.mironchik at gmail.com> wrote:
> > Hi.
> > I want to move write to DB operation to another thread (from the GUI
> > thread). And I implemented the following QRunnable:
> > Is it OK to launch this runnable every time when I need to write to the
> > log?
> > And what if previous operation is still not finished and I will launch
> > another?
> According to http://qt-project.org/doc/qt-5/threads-modules.html, your
> queries must be made from the same thread which opened the database
> connection. You cannot use QRunnable, because it doesn't let you
> choose which thread to use.
> If you want to make queries in another thread, you must create a
> QSqlDatabase in that thread, and associate every QSqlQuery with that
> QSqlDatabase. Then, run every query from that same thread.
> See the QThread documentation for examples on how to set up your
> thread: http://qt-project.org/doc/qt-5/QThread.html
> Interest mailing list
> Interest at qt-project.org
btw , I have made an implementation that hold a thread and accept QRunnable
on main thread then run it on the created thread. You may take it as a
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