Hi,
Michael is not the only one who recommends to write the business logic
in Qt/C++ and only the UI in QML.
It seems some people here got super excited by QML. And don't see
anymore when it stops being a good solution.
But what should I say...
... been there - done that - learned my lesson ;)
Cheers
Günter
On 06/13/2013 02:03 PM, mrqt...@gmail.com wrote:
>
> Michael, it seems like you kidding me. Or us. I am like C++ and from
> the first day of my work in RSS team I always speak about xml parsing
> in C++, models and so on. But answer always was "you must use qml
> where it's possible". And what now?! A lot of code already written
> with xmllistmodel and executeSql, even if that way was more complex
> then c++ realization.
>
>
> 13.06.13 15:39 Michael Zanetti ???????(?):
>
> Hi,
>
> At the risk that some people don't like to hear this, I would highly
> recommend
> to write the actual feed fetching and database storing part in C++/Qt
> and only
> expose a well defined model containing the RSS feeds to QML. Maybe one
> model
> per feed source or something like that.
>
> Writing all that SQL query stuff in javascript will end up being more
> complex
> and fail prone than writing a simple QML plugin in Qt.
>
> Br,
> Michael
>
> On Thursday 13 June 2013 11:34:59 Joey Chan wrote:
> > Hi Geeks,
> >
> > I'm a developer of RSS reader, I found a performance issue in qml
> database,
> > which blocks the main thread for seconds.
> >
> > *issue description:*
> > <code>
> > dbResult = tx.executeSql('INSERT INTO article (title, link, description,
> > pubdate, guid, feed_id) VALUES(?, ?, ?, ?, ?, ?)',
> > [title , link, description, pubdate, guid,
> > feed_id])
> > </code>
> > I use this code to insert a row of data into database, if just one row
> > needed, ok with that; but if I need many rows of data to be insert, the
> > database engine will execute this code many times and blocks the main
> > thread for seconds.
> >
> > *solution: *
> > 1. WorkScript. not support .import includes QtQuick.LocalStorage 2.0 >_<
> > 2. binding or batch execute. In Qt C++, a list can be binded to a
> > QSqlQuery, then only execute once to insert them into database, can
> anyone
> > teach how to do that in qml?
> > 3. U1DB. I haven't tried it, is it stable now?
> >
> >
> > Thanks,
> > Joey
>
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