Does anyone have a working example of how to use QueryModel to bind to
WComboBox or another like type of widget?
I could not find any examples and my guess below is not working.
I am trying to bind a single table with one column
class TheVideo
{
public:
TheVideo();
std::string categories; // categories for Combo box
std::string name; // Name for Combo box
template<class Action>
void persist(Action &a)
{
Wt::Dbo::field(a, categories, "categories");
Wt::Dbo::field(a, name, "name");
}
};
// My class is derived from Wt::Dbo::Session, I read from an XML file
and correctly populate the table in this class
Wt::Dbo::QueryModel< Wt::Dbo::ptr<TheVideo> > *model = new
Wt::Dbo::QueryModel< Wt::Dbo::ptr<TheVideo> >();
model->setQuery(query< Wt::Dbo::ptr<TheVideo> >("select u from video
u").where("categories = ?").bind("IAM"), false);
model->addColumn("name");
videoCombo.setModel(model);
I have several rows in the table with the categories = IAM, but
inspecting the model, currentRow_ = -1, I get a segment fault on
setModel.
Thanks
On Thu, 2014-03-13 at 08:27 -0700, Jason H wrote:
> Why wouldn't you just use a QSql[Query|Table]Model for the combo box?
> Or in Wt, a Wt::Dbo::QueryModel< Result >
>
> QXmlStreamReader is easy if the schema is easy. You just get elements as they
> occur.
>
>
>
>
> ________________________________
> From: Jeffrey Scott Flesher Gmail <jeffrey.scott.fles...@gmail.com>
> To: Wt <witty-interest@lists.sourceforge.net>
> Sent: Tuesday, March 11, 2014 7:23 PM
> Subject: [Wt-interest] Can you use XML or SQL as a data source for WComboBox?
>
>
>
> I do not see any examples of it, beside one very confusing forum thread, with
> no full example code, I did not find anything else, I am mostly interested in
> XML.
>
> My guess would be that I would use:
>
> combo = new WComboBox(this);
> WStandardItemModel *si = new WStandardItemModel();
>
> and use QXmlStreamReader to read in the data, and attach it with:
>
> WStandardItem *i = new WStandardItem();
> i->setData(p1.key, UserRole);
> i->setText(p1.name);
> si->appendRow(i);
>
> combo->setModel(si);
>
> Found this at
> http://andres.jaimes.net/799/how-to-use-a-combobox-with-cwt-witty/
>
> I can work on this and get it to work with no problem, but I was wondering if
> there is an easier way, or if this is the way to do it.
>
> Do you have a Wt class to read XML?
> or is QXmlStreamReader just as easy and fast?
>
> Thanks
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> this first edition is now available. Download your free book today!
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