Hi Koen,
Thanks it works great now.
I've noticed another issues with QueryModel.
I don't know if i'm doing something wrong, but here is the scenario:
I have something like this:
class A
{
template <typename Action>
void persist(Action &a)
{
dbo::hasMany(a, m_Cs, dbo::ManyToOne, "a");
}
dbo::collection< dbo::ptr<C> > m_Cs;
};
class B
{
template <typename Action>
void persist(Action &a)
{
dbo::hasMany(a, m_Cs, dbo::ManyToOne, "b");
}
dbo::collection< dbo::ptr<C> > m_Cs;
};
class C
{
template <typename Action>
void persist(Action &a)
{
dbo::belongsTo(a, m_A "a");
dbo::belongsTo(a, m_B "b");
}
dbo::ptr<A> m_A;
dbo::ptr<B> m_B;
};
Next i have a WTabWidget with three tabs displaying the three tables above,
using WTableView and QueryModel<A>, QueryModel<B> and QueryModel<C>.
Initial/current widget is table A.
After initially shown table A, i click on tab with table B, table B is shown
correctly;
But after initially shown table A, i click on tab with table C, and after
that i try to click the tab with table B, an exception is thrown and session
dies.
The exception is std::logic_error("Dbo load(): no active transaction"),
thrown by Session::implLoad (Dbo/Session_impl.h line number:316).
The call stack is something like this:
Wt::Dbo::Session::implLoad<User>(Wt::Dbo::MetaDbo<User> & dbo={...},
Wt::Dbo::SqlStatement * statement=0x00000000, int & column=0) Line 316 C++
Wt::Dbo::MetaDbo<User>::doLoad() Line 208 C++
Wt::Dbo::MetaDbo<User>::obj() Line 174 C++
Wt::Dbo::ptr<User>::operator bool() Line 297 + 0x14 bytes C++
Wt::Dbo::ToAnysAction::visit<User>(const Wt::Dbo::ptr<User> & obj={...})
Line 510 + 0x8 bytes C++
Wt::Dbo::query_result_traits<Wt::Dbo::ptr<User> >::getValues(const
Wt::Dbo::ptr<User> & ptr={...},
std::vector<boost::any,std::allocator<boost::any> > &
values=[2]({content=0x05612d88 },{content=0x05612d40 })) Line 431 C++
Wt::Dbo::QueryModel<Wt::Dbo::ptr<User> >::setCurrentRow(int row=0) Line 138
+ 0x12 bytes C++
Wt::Dbo::QueryModel<Wt::Dbo::ptr<User> >::data(const Wt::WModelIndex &
index={...}, int role=6) Line 126 C++
Wt::WModelIndex::data(int role=6) Line 25 + 0x21 bytes C++
Wt::WItemDelegate::update(Wt::WWidget * widget=0x00000000, const
Wt::WModelIndex & index={...}, Wt::WFlags<enum Wt::ViewItemRenderFlag>
flags={...}) Line 120 + 0x40 bytes C++
Wt::WTableView::renderWidget(Wt::WWidget * widget=0x00000000, const
Wt::WModelIndex & index={...}) Line 315 + 0x24 bytes C++
Wt::WTableView::renderTable(const int fr=0, const int lr=0, const int fc=0,
const int lc=0) Line 639 + 0x53 bytes C++
Wt::WTableView::rerenderData() Line 764 C++
Wt::WTableView::render(Wt::WFlags<enum Wt::RenderFlag> flags={...}) Line
737 C++
.
.
.
As far as i could analyze it , it seems that when table C is fetched before
table B ( table C references the table B ), rows from B are not fully loaded
but cached, and when table B is shown QueryModel assumes that rows from
table B are fully loaded and query_result_traits::getValues call from
QueryModel::setCurrentRow fails.
I tried to wrap the call with Dbo::Transaction and it was working but i do
not know if this is the right way.
The call stack is copy & paste from Visual Studio 2008's call stack view.
Thanks
On Wed, Dec 1, 2010 at 2:03 PM, Koen Deforche <[email protected]> wrote:
> 2010/11/29 Zoran Angelov <[email protected]>:
> > Hi Koen,
> > I think that i've found 2 issues with Postgres dbo backend:
> > 1. When binding a bytearray (std::vector<unsigned char>) and the array is
> > empty, on inserting a new record ( PostgresStatement::bind
> postgre...@150
> > ), memcpy crashes the application.
> > Maybe zero-length check on bytearray is needed.
>
> Indeed! I've added this check.
>
> > 2. When retrieving the result of binded bytearray, after the bytearray
> has
> > been unescaped with PQunescapeBytea ( PostgresStatement::getResult
> > postgre...@384 ) freemem crashes the application.
> > I think that memory allocated by PQunescapeBytea needs to be freed
> with
> > PQfreemem. I tried with PQfreemem and there was no crash.
>
> I cannot recall anymore why I don't use PQfreemem there, apparently it
> doesn't make a difference on linux/Unix.
>
> Both issues will be fixed soon in our git repo.
>
> Regards,
> koen
>
>
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