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// file : odb/mssql/view-result.txx
// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
// license : ODB NCUEL; see accompanying LICENSE file
#include <odb/callback.hxx>
#include <odb/exceptions.hxx> // result_not_cached
#include <odb/mssql/exceptions.hxx> // long_data_reload
#include <odb/mssql/view-statements.hxx>
namespace odb
{
namespace mssql
{
template <typename T>
view_result_impl<T>::
~view_result_impl ()
{
change_callback_type& cc (statements_.image ().change_callback_);
if (cc.context == this)
{
cc.callback = 0;
cc.context = 0;
}
if (!this->end_)
statement_->free_result ();
delete image_copy_;
}
template <typename T>
view_result_impl<T>::
view_result_impl (const query_base&,
details::shared_ptr<select_statement> statement,
statements_type& statements)
: base_type (statements.connection ().database ()),
statement_ (statement),
statements_ (statements),
use_copy_ (false),
image_copy_ (0)
{
}
template <typename T>
void view_result_impl<T>::
load (view_type& view)
{
if (!can_load_)
throw long_data_reload ();
odb::database& db (this->database ());
view_traits::callback (db, view, callback_event::pre_load);
view_traits::init (view,
use_copy_ ? *image_copy_ : statements_.image (),
&db);
// If we are using a copy, make sure the callback information for
// long data also comes from the copy.
//
can_load_ = !statement_->stream_result (
use_copy_ ? &statements_.image () : 0,
use_copy_ ? image_copy_ : 0);
view_traits::callback (db, view, callback_event::post_load);
}
template <typename T>
void view_result_impl<T>::
next ()
{
can_load_ = true;
this->current (pointer_type ());
typename view_traits::image_type& im (statements_.image ());
change_callback_type& cc (im.change_callback_);
if (cc.context == this)
{
cc.callback = 0;
cc.context = 0;
}
use_copy_ = false;
if (im.version != statements_.image_version ())
{
binding& b (statements_.image_binding ());
view_traits::bind (b.bind, im);
statements_.image_version (im.version);
b.version++;
}
if (statement_->fetch () == select_statement::no_data)
{
statement_->free_result ();
this->end_ = true;
}
else
{
cc.callback = &change_callback;
cc.context = this;
}
}
template <typename T>
void view_result_impl<T>::
cache ()
{
}
template <typename T>
std::size_t view_result_impl<T>::
size ()
{
throw result_not_cached ();
}
template <typename T>
void view_result_impl<T>::
change_callback (void* c)
{
view_result_impl<T>* r (static_cast<view_result_impl<T>*> (c));
typename view_traits::image_type& im (r->statements_.image ());
if (r->image_copy_ == 0)
r->image_copy_ = new typename view_traits::image_type (im);
else
*r->image_copy_ = im;
im.change_callback_.callback = 0;
im.change_callback_.context = 0;
r->use_copy_ = true;
}
}
}
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