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// file : odb/mysql/result.txx
// author : Boris Kolpackov <boris@codesynthesis.com>
// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#include <odb/exceptions.hxx>
namespace odb
{
namespace mysql
{
template <typename T>
result_impl<T>::
~result_impl ()
{
}
template <typename T>
result_impl<T>::
result_impl (const query&,
details::shared_ptr<select_statement> statement,
object_statements<object_type>& statements)
: odb::result_impl<T> (statements.connection ().database ()),
statement_ (statement),
statements_ (statements),
count_ (0)
{
}
template <typename T>
void result_impl<T>::
load (object_type& obj)
{
if (count_ > statement_->fetched ())
fetch ();
// This is a top-level call so the statements cannot be locked.
//
assert (!statements_.locked ());
typename object_statements<object_type>::auto_lock l (statements_);
typename object_traits::image_type& i (statements_.image ());
object_traits::init (obj, i, this->database ());
// Initialize the id image and binding and load the rest of the object
// (containers, etc).
//
typename object_traits::id_image_type& idi (statements_.id_image ());
object_traits::init (idi, object_traits::id (i));
binding& idb (statements_.id_image_binding ());
if (idi.version != statements_.id_image_version () || idb.version == 0)
{
object_traits::bind (idb.bind, idi);
statements_.id_image_version (idi.version);
idb.version++;
}
object_traits::load_ (statements_, obj);
statements_.load_delayed ();
l.unlock ();
}
template <typename T>
typename result_impl<T>::id_type result_impl<T>::
load_id ()
{
if (count_ > statement_->fetched ())
fetch ();
return object_traits::id (statements_.image ());
}
template <typename T>
void result_impl<T>::
next ()
{
this->current (pointer_type ());
// If we are cached, simply increment the position and
// postpone the actual row fetching until later. This way
// if the same object is loaded in between iteration, the
// image won't be messed up.
//
count_++;
if (statement_->cached ())
this->end_ = count_ > statement_->result_size ();
else
fetch ();
}
template <typename T>
void result_impl<T>::
fetch ()
{
// If the result is cached, the image can grow between calls
// to fetch() as a result of other statements execution.
//
if (statement_->cached ())
{
typename object_traits::image_type& im (statements_.image ());
if (im.version != statements_.out_image_version ())
{
binding& b (statements_.out_image_binding ());
object_traits::bind (b.bind, im, true);
statements_.out_image_version (im.version);
b.version++;
}
}
while (!this->end_ && count_ > statement_->fetched ())
{
select_statement::result r (statement_->fetch ());
switch (r)
{
case select_statement::truncated:
{
// Don't re-fetch data we are skipping.
//
if (count_ != statement_->fetched ())
continue;
typename object_traits::image_type& im (statements_.image ());
if (object_traits::grow (im, statements_.out_image_truncated ()))
im.version++;
if (im.version != statements_.out_image_version ())
{
binding& b (statements_.out_image_binding ());
object_traits::bind (b.bind, im, true);
statements_.out_image_version (im.version);
b.version++;
statement_->refetch ();
}
// Fall throught.
}
case select_statement::success:
{
break;
}
case select_statement::no_data:
{
this->end_ = true;
break;
}
}
}
}
template <typename T>
void result_impl<T>::
cache ()
{
if (!statement_->cached ())
{
statement_->cache ();
if (count_ >= statement_->result_size ())
this->end_ = true;
}
}
template <typename T>
std::size_t result_impl<T>::
size ()
{
if (!statement_->cached ())
throw result_not_cached ();
return statement_->result_size ();
}
}
}
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