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// file : odb/mssql/polymorphic-object-statements.txx
// license : ODB NCUEL; see accompanying LICENSE file
#include <cstring> // std::memset
#include <odb/callback.hxx>
#include <odb/exceptions.hxx>
#include <odb/mssql/connection.hxx>
#include <odb/mssql/transaction.hxx>
#include <odb/mssql/statement-cache.hxx>
#include <odb/mssql/traits-calls.hxx>
namespace odb
{
namespace mssql
{
//
// polymorphic_root_object_statements
//
template <typename T>
polymorphic_root_object_statements<T>::
~polymorphic_root_object_statements ()
{
}
template <typename T>
polymorphic_root_object_statements<T>::
polymorphic_root_object_statements (connection_type& conn)
: object_statements<T> (conn),
discriminator_image_binding_ (discriminator_image_bind_,
discriminator_column_count +
managed_optimistic_column_count),
discriminator_id_image_binding_ (discriminator_id_image_bind_,
id_column_count)
{
discriminator_image_.version = 0;
discriminator_id_image_.version = 0;
discriminator_image_version_ = 0;
discriminator_id_image_version_ = 0;
std::memset (
discriminator_image_bind_, 0, sizeof (discriminator_image_bind_));
std::memset (
discriminator_id_image_bind_, 0, sizeof (discriminator_id_image_bind_));
}
//
// polymorphic_derived_object_statements
//
template <typename T>
polymorphic_derived_object_statements<T>::
~polymorphic_derived_object_statements ()
{
}
template <typename T>
polymorphic_derived_object_statements<T>::
polymorphic_derived_object_statements (connection_type& conn)
: statements_base (conn),
root_statements_ (conn.statement_cache ().find_object<root_type> ()),
base_statements_ (conn.statement_cache ().find_object<base_type> ()),
insert_image_binding_ (insert_image_bind_, insert_column_count),
update_image_binding_ (update_image_bind_,
update_column_count + id_column_count)
{
image_.base = &base_statements_.image ();
image_.version = 0;
for (std::size_t i (0); i < object_traits::depth; ++i)
select_image_versions_[i] = 0;
for (std::size_t i (0);
i < (object_traits::abstract ? 1 : object_traits::depth);
++i)
{
select_image_bindings_[i].bind = select_image_bind_;
select_image_bindings_[i].count = object_traits::find_column_counts[i];
select_image_bindings_[i].change_callback = 0;
}
// Statements other than the first one (which goes all the way to
// the root) can never override the image because they are used to
// load up the dynamic part of the object only after the static
// part has been loaded (and triggered the callback if necessary).
//
select_image_bindings_[0].change_callback =
root_statements_.image ().change_callback ();
insert_image_version_ = 0;
insert_id_binding_version_ = 0;
update_image_version_ = 0;
update_id_binding_version_ = 0;
std::memset (insert_image_bind_, 0, sizeof (insert_image_bind_));
std::memset (update_image_bind_, 0, sizeof (update_image_bind_));
std::memset (select_image_bind_, 0, sizeof (select_image_bind_));
}
template <typename T>
void polymorphic_derived_object_statements<T>::
delayed_loader (odb::database& db,
const id_type& id,
root_type& robj,
const schema_version_migration* svm)
{
connection_type& conn (transaction::current ().connection (db));
polymorphic_derived_object_statements& sts (
conn.statement_cache ().find_object<object_type> ());
root_statements_type& rsts (sts.root_statements ());
object_type& obj (static_cast<object_type&> (robj));
// The same code as in object_statements::load_delayed_().
//
object_traits_calls<T> tc (svm);
if (!tc.find_ (sts, &id))
throw object_not_persistent ();
auto_result ar (*sts.find_[0]);
object_traits::callback (db, obj, callback_event::pre_load);
tc.init (obj, sts.image (), &db);
sts.find_[0]->stream_result ();
ar.free ();
tc.load_ (sts, obj, false); // Load containers, etc.
rsts.load_delayed (svm);
{
typename root_statements_type::auto_unlock u (rsts);
object_traits::callback (db, obj, callback_event::post_load);
}
}
}
}
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