Polymorphic inheritance support

1 files changed, 142 insertions, 0 deletions

diff --git a/odb/mssql/no-id-object-result.txx b/odb/mssql/no-id-object-result.txx
new file mode 100644
index 0000000..f3674fb
--- /dev/null
+++ b/odb/mssql/no-id-object-result.txx
@@ -0,0 +1,142 @@
+// file      : odb/mssql/no-id-object-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/no-id-object-statements.hxx>
+
+namespace odb
+{
+  namespace mssql
+  {
+    template <typename T>
+    no_id_object_result_impl<T>::
+    ~no_id_object_result_impl ()
+    {
+      change_callback_type& cc (statements_.image ().change_callback_);
+
+      if (cc.context == this)
+      {
+        cc.context = 0;
+        cc.callback = 0;
+      }
+
+      if (!this->end_)
+        statement_->free_result ();
+
+      delete image_copy_;
+    }
+
+    template <typename T>
+    no_id_object_result_impl<T>::
+    no_id_object_result_impl (const query&,
+                              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 no_id_object_result_impl<T>::
+    load (object_type& obj)
+    {
+      if (!can_load_)
+        throw long_data_reload ();
+
+      odb::database& db (this->database ());
+
+      object_traits::callback (db, obj, callback_event::pre_load);
+
+      object_traits::init (obj,
+                           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);
+
+      object_traits::callback (db, obj, callback_event::post_load);
+    }
+
+    template <typename T>
+    void no_id_object_result_impl<T>::
+    next ()
+    {
+      can_load_ = true;
+      this->current (pointer_type ());
+
+      typename object_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_.select_image_version ())
+      {
+        binding& b (statements_.select_image_binding ());
+        object_traits::bind (b.bind, im, statement_select);
+        statements_.select_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 no_id_object_result_impl<T>::
+    cache ()
+    {
+    }
+
+    template <typename T>
+    std::size_t no_id_object_result_impl<T>::
+    size ()
+    {
+      throw result_not_cached ();
+    }
+
+    template <typename T>
+    void no_id_object_result_impl<T>::
+    change_callback (void* c)
+    {
+      no_id_object_result_impl<T>* r (
+        static_cast<no_id_object_result_impl<T>*> (c));
+
+      typename object_traits::image_type im (r->statements_.image ());
+
+      if (r->image_copy_ == 0)
+        r->image_copy_ = new typename object_traits::image_type (im);
+      else
+        *r->image_copy_ = im;
+
+      im.change_callback_.callback = 0;
+      im.change_callback_.context = 0;
+
+      r->use_copy_ = true;
+    }
+  }
+}