From 290d22210040a7b373e2dc9084240cdeffa1fa3a Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 21 Mar 2012 08:37:25 +0200
Subject: Polymorphic inheritance support

---
 odb/mssql/polymorphic-object-statements.txx | 136 ++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 odb/mssql/polymorphic-object-statements.txx

(limited to 'odb/mssql/polymorphic-object-statements.txx')

diff --git a/odb/mssql/polymorphic-object-statements.txx b/odb/mssql/polymorphic-object-statements.txx
new file mode 100644
index 0000000..87ed696
--- /dev/null
+++ b/odb/mssql/polymorphic-object-statements.txx
@@ -0,0 +1,136 @@
+// file      : odb/mssql/polymorphic-object-statements.txx
+// copyright : Copyright (c) 2005-2012 Code Synthesis Tools CC
+// 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>
+
+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> ()),
+          container_statement_cache_ (conn),
+          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)
+    {
+      connection_type& conn (transaction::current ().connection ());
+      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_().
+      //
+      if (!object_traits::find_ (sts, &id))
+        throw object_not_persistent ();
+
+      auto_result ar (*sts.find_[0]);
+
+      object_traits::callback (db, obj, callback_event::pre_load);
+      object_traits::init (obj, sts.image (), &db);
+      sts.find_[0]->stream_result ();
+      ar.free ();
+      object_traits::load_ (sts, obj); // Load containers, etc.
+
+      rsts.load_delayed ();
+
+      {
+        typename root_statements_type::auto_unlock u (rsts);
+        object_traits::callback (db, obj, callback_event::post_load);
+      }
+    }
+  }
+}
-- 
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