From 91830e3bd38a05c73d03a5dfb88997799d44274b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 6 May 2013 12:05:39 +0200
Subject: Add support for object sections

Sections are an optimization mechanism that allows the partitioning of
data members of a persistent class into groups that can be separately
loaded and/or updated.
---
 odb/database.txx | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

(limited to 'odb/database.txx')

diff --git a/odb/database.txx b/odb/database.txx
index 46ec752..5d4829a 100644
--- a/odb/database.txx
+++ b/odb/database.txx
@@ -2,6 +2,7 @@
 // copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
 // license   : GNU GPL v2; see accompanying LICENSE file
 
+#include <odb/section.hxx>
 #include <odb/exceptions.hxx>
 #include <odb/no-op-cache-traits.hxx>
 #include <odb/pointer-traits.hxx>
@@ -96,6 +97,20 @@ namespace odb
 
   template <typename T, database_id DB>
   void database::
+  load_ (T& obj, section& s)
+  {
+    connection_type& c (transaction::current ().connection ());
+
+    // T is always object_type.
+    //
+    if (object_traits_impl<T, DB>::load (c, obj, s))
+      s.reset (true, false); // Loaded, unchanged.
+    else
+      throw section_not_in_object ();
+  }
+
+  template <typename T, database_id DB>
+  void database::
   reload_ (T& obj)
   {
     // T should be object_type (cannot be const). We also don't need to
@@ -106,6 +121,26 @@ namespace odb
   }
 
   template <typename T, database_id DB>
+  void database::
+  update_ (const T& obj, const section& s)
+  {
+    if (!s.loaded ())
+      throw section_not_loaded ();
+
+    transaction& t (transaction::current ());
+
+    // T is always object_type.
+    //
+    if (object_traits_impl<T, DB>::update (t.connection (), obj, s))
+    {
+      if (s.changed ())
+        s.reset (true, false, &t); // Clear the change flag.
+    }
+    else
+      throw section_not_in_object ();
+  }
+
+  template <typename T, database_id DB>
   struct database::query_<T, DB, class_object>
   {
     template <typename Q>
-- 
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