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/polymorphic-map.hxx | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

(limited to 'odb/polymorphic-map.hxx')

diff --git a/odb/polymorphic-map.hxx b/odb/polymorphic-map.hxx
index 5c3e434..3c0883f 100644
--- a/odb/polymorphic-map.hxx
+++ b/odb/polymorphic-map.hxx
@@ -149,7 +149,8 @@ namespace odb
   };
 
   template <typename T, database_id DB>
-  bool dispatch_impl (
+  bool
+  dispatch_impl (
     typename polymorphic_concrete_info<
       typename object_traits<T>::root_type>::call_type c,
     database& db,
@@ -235,6 +236,37 @@ namespace odb
 
     return r;
   }
+
+  template <typename T, database_id DB, typename ST>
+  void
+  section_load_impl (odb::connection& conn,
+                     typename object_traits<T>::root_type& obj,
+                     bool top)
+  {
+    typedef object_traits_impl<T, DB> derived_traits;
+    typedef typename derived_traits::statements_type statements_type;
+    typedef typename statements_type::connection_type connection_type;
+
+    connection_type& c (static_cast<connection_type&> (conn));
+    statements_type& sts (c.statement_cache ().template find_object<T> ());
+
+    ST::load (sts.extra_statement_cache (), static_cast<T&> (obj), top);
+  }
+
+  template <typename T, database_id DB, typename ST>
+  void
+  section_update_impl (odb::connection& conn,
+                       const typename object_traits<T>::root_type& obj)
+  {
+    typedef object_traits_impl<T, DB> derived_traits;
+    typedef typename derived_traits::statements_type statements_type;
+    typedef typename statements_type::connection_type connection_type;
+
+    connection_type& c (static_cast<connection_type&> (conn));
+    statements_type& sts (c.statement_cache ().template find_object<T> ());
+
+    ST::update (sts.extra_statement_cache (), static_cast<const T&> (obj));
+  }
 }
 
 #include <odb/polymorphic-map.ixx>
-- 
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