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.hxx | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'odb/database.hxx')

diff --git a/odb/database.hxx b/odb/database.hxx
index 79fa622..6c70da7 100644
--- a/odb/database.hxx
+++ b/odb/database.hxx
@@ -83,6 +83,12 @@ namespace odb
     void
     load (const typename object_traits<T>::id_type& id, T& object);
 
+    // Load (or reload, if it is already loaded) a section of an object.
+    //
+    template <typename T>
+    void
+    load (T& object, section&);
+
     // Reload an object.
     //
     template <typename T>
@@ -153,6 +159,14 @@ namespace odb
     void
     update (const typename object_traits<T>::pointer_type& obj_ptr);
 
+    // Update a section of an object. Throws section_not_loaded exception
+    // if section is not loaded. Note also that this function does not
+    // clear the changed flag if it is set.
+    //
+    template <typename T>
+    void
+    update (const T& object, const section&);
+
     // Make the object transient. Throw object_not_persistent if not
     // found.
     //
@@ -394,6 +408,10 @@ namespace odb
 
     template <typename T, database_id DB>
     void
+    load_ (T&, section&);
+
+    template <typename T, database_id DB>
+    void
     reload_ (T&);
 
     template <typename T, database_id DB>
@@ -414,6 +432,10 @@ namespace odb
 
     template <typename T, database_id DB>
     void
+    update_ (const T&, const section&);
+
+    template <typename T, database_id DB>
+    void
     erase_ (const typename object_traits<T>::id_type&);
 
     template <typename T, database_id DB>
-- 
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