From 22cb56f4a1ad5d2c6d581bab5e528a0cf0d13b17 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 14 Aug 2013 15:16:09 +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.
---
 section/person.hxx | 105 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 section/person.hxx

(limited to 'section/person.hxx')

diff --git a/section/person.hxx b/section/person.hxx
new file mode 100644
index 0000000..996fc19
--- /dev/null
+++ b/section/person.hxx
@@ -0,0 +1,105 @@
+// file      : section/person.hxx
+// copyright : not copyrighted - public domain
+
+#ifndef PERSON_HXX
+#define PERSON_HXX
+
+#include <string>
+
+#include <odb/core.hxx>
+#include <odb/vector.hxx>
+#include <odb/section.hxx>
+
+#pragma db object
+class person
+{
+public:
+  person (const std::string& first, const std::string& last)
+      : first_ (first), last_ (last)
+  {
+  }
+
+  const std::string&
+  first () const
+  {
+    return first_;
+  }
+
+  const std::string&
+  last () const
+  {
+    return last_;
+  }
+
+  // Biography.
+  //
+  const std::string&
+  bio () const
+  {
+    return bio_;
+  }
+
+  void
+  bio (const std::string& bio)
+  {
+    bio_ = bio;
+    extras_.change (); // Mark the section as changed.
+  }
+
+  // Nicknames.
+  //
+  typedef odb::vector<std::string> names;
+
+  const names&
+  nicknames () const
+  {
+    return nicknames_;
+  }
+
+  names&
+  nicknames ()
+  {
+    // Because we are using a change-tracking container (odb::vector),
+    // ODB will automatically mark the section as changed if we update
+    // the nicknames.
+    //
+    return nicknames_;
+  }
+
+  // The extras section accessor and modifier. Notice that they are
+  // by-reference.
+  //
+  const odb::section&
+  extras_section () const
+  {
+    return extras_;
+  }
+
+  odb::section&
+  extras_section ()
+  {
+    return extras_;
+  }
+
+private:
+  friend class odb::access;
+
+  person () {}
+
+  #pragma db id auto
+  unsigned long id_;
+
+  std::string first_;
+  std::string last_;
+
+  #pragma db section(extras_)
+  std::string bio_;
+
+  #pragma db section(extras_)
+  names nicknames_;
+
+  #pragma db load(lazy) update(change)
+  odb::section extras_;
+};
+
+#endif // PERSON_HXX
-- 
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