Add support for data migration

1 files changed, 46 insertions, 0 deletions

diff --git a/evolution/data/model.hxx b/evolution/data/model.hxx
new file mode 100644
index 0000000..db49a44
--- /dev/null
+++ b/evolution/data/model.hxx
@@ -0,0 +1,46 @@
+// file      : evolution/data/model.hxx
+// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef MODEL_VERSION
+#  error model.hxx included directly
+#endif
+
+#include <odb/core.hxx>
+
+#pragma db model version(1, MODEL_VERSION)
+
+#define MODEL_NAMESPACE_IMPL(V) v##V
+#define MODEL_NAMESPACE(V) MODEL_NAMESPACE_IMPL(V)
+
+namespace MODEL_NAMESPACE(MODEL_VERSION)
+{
+#if MODEL_VERSION == 2
+  #pragma db object
+  struct object1
+  {
+    object1 (unsigned long id = 0): id_ (id) {}
+
+    #pragma db id
+    unsigned long id_;
+
+    int num;
+  };
+#endif
+
+#if MODEL_VERSION == 3
+  #pragma db object
+  struct object2
+  {
+    object2 (unsigned long id = 0): id_ (id) {}
+
+    #pragma db id
+    unsigned long id_;
+
+    int num;
+  };
+#endif
+}
+
+#undef MODEL_NAMESPACE
+#undef MODEL_NAMESPACE_IMPL