Generate add/drop table migration statements

1 files changed, 41 insertions, 0 deletions

diff --git a/evolution/template/model.hxx b/evolution/template/model.hxx
new file mode 100644
index 0000000..ef6c9d0
--- /dev/null
+++ b/evolution/template/model.hxx
@@ -0,0 +1,41 @@
+// file      : evolution/template/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 == 3
+  #pragma db object
+  struct object
+  {
+    #pragma db id auto
+    unsigned long id_;
+  };
+#endif
+
+  // The presence of this object makes sure that there are no empty
+  // changesets and we get the complete set of migration files.
+  //
+  #pragma db object
+  struct dummy
+  {
+    dummy (unsigned long id = 0): id_ (id) {}
+
+    #pragma db id
+    unsigned long id_;
+  };
+}
+
+#undef MODEL_NAMESPACE
+#undef MODEL_NAMESPACE_IMPL