From 287a41287ed26bcf481f087680cad56ed5ef9865 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 9 Apr 2013 16:17:26 +0200
Subject: Add support for embedded schema migration

---
 odb/schema-catalog.hxx | 74 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 71 insertions(+), 3 deletions(-)

(limited to 'odb/schema-catalog.hxx')

diff --git a/odb/schema-catalog.hxx b/odb/schema-catalog.hxx
index b9252d3..da6b767 100644
--- a/odb/schema-catalog.hxx
+++ b/odb/schema-catalog.hxx
@@ -9,7 +9,7 @@
 
 #include <string>
 
-#include <odb/forward.hxx> // odb::core
+#include <odb/forward.hxx> // schema_version, odb::core
 
 #include <odb/details/export.hxx>
 
@@ -18,17 +18,85 @@ namespace odb
   class LIBODB_EXPORT schema_catalog
   {
   public:
+    // Schema creation.
+    //
     static void
     create_schema (database&, const std::string& name = "");
 
-    static bool
-    exists (database_id, const std::string& name);
+    // Schema migration.
+    //
+    static void
+    migrate_schema_pre (database& db,
+                        schema_version v,
+                        const std::string& name = "")
+    {
+      migrate_schema_impl (db, v, name, migrate_pre);
+    }
+
+    static void
+    migrate_schema_post (database& db,
+                         schema_version v,
+                         const std::string& name = "")
+    {
+      migrate_schema_impl (db, v, name, migrate_post);
+    }
+
+    static void
+    migrate_schema (database& db,
+                    schema_version v,
+                    const std::string& name = "")
+    {
+      migrate_schema_impl (db, v, name, migrate_both);
+    }
+
+    // Return 0 if current is greater or equal to the latest version.
+    //
+    schema_version
+    next_version (const database& db,
+                  schema_version current /*= 0*/,
+                  const std::string& name = "")
+    {
+      return next_version (db.id (), current, name);
+    }
+
+    schema_version
+    next_version (database_id,
+                  schema_version current /*= 0*/,
+                  const std::string& name = "");
+
+    schema_version
+    latest_version (const database& db, const std::string& name = "")
+    {
+      return latest_version (db.id (), name);
+    }
+
+    schema_version
+    latest_version (database_id, const std::string& name = "");
 
+    // Test for presence of a schema with a specific name.
+    //
     static bool
     exists (const database& db, const std::string& name)
     {
       return exists (db.id (), name);
     }
+
+    static bool
+    exists (database_id, const std::string& name);
+
+  private:
+    enum migrate_mode
+    {
+      migrate_pre,
+      migrate_post,
+      migrate_both
+    };
+
+    static void
+    migrate_schema_impl (database&,
+                         schema_version,
+                         const std::string& name,
+                         migrate_mode);
   };
 
   namespace common
-- 
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