Revisited the persistence layer.

Simplified schema to focus on user and node.
Now possible to have sqlite via ODBC and/or mysql support, and select using configuration file.
Updated demo example.

library/persistence/implementation/mysql/tests/transactions/transaction_test_set.e

@@ -3,8 +3,8 @@ note
 		Eiffel tests that can be executed by testing tool.
 	]"
 	author: "EiffelStudio test wizard"
-	date: "$Date$"
-	revision: "$Revision$"
+	date: "$Date: 2015-01-27 19:15:02 +0100 (mar., 27 janv. 2015) $"
+	revision: "$Revision: 96542 $"
 	testing: "type/manual"
 
 class
@@ -30,7 +30,7 @@ feature {NONE} -- Events
 	on_prepare
 			-- <Precursor>
 		do
-			(create {CLEAN_DB}).clean_db(connection)
+			(create {CLEAN_DB}).clean_db (connection)
 		end
 
 	on_clean
@@ -43,55 +43,45 @@ feature -- Test routines
 	test_user_rollback
 		note
 			testing:  "execution/isolated"
+		local
+			u: detachable CMS_USER
 		do
-			connection.begin_transaction
-			user_provider.new_user ("test", "test","test@admin.com")
-			assert ("Has user:", user_provider.has_user)
-			connection.rollback
-			assert ("Not has user:", not user_provider.has_user)
+			u := storage.user_by_name ("test")
+			if u = Void then
+				u := custom_user ("test", "test","test@admin.com")
+				storage.new_user (u)
+			end
+			assert ("Has user:", storage.has_user)
+			u.set_email ("test@example.com")
+			storage.sql_begin_transaction
+			storage.update_user (u)
+			assert ("Has user:", storage.user_by_email ("test@example.com") /= Void)
+			storage.sql_rollback_transaction
+			assert ("Not has user:", storage.user_by_email ("test@example.com") = Void)
 		end
 
 	test_user_node_rollback
 		note
 			testing:  "execution/isolated"
+		local
+			u: detachable CMS_USER
 		do
+			u := storage.user_by_name ("test")
+			if u = Void then
+				u := custom_user ("test", "test","test@admin.com")
+				storage.new_user (u)
+			end
+
 			connection.begin_transaction
-			user_provider.new_user ("test", "test","test@admin.com")
-			assert ("Has user:", user_provider.has_user)
-			node_provider.new_node (default_node)
-			node_provider.add_author (1, 1)
-			assert ("Has one node:", node_provider.count = 1)
+			u.set_email ("test@example.com")
+			assert ("Has user:", storage.user_by_email ("test@example.com") /= Void)
+			storage.new_node (default_node)
+			assert ("Has one node:", storage.nodes_count = 1)
 			connection.rollback
-			assert ("Not has user:", not user_provider.has_user)
-			assert ("Not has nodes:", node_provider.count = 0)
+			assert ("Not has user:", storage.user_by_email ("test@example.com") = Void)
+			assert ("Has no node:", storage.nodes_count = 0)
 		end
 
-feature {NONE} -- Implementation
-
-	node_provider: NODE_DATA_PROVIDER
-			-- node provider.
-		once
-			create Result.make (connection)
-		end
-
-	user_provider: USER_DATA_PROVIDER
-			-- user provider.
-		once
-			create Result.make (connection)
-		end
-
-
-feature {NONE} -- Implementation Fixture Factories
-
-	default_node: CMS_NODE
-		do
-			Result := custom_node ("Default content", "default summary", "Default")
-		end
-
-	custom_node (a_content, a_summary, a_title: READABLE_STRING_32): CMS_NODE
-		do
-			create Result.make (a_content, a_summary, a_title)
-		end
 end