diff --git a/include/transport/mysqlbackend.h b/include/transport/mysqlbackend.h
index 04c00b7a6e0d4ef55bfb0129d32a10f7522a6856..b35a345d224f4dd53205e749eac20a968e299faa 100644
--- a/include/transport/mysqlbackend.h
+++ b/include/transport/mysqlbackend.h
@@ -48,6 +48,7 @@ class MySQLBackend : public StorageBackend
 		/// automatically.
 		/// \return true if database is opened successfully.
 		bool connect();
+		void disconnect();
 
 		/// Creates database structure.
 		/// \see connect()
@@ -100,7 +101,7 @@ class MySQLBackend : public StorageBackend
 				Statement(MYSQL *conn, const std::string &format, const std::string &statement);
 				~Statement();
 
-				bool execute();
+				int execute();
 
 				int fetch();