diff --git a/database/db_types.anubis b/database/db_types.anubis
index dccf877..7af3b98 100644
--- a/database/db_types.anubis
+++ b/database/db_types.anubis
@@ -87,10 +87,21 @@ public define String
   )=
   if idx is
   {
-    none        then "none",
+    none        then "NULL",
     db_id(_idx) then abs_to_decimal(_idx)
   }.
 
+public define String
+  to_SQL
+  (
+    DB_id idx
+  )=
+  if idx is
+  {
+    none        then "NULL",
+    db_id(_idx) then abs_to_decimal(_idx)
+  }.
+  
 public define Maybe(Int)
   to_mb_Int
   (
--
libgit2 0.21.4