WIP: OrderBy implementation

exec/select.go

@@ -98,10 +98,11 @@ func (s *Select[T]) execute(conn *simpleorm.DBConnection, tx *sql.Tx) error {
 	}
 
 	if len(s.ordering) > 0 {
-		dml += " ORDER BY"
-		for _, orderBy := range s.ordering {
-
-			dml += " " + orderBy.Field + " " + orderBy.Direction
+		orderBy, err := s.target.GetOrderByDML(s.ordering...)
+		if err != nil {
+			log.LogError("Failed to create ORDER BY part: %s", err)
+		} else {
+			dml += orderBy
 		}
 	}