how referencing %rowtype variables without column names - Mailing list pgsql-sql

I wrote a trigger and use %rowtype , the problue is I need to put the
column name in a variable

like
Declare
columnname  VARCHAR(20);
NOTIFYRULE NOTIFY_RULE%ROWTYPE
begin
columnname='TYPE' /* ONE OF NOTIFY_RULE column*/

SELECT * INTO NOTIFYRULE FROM NOTIFY_RULE WHERE STATUS=:OLD.STATUS;

end;

how can i use this columnname to get the column value form NOTIFYRULE
without use "NOTIFYRULE.TYPE"