BEGIN
  DECLARE Zapper SENSITIVE CURSOR FOR ZapperSQL;
  DECLARE txt VARCHAR;

  SET txt = 'SELECT * FROM emReadStatus WHERE emReadStatus._fkEMails = '+CAST(OLDROW._MsgNo AS VARCHAR);

  PREPARE ZapperSQL FROM txt;
  OPEN Zapper;
  START TRANSACTION ON TABLES Zapper;
  BEGIN
    WHILE NOT EOF(Zapper) DO DELETE FROM Zapper;
    END WHILE;
  COMMIT;
  EXCEPTION
    ROLLBACK;
  END;
END