ERROR:
ORA-02291: integrity constraint (ORA29.BSKTITEM_BSKTID_FK) violated - parent key not found 


DECLARE
  ex_id_fk EXCEPTION;
  PRAGMA EXCEPTION_INIT(ex_id_fk, -2291);
BEGIN
  UPDATE bb_basketitem
   SET idbasket = 99
   WHERE idbasketitem = 38;
EXCEPTION
  WHEN ex_id_fk THEN
   DBMS_OUTPUT.PUT_LINE('No basket with this id exists');
END;