Процедура с условием: если такая запись есть, то update, если нет, то insert

SET TERM!
CREATE PROCEDURE ins_tov AS DECLARE VARIABLE ID INTEGER
BEGIN
FOR SELECT id_knigi FROM postavka INTO :ID DO
IF (EXISTS(SELECT id_knigi FROM tovar WHERE id_knigi=:ID)) THEN
UPDATE tovar T SET kolichestvo=kolichestvo+1 WHERE id_knigi=:ID;
ELSE
INSERT INTO tovar(nazvanie_knigi,cena_knigi,kolichestvo) VALUES(:ID);
END!

CREATE PROCEDURE ins_tov 
AS 
DECLARE VARIABLE ID INT;
BEGIN
  FOR 
    SELECT id_knigi 
      FROM postavka 
      INTO :ID 
  DO BEGIN
    UPDATE tovar 
       SET kolichestvo=kolichestvo+1 
     WHERE id_knigi=:ID;
     
    IF (ROW_COUNT=0) THEN
      INSERT INTO tovar
        (id_knigi, nazvanie_knigi, cena_knigi, kolichestvo) 
      VALUES
        (:ID, '?', ?, 1);
  END
END

CREATE PROCEDURE ins_tov 
AS 
DECLARE VARIABLE ID INT;
BEGIN
  FOR 
    SELECT id_knigi 
      FROM postavka 
      INTO :ID 
  DO BEGIN
    IF (EXISTS(SELECT 1 FROM tovar WHERE id_knigi=:ID)) THEN
      UPDATE tovar 
         SET kolichestvo=kolichestvo+1 
       WHERE id_knigi=:ID;
    ELSE 
      INSERT INTO tovar
        (id_knigi, nazvanie_knigi, cena_knigi, kolichestvo) 
      VALUES
        (:ID, '?', ?, 1);
  END
END

SET TERM!
CREATE PROCEDURE proc1(pidknigi INT,pnazvanieknigi CHAR(100),pcenaknigi INT,pkolichestvo INT)
AS DECLARE VARIABLE ID INT;
BEGIN
SELECT COUNT(id_knigi) FROM tovar WHERE id_knigi=:pidknigi INTO :ID;
IF (ID>0) THEN BEGIN
UPDATE tovar SET kolichestvo=kolichestvo+1 WHERE id_knigi=:pidknigi;
END
ELSE
BEGIN
INSERT INTO tovar(id_knigi,nazvanie_knigi,cena_knigi,kolichestvo)
VALUES(:pidknigi,:pnazvanieknigi,:pcenaknigi,:pkolichestvo);
END
END!