plpgsql - Commit, savepoint, rollback to in PostgreSQL?

Question

Can someone please explain to me why does COMMIT in this function returns EXCEPTION ?

DECLARE
  XNar CURSOR (forDATE Varchar) IS 
   SELECT NARUCENO, ISPORUKA_ID FROM XDATA_NARUDZBE 
   WHERE TO_CHAR(XDATA_NARUDZBE.DATUM, 'DD.MM.YYYY') = forDATE;
 LastDate  DATE;
 OutResult INTEGER;
 curNAR    NUMERIC;
 curISP    VARCHAR;
 RXNar     RECORD; 
BEGIN

 OutResult := 1;

 SELECT MAX(DATUM) INTO LastDate FROM XDATA_NARUDZBE;  

 FOR RXNar IN XNar(TO_CHAR(LastDate, 'DD.MM.YYYY')) LOOP

   IF (RXNar.NARUCENO <> 0) AND (RXNar.ISPORUKA_ID = 'R01') THEN
     UPDATE NARUDZBE SET ISPORUCENO = RXNar.NARUCENO 
      WHERE NARUDZBE.PP_ID  = RXNar.PP_ID
        AND NARUDZBE.ART_ID = RXNar.ART_ID
        AND NARUDZBE.ISPORUKA_ID = 'R01';
   END IF;

  END LOOP;

 COMMIT; <--- ????

 RETURN OutResult;

 EXCEPTION
  WHEN OTHERS THEN
   OUTRESULT := 0;
   RAISE;    
   RETURN OutResult;

END;    

and why I can not use ROLLBACK TO SavePoint when EXCEPTION block exists in function?

Answer 1

You can't use COMMIT in a stored procedure, the entire procedure is a transaction of it's own.