"Relation does not exist" Postgresql - postgresql

Question

i have this error:
---------------------------
pgAdmin III
---------------------------
An error has occurred:
ERROR: relation "vettura_tariffa" does not exist
LINE 2: from vettura_tariffa
^
QUERY: SELECT ( select valore
from vettura_tariffa
where new.targa=vettura.targa)
CONTEXT: PL/pgSQL function "progettoBD".costout() line 14 at assignment
---------------------------
OK
---------------------------
the code is the following
create or replace function costout()
returns trigger AS
$$
DECLARE
giorno integer;
gg1 integer;
gg2 integer;
tariffa numeric(2,0) ;
costo integer;
BEGIN
gg1=extract (days from new.dataconsegna);
gg2=extract (days from new.dataritiro);
giorno=gg1-gg2;
tariffa=( select valore
from vettura join tariffa on vettura.tipotariffa=tariffa.tipo
where new.targa=vettura.targa);
costo=tariffa * giorni;
new.costoutilizzo=costo;
END;
$$ language plpgsql;
and this one is the trigger's code
create trigger costo_utilizzo
after insert on utilizzo
for each row
execute procedure costout();
It seems like it doesn't find the table vettura, it's the same with other tables, and if I try a simply "select * from vettura" it works fine.
I tried swapping the from with a view but the problem persists.
This error appears after the insert on "utilizzo".
Sorry for my bad english, thank you in advance.

Answer 1

Solution for JAVA problem.
We need to engage in double quotes and bars so that the command is accepted by postgresql.
sql = "INSERT INTO \"SCHEMA\".\"TABLE\"() values(?,?,?)

Answer 2

Ciao Atz34,
The error that is generated indicates that you are calling a function that makes a reference to vettura_tariffa while the code you post refers to vettura JOIN tariffa. Probably a simple mistake somewhere in your code. However, you have a few more issues with your trigger and trigger function.
First of all, you should call a BEFORE INSERT trigger when you modify any fields of NEW; on an AFTER INSERT trigger the changes will not be saved in the table (you can only do side effects like auditing or making changes to other tables).
Second, extract(date from ...) gives problems between months. Assuming your datacosegna and dataritiro are date columns, you can simply subtract them and add 1: NEW.dataritiro - NEW.dataconsegna + 1 (so same-day returns are not gratis).
Third, always RETURN NEW from an insert trigger.
You can then fold all statements into:
CREATE OR REPLACE FUNCTION costout() RETURNS trigger AS $$
BEGIN
SELECT valore * (NEW.dataritiro - NEW.dataconsegna + 1) INTO NEW.costoutilizzo
FROM vettura
JOIN tariffa ON vettura.tipotariffa = tariffa.tipo
WHERE NEW.targa = vettura.targa;
RETURN NEW;
END; $$ LANGUAGE plpgsql;