some other question I dont like to make a new topic so I will add it
here.
I ve modified my function to
CREATE OR REPLACE FUNCTION bookid(_tabela varchar) RETURNS integer AS $
$
DECLARE
_id integer := 0;
BEGIN
--insert bez id wyzwala nextwal na tabela_columna_seq
EXECUTE 'insert into '|| quote_ident(_tabela) || '(idjm, waga,
stawka_vat) values(0, 0, '''')';
select into _id lastval();
RETURN _id;
END;
$$ LANGUAGE plpgsql;
and is that safe operation, can I rely on lastval() that it will
return value of id that was inserted before?
can it happened that other user will insert something between my
insert and select?