From: | Anton Andreev <fn30762(at)fmi(dot)uni-sofia(dot)bg> |
---|---|
To: | pgadmin-support(at)postgresql(dot)org |
Subject: | questions about cursors |
Date: | 2007-04-24 11:45:10 |
Message-ID: | 462DEDC6.2040506@fmi.uni-sofia.bg |
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Lists: | pgadmin-support pgsql-general |
Hi,
I am trying to use cursors and I am really frustrated already. Do I
need to install an extension?
1. Problem number one is that what ever I use in front of the fetch
command it is not being accepted, it gives a syntax error. If I use a
number ,"all" or "forward" it gives an error again?????????? I want to
do something like the code below:
CREATE OR REPLACE FUNCTION database_correction()
RETURNS double precision AS
$BODY$
DECLARE
mycursor CURSOR FOR select distinct(fund_id) from
"NAV_values_bfb_history";
iterator integer;
BEGIN
open mycursor;
FETCH mycursor INTO iterator;
--fetch next from mycursor --gives an error
WHILE (FETCH next from mycursor) LOOP
-- some computations here
END LOOP;
CLOSE mycursor;
END;
2. What is the right way to check that the cursor has ended. In
sqlserver there is a variable "@@fetch_status". I have to make here some
comparison in the while clause, but I am not sure what it should be. I
could not find a single example for cursor in a loop.
I will greatly appreciate any help, pgsql is my database of choice.
Cheers,
Anton
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