2009/12/19 Postgres User <postgres.developer@gmail.com>:
> Hi,
>
> I have a function that returns a refcursor that I need to call from a
> second function. In the second function, I'd like to read a column
> value from each row. However, I'm having a problem accessing the rows
> of the refcursor.
> Can anyone point me to a working example of how to pull this off?
>
> This is the latest iteration of the function code that I've t
You cannot use SELECT FROM cursor. Look on FETCH statement. If you
need iterate over cursor in other function, then you have to use cycle
over cursor - some like
FETCH FROM refcursor_variable INTO recvariable;
LOOP
EXIT WHEN NOT FOUND;
do some with values
FETCH FROM refcursor_variable INTO recvariable;
END LOOP;
see
http://www.postgresql.org/docs/8.3/static/plpgsql-cursors.html
Regards
Pavel Stehule
>
> CREATE OR REPLACE FUNCTION "return_cursor" (
> )
> RETURNS SETOF "pg_catalog"."refcursor" AS
> $body$
> DECLARE
> rf refcursor;
> BEGIN
> OPEN rf FOR
> SELECT * FROM category;
> RETURN Next rf;
> END;
> $body$
> LANGUAGE 'plpgsql' VOLATILE;
>
> CREATE OR REPLACE FUNCTION "test"."read_cursor" (
> )
> RETURNS integer [] AS
> $body$
> DECLARE
> r record;
> cat_list integer[];
> BEGIN
> FOR r IN SELECT * FROM test.return_cursor() LOOP
> cat_list = cat_list || r.category_id;
> END LOOP;
> Return cat_list;
> END;
> $body$
> LANGUAGE 'plpgsql';
>
> with this table struct:
>
> CREATE TABLE "category" (
> "category_id" SERIAL,
> "parent_id" INTEGER,
> "category_name" VARCHAR(50)
> ) WITHOUT OIDS;
>
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