From: Maximilian Tyrtania <maximilian.tyrtania@inqua-institut.de>
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Subject: Problem with refcursor
Message-Id: <990A111A-190F-485A-9B96-665D6D3CABBD@inqua-institut.de>
Date: Tue, 9 Jan 2024 09:23:49 +0100
To: pgsql-sql@lists.postgresql.org
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 <https://www.postgresql.org/message-id/990A111A-190F-485A-9B96-665D6D3CABBD%40inqua-institut.de>
Precedence: bulk

Hi there,

I=E2=80=99m running into trouble with ref cursors.

I=E2=80=99ve got these 2 functions, this inner one:

CREATE or replace FUNCTION f_client_getCoachingsuccessrate(p_clients =
refcursor,out successrate numeric, out unclearrate numeric, out failrate =
numeric) AS $$
DECLARE
curClient record;
vNumberOfClients bigint;
vSuccessCounter BIGINT=3D0;
vUnclearCounter BIGINT=3D0;
vFailureCounter BIGINT=3D0;
vCurSuccessState boolean;
BEGIN
    FOR curClient IN FETCH ALL FROM p_clients LOOP
=E2=80=94some processing
    END LOOP;
	=
successrate=3Df_bigint_getpercentage(vSuccessCounter,vNumberOfClients);
	=
unclearrate=3Df_bigint_getpercentage(vUnclearCounter,vNumberOfClients);
	=
failrate=3Df_bigint_getpercentage(vFailureCounter,vNumberOfClients);
*/	END;
$$ LANGUAGE plpgsql;


=E2=80=A6and this outer one:

create or replace function f_client_get3rdFeedbacksuccessrate(out =
successrate numeric, out unclearrate numeric, out failrate numeric) as=20=

$$
DECLARE
invitedClients refcursor;
BEGIN
open invitedClients FOR SELECT c.* FROM client c join email e on =
e.client_id=3Dc.id where e.textblock_id=3D340;
--raise notice 'all is fine so far';
Select rates.successrate,rates.unclearrate,rates.failrate from =
f_client_getCoachingsuccessrate(invitedClients) rates into =
successrate,unclearrate ,failrate;
end;
$$
 LANGUAGE plpgsql;

Now, calling the outer one like this:

select * from f_client_get3rdFeedbacksuccessrate();

results in:

Query 1 ERROR at Line 1: : ERROR:  cannot open FETCH query as cursor
CONTEXT:  PL/pgSQL function f_client_getcoachingsuccessrate(refcursor) =
line 10 at FOR over SELECT rows
SQL statement "SELECT f_client_getCoachingsuccessrate(invitedClients)"
PL/pgSQL function f_client_get3rdfeedbacksuccessrate() line 8 at PERFORM

Any pointers?

Thanks, Max=