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From: Maximilian Tyrtania <[email protected]>
To: [email protected]
Subject: Problem with refcursor
Date: Tue, 9 Jan 2024 09:23:49 +0100
Message-ID: <[email protected]> (raw)

Hi there,

I’m running into trouble with ref cursors.

I’ve 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 $$
DECLARE
curClient record;
vNumberOfClients bigint;
vSuccessCounter BIGINT=0;
vUnclearCounter BIGINT=0;
vFailureCounter BIGINT=0;
vCurSuccessState boolean;
BEGIN
    FOR curClient IN FETCH ALL FROM p_clients LOOP
—some processing
    END LOOP;
	successrate=f_bigint_getpercentage(vSuccessCounter,vNumberOfClients);
	unclearrate=f_bigint_getpercentage(vUnclearCounter,vNumberOfClients);
	failrate=f_bigint_getpercentage(vFailureCounter,vNumberOfClients);
*/	END;
$$ LANGUAGE plpgsql;


…and this outer one:

create or replace function f_client_get3rdFeedbacksuccessrate(out successrate numeric, out unclearrate numeric, out failrate numeric) as 
$$
DECLARE
invitedClients refcursor;
BEGIN
open invitedClients FOR SELECT c.* FROM client c join email e on e.client_id=c.id where e.textblock_id=340;
--raise notice 'all is fine so far';
Select rates.successrate,rates.unclearrate,rates.failrate from f_client_getCoachingsuccessrate(invitedClients) rates into successrate,unclearrate ,failrate;
end;
$$
 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

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