Pass Query in Clob to Cursor (PL/SQL) - oracle

Question

I have a function that returns A clob which is actually a query. I want to call that function in another function where I want to create a cursor that will have the results of that query as it's data.
So I have this function
performance_9chartsDay(p_display_resolution,p_technology_group)
And If I call it
SELECT performance_9chartsDay(1,'OTHER') FROM DUAL;
I get the following query (clob)
'Select "Category" as "Category", less_than_5m as "<5 min", less_than_15m as "<15 min", less_than_60m as "<60 min", more_than_60m as ">60 min" ,95 as KPI from ( Select "Category",ROUND((less_than_5m / (less_than_5m+less_than_15m+less_than_60m+more_than_60m))*100,2) AS less_than_5m,
ROUND((less_than_15m / (less_than_5m+less_than_15m+less_than_60m+more_than_60m))*100,2) AS less_than_15m,
ROUND((less_than_60m / (less_than_5m+less_than_15m+less_than_60m+more_than_60m))*100,2) AS less_than_60m,
ROUND((more_than_60m / (less_than_5m+less_than_15m+less_than_60m+more_than_60m))*100,2) AS more_than_60m from (WITH statistics AS
(SELECT /*+ materialize */
*
FROM
(SELECT trim(TO_CHAR(TRUNC(last_upd), 'Month')) || ' ' || trim(TO_CHAR(TRUNC(last_upd), 'YYYY')) AS month ,
'Week ' || TO_CHAR(TRUNC(last_upd), 'WW') || ' (' || trim(TO_CHAR(TRUNC(last_upd), 'YYYY')) || ')' AS week ,
TRUNC(last_upd) AS datum,
CASE
WHEN (completed_sec/60) <= 5
THEN '<5M'
WHEN (completed_sec/60) > 5
AND (completed_sec /60) <= 15
THEN '<15M'
WHEN (completed_sec/60) > 15
AND (completed_sec /60) <= 60
THEN '<60M'
WHEN (completed_sec/60) > 60
THEN '>60M'
END AS completed_in_less_than
FROM ORD_LOAD
WHERE 1=1 AND trunc(last_upd) >= to_date('29.01.2023', 'dd.mm.yyyy') and technology in ('Mobile', 'Homebox') ) pivot (COUNT(completed_in_less_than) FOR completed_in_less_than
IN ('<5M' less_than_5m,'<15M' less_than_15m ,'<60M' less_than_60m,'>60M' more_than_60m)))
SELECT to_char(date,'dd.mm.yyyy') as "Category",SUM (less_than_5m) AS less_than_5m,
SUM (less_than_15m) AS less_than_15m,
SUM (less_than_60m) AS less_than_60m,
SUM (more_than_60m) AS more_than_60m
from statistics
group by to_char(date,'dd.mm.yyyy'))) order by to_date("Category",'dd.mm.yyyy')'
Now I have this function
FUNCTION fixMobOtherDayWeekMonth_pipe(
p_display_resolution VARCHAR2,
p_technology_group VARCHAR2
)return fixMobOtherDayWeekMonth_table PIPELINED
AS
output fixMobOtherDayWeekMonth;
v1 VARCHAR2 (200);
v2 NUMBER;
v3 NUMBER;
v4 NUMBER;
v5 NUMBER;
v6 NUMBER;
CURSOR cursor_k IS --SELECT THAT QUERY FROM THAT FUNCTION
....
```
How do I get the data from the query from that function into this cursor?

Answer 1

Look into REF CURSORs, that's what they are for. Modify performance_9chartsDay so that instead of returning a string, it opens a ref cursor with that string and returns the ref cursor.
CREATE OR REPLACE FUNCTION performance_9chartsDay (...)
RETURN sys_refcursor
AS
cur sys_refcursor;
BEGIN
OPEN cur for 'SQL string here';
RETURN cur;
END;
Then pass the result of that function into fixMobOtherDayWeekMonth_pipe through an IN variable of type sys_refcursor, and fetch from it.
CREATE OR REPLACE FUNCTION fixMobOtherDayWeekMonth_pipe(in_cursor IN sys_refcursor,....)
RETURN fixMobOtherDayWeekMonth_table
AS
output fixMobOtherDayWeekMonth;
BEGIN
FETCH in_cursor INTO output;
WHILE in_cursor%FOUND
LOOP
FETCH in_cursor INTO output;
PIPE ROW....
END LOOP;
END;