Why does the SYS_REFCURSOR results in a null value? - oracle

Question

Table CKSFLTHD
FILTERC
DESCR
ACTIVATE
ABC
Apple Bees Corner
1
EFG
Elephant Forest Grove
1
Table CKSFLTLN
FILTERC
SITE
LNUM
ABC
Apple Bees Corner
ABC123
EFG
Elephant Forest Grove
EFG456
This is what the output should look like, but a null table instead.
I'm going to use the DISPLAY to populate a dropdownlist.
DISPLAY
DATAVAL
Apple Bees Corner
ABC
OPEN cv_2 FOR
SELECT descr DispVal, filterc DataVal
FROM cksflthd
WHERE activate = 1
AND ( v_showAll = 1
OR filterc IN ( SELECT *
FROM ( SELECT DISTINCT filterc
FROM cksfltln
WHERE SITE IN ( SELECT SITE
FROM cksfltln
WHERE filterc = v_userfiltercode )
AND ( lnum <> ' '
OR filterc = v_userfiltercode ) ) useflt
WHERE filterc IN ( SELECT DISTINCT filterc
FROM cksfltln
WHERE SITE IN ( SELECT SITE
FROM cksfltln
WHERE filterc = v_filterCode )
AND ( lnum <> ' '
OR filterc = v_filterCode ) )
)
);

Answer 1

Check your code...
Here's what I did, trying to observe what you shared.
create table CKSFLTLN
(FILTERC varchar2(10),
SITE varchar2(25),
LNUM varchar2(10));
create table CKSFLTHD
(FILTERC varchar2(10),
DESCR varchar2(25),
ACTIVATE varchar2(25));
insert into cksflthd values ('ABC', 'Applebees Corner', 1);
insert into cksflthd values ('EFG', 'Elephant Forest Grove', 1);
insert into CKSFLTLN values ('ABC', 'Applebees Corner', 'ABC123');
insert into CKSFLTLN values ('EFG', 'Elephant Forest Grove', 'EFG456');
CREATE OR REPLACE FUNCTION refcursor_function
RETURN SYS_REFCURSOR
AS
c SYS_REFCURSOR;
v_userfiltercode varchar2(25) :='ABC';
v_filterCode varchar2(25) := 'ABC';
v_showall number(9,0) :=1 ;
BEGIN
OPEN c FOR
SELECT descr DispVal, filterc DataVal
FROM cksflthd
WHERE activate = 1
AND ( v_showAll = 1
OR filterc IN ( SELECT *
FROM ( SELECT DISTINCT filterc
FROM cksfltln
WHERE SITE IN ( SELECT SITE
FROM cksfltln
WHERE filterc = v_userfiltercode )
AND ( lnum <> ' '
OR filterc = v_userfiltercode ) ) useflt
WHERE filterc IN ( SELECT DISTINCT filterc
FROM cksfltln
WHERE SITE IN ( SELECT SITE
FROM cksfltln
WHERE filterc = v_filterCode )
AND ( lnum <> ' '
OR filterc = v_filterCode ) )
)
);
RETURN c;
END;
/
You only shared the cursor definition, not the PL/SQL program you are using, so I mocked one up, and hardcoded your user values...
Then I executed the function with an anonymous block, or really I asked SQL Developer to execute the function for me. And back came the refcursor...not null.