sys_refcursor result not visible - plsql

Question

I created a procedure which will give the resultset in a SYS_REFCURSOR.
But I don't see the result set in the output, not even the count of records.
CREATE OR REPLACE PROCEDURE p_get_job_run_details_test (p_details OUT sys_refcursor) AS
l_start_date TIMESTAMP;
date1 TIMESTAMP;
l_end_date TIMESTAMP;
l_count INTEGER;
p_start_date date;
p_end_date date;
BEGIN
p_start_date := '11-JUN-2019';
p_end_date := '11-JUN-2019';
select to_timestamp_tz(p_start_date || ' 00:00:00 EUROPE/PARIS', 'DD-MON-YYYY HH24:MI:SS TZR')
into l_start_date
from dual;
select to_timestamp_tz(p_end_date || ' 23:59:59 EUROPE/PARIS', 'DD-MON-YYYY HH24:MI:SS TZR')
into l_end_date
from dual;
select count(*)
into l_count
FROM all_scheduler_job_run_details
WHERE job_name = 'RANDOM_JOB'
and log_date >= l_start_date
and log_date <= l_end_date
;
dbms_output.put_line(l_count);
OPEN p_details FOR
SELECT owner, log_date, job_subname,
status, error# as error, req_start_date, actual_start_date,
run_duration, additional_info
FROM all_scheduler_job_run_details
WHERE log_date >= l_start_date
AND log_date <= l_end_date
AND job_name = 'RANDOM_JOB'
ORDER BY log_date DESC;
END p_get_job_run_details_test;
I am expecting one row as an output.
If I do this separately
SELECT *--count(*) into l_count
FROM all_scheduler_job_run_details
WHERE log_date >= to_timestamp_tz('11-JUN-19' || ' 00:00:00 EUROPE/PARIS', 'DD-MON-YY HH24:MI:SS TZR')
AND log_date <= to_timestamp_tz('11-JUN-19' || ' 23:59:59 EUROPE/PARIS', 'DD-MON-YY HH24:MI:SS TZR')
AND job_name = 'RANDOM_JOB';
I can see the result : 1 row.

Answer 1

Your p_start_date and p_end_date variables are of the wrong datatype.
I ran your code, with the following line added after the to_timestamp_tz calls:
dbms_output.put_line(to_char(l_start_date, 'YYYY-MM-DD HH24:MI:SS') || '|' || to_char(l_end_date, 'YYYY-MM-DD HH24:MI:SS'));
The result was these nonsense dates with incorrect century:
0019-06-11 00:00:00|0019-06-11 23:59:59
The problem is these lines:
p_start_date date;
p_end_date date;
BEGIN
p_start_date := '11-JUN-2019';
p_end_date := '11-JUN-2019';
The variables are defined as DATE, so when a text literal is assigned to them, Oracle implicitly converts the literals to dates by applying your NLS_DATE_FORMAT. This is most likely not doing what you expect.
A simple fix would be to use proper DATE literals or TO_DATE conversions here:
p_start_date := DATE'2019-06-11';
p_end_date := DATE'2019-06-11';
-- or
p_start_date := TO_DATE('11-JUN-2019', 'DD-MON-YYYY');
p_end_date := TO_DATE('11-JUN-2019', 'DD-MON-YYYY');
Note that you also will have a problem in the to_timestamp_tz calls because Oracle will now implicitly convert your date variables to varchar2 in order to concatenate with ' 00:00:00 EUROPE/PARIS'.
Again, this will be done using your NLS_DATE_FORMAT setting, which is likely not what you expect.
Either use an explicit TO_CHAR conversion with date mask or make p_start_date and p_end_date proper varchar2 variables from the start.
Here's a version that works:
CREATE OR REPLACE PROCEDURE p_get_job_run_details_test (p_details OUT sys_refcursor) AS
l_start_date TIMESTAMP;
date1 TIMESTAMP;
l_end_date TIMESTAMP;
l_count INTEGER;
p_start_date varchar2(20);
p_end_date varchar2(20);
BEGIN
p_start_date := '11-JUN-2019';
p_end_date := '11-JUN-2019';
select to_timestamp_tz(p_start_date || ' 00:00:00 EUROPE/PARIS', 'DD-MON-YYYY HH24:MI:SS TZR')
into l_start_date
from dual;
select to_timestamp_tz(p_end_date || ' 23:59:59 EUROPE/PARIS', 'DD-MON-YYYY HH24:MI:SS TZR')
into l_end_date
from dual;
dbms_output.put_line(to_char(l_start_date, 'YYYY-MM-DD HH24:MI:SS') || '|' || to_char(l_end_date, 'YYYY-MM-DD HH24:MI:SS'));
select count(*)
into l_count
FROM all_scheduler_job_run_details
WHERE job_name = 'RANDOM_JOB'
and log_date >= l_start_date
and log_date <= l_end_date
;
dbms_output.put_line(l_count);
OPEN p_details FOR
SELECT owner, log_date, job_subname,
status, error# as error, req_start_date, actual_start_date,
run_duration, additional_info
FROM user_scheduler_job_run_details
WHERE log_date >= l_start_date
AND log_date <= l_end_date
AND job_name = 'RANDOM_JOB'
ORDER BY log_date DESC;
END p_get_job_run_details_test;