How to get the record count before fetch

Question

CREATE PACKAGE demo_cur_pkg AS
TYPE EmpName IS RECORD (name VARCHAR2(10));
TYPE cur_type IS REF CURSOR RETURN EmpName;
PROCEDURE open_emp_cur (
curs IN OUT cur_type,
dept_num IN NUMBER);
END;
CREATE PACKAGE BODY demo_cur_pkg AS
CREATE PROCEDURE open_emp_cur (
curs IN OUT cur_type,
dept_num IN NUMBER) IS
BEGIN
OPEN curs FOR
SELECT ename FROM emp
WHERE deptno = dept_num
ORDER BY ename ASC;
END;
END;
After this package has been stored, you can open the cursor curs by calling the open_emp_cur stored procedure from your Pro*C/C++ program, and FETCH from the cursor in the program. For example:
sql_cursor emp_cursor;
char emp_name[11];
EXEC SQL ALLOCATE :emp_cursor; /* allocate the cursor variable */
/* Open the cursor on the server side. */
EXEC SQL EXECUTE
begin
demo_cur_pkg.open_emp_cur(:emp_cursor, :dept_num);
end;
EXEC SQL WHENEVER NOT FOUND DO break;
for (;;)
EXEC SQL FETCH :emp_cursor INTO :emp_name;
printf("%s\n", emp_name);
Any solutioon is welcome

Answer 1

Fail to understand why you want to introduce exception processing - e.g. use methodA for less than 10,000 rows and use methodB for 10,000 and more.
Why not use methodC - optimal support for fetching, irrespective of whether there are 1 row to fetch, or a 100,000 rows?
There is no best way for fetching a small number of rows versus a different best way for fetching more rows. There is a single optimal method - and this remains the same irrespective of the number of rows being returned.