PL/SQL Cursor just check if value is greater than a value - plsql

Question

I want
to make a procedure check if exist empno from table employees
with emno greater than 100. If exist at least one, i want
to exit from the loop.
How can I modify the following code ?
Is it problem I don;t use %NOTFOUND , %ROWCOUNT ?
CREATE OR REPLACE procedure check_value
IS
cursor c1 is
select *
from employess;
c1_values c1%ROWTYPE;
BEGIN
open c1;
fetch c1 into c1_values;
loop
if c1_values.EMPNO > 100 then
DBMS_OUTPUT.put_line ('Found row with empno > 100');
end if;
end loop;
close c1;
END;

Answer 1

If you just need to check if you have a record which has empno over 100 you can use EXISTS statement e.g.
DECLARE
CURSOR c1 IS
SELECT
CASE
WHEN EXISTS (
SELECT
1
FROM
employees
WHERE
empno > 100
) THEN 1
ELSE 0
END AS empno_exists
FROM
dual;
ln_empno_exists PLS_INTEGER;
BEGIN
OPEN c1;
FETCH c1 INTO ln_empno_exists;
CLOSE c1;
DBMS_OUTPUT.PUT_LINE('Empno over 100 exists: '||CASE WHEN ln_empno_exists = 1 THEN 'TRUE' ELSE 'FALSE' END);
END;
/
EDIT: If you want to fetch the rows with some conditions, you simply need to adjust your WHERE clause in your SELECT statement. Here you have an example with some ways to iterate through the records fetched:
DECLARE
CURSOR c1 IS
SELECT
emp.*
FROM
employees emp
WHERE
empno > 100
;
lr_c1_rec c1%ROWTYPE;
BEGIN
-- Using FOR loop
DBMS_OUTPUT.PUT_LINE('START: Printing employees records where empno > 100');
FOR rec IN c1
LOOP
DBMS_OUTPUT.PUT_LINE('empno = '||rec.empno);
END LOOP;
DBMS_OUTPUT.PUT_LINE('END: Printing employees records where empno > 100');
-- Using a LOOP with EXIT clause
DBMS_OUTPUT.PUT_LINE('START: Printing employees records where empno > 100');
OPEN c1;
LOOP
FETCH c1 INTO lr_c1_rec;
-- exit the loop when your cursor doesn't have any more records to be returned
EXIT WHEN c1%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('empno = '||lr_c1_rec.empno);
END LOOP;
DBMS_OUTPUT.PUT_LINE('END: Printing employees records where empno > 100');
-- Using WHILE loop
DBMS_OUTPUT.PUT_LINE('START: Printing employees records where empno > 100');
OPEN c1;
FETCH c1 INTO lr_c1_rec;
-- As long as cursor returns any values, iterate through the records returned
WHILE c1%FOUND
LOOP
DBMS_OUTPUT.PUT_LINE('empno = '||lr_c1_rec.empno);
END LOOP;
DBMS_OUTPUT.PUT_LINE('END: Printing employees records where empno > 100');
END;
/

Answer 2

Just add an EXIT statement after you've found your value:
CREATE OR REPLACE procedure check_value IS
cursor c1 is
select *
from employess;
c1_values c1%ROWTYPE;
BEGIN
open c1;
loop
fetch c1 into c1_values;
IF c1%NOTFOUND THEN EXIT;
if c1_values.EMPNO > 100 then
DBMS_OUTPUT.put_line ('Found row with empno > 100');
EXIT;
end if;
end loop;
-- The EXIT statement will drop you out of the loop and leave you here
close c1;
END;
Note that I moved the fetch inside the loop and added a %NOTFOUND check. Without the %NOTFOUND the code would never know the cursor was out of data and would probably go into an infinite loop.

Answer 3

Why to define cursor and then open and fetch when it can be done by just
SQL But if it is required so then use FOR loop and EXIT condition
as mentioned
below. Hope it helps
CREATE OR REPLACE PROCEDURE check_value
IS
BEGIN
FOR I IN
(SELECT * FROM employess
)
LOOP
IF I.EMPNO > 5 THEN
DBMS_OUTPUT.put_line ('Found row with empno > 100');
EXIT;
END IF;
END LOOP;
END;