Exception is not getting called in plsql - exception

Question

I am a beginner in plsql. The code below runs without any compilation error but the notFoundException is not getting called. Any help would be appriciated.
declare
abc exception;
notFoundException exception;
cursor c1(dd number) is select first_name from employees where salary = dd;
begin
for i in c1(&t)
loop
if(c1%rowcount!=1) then
raise abc;
elsif(c1%notfound) then
raise notFoundException;
else
dbms_output.put_line(i.first_name);
end if;
end loop;
Exception
when abc then
dbms_output.put_line('abc');
insert into messages values('too many rows exception');
when notFoundException then
dbms_output.put_line('notFoundException');
insert into messages values('Nobody with this salary : ');
end;
/

Answer 1

You may use the below anonymous block and try
`SET SERVEROUTPUT ON;
DECLARE
first_name_in employees.first_name%ROWTYPE;
Salary_in employees.salary%ROWTYPE;
BEGIN
Salary_in:=&Salary;
SELECT first_name
INTO first_name_in
FROM employees
WHERE salary = Salary_in;
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('Nobody with this salary :'||Salary_in);
INSERT
INTO messages
VALUES ('NO_DATA_FOUND exception');
WHEN TOO_MANY_ROWS THEN
DBMS_OUTPUT.PUT_LINE('Too many with this salary :'||Salary_in);
INSERT
INTO messages
VALUES ('TOO_MANY_ROWS exception');
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE('select failed with error'||SUBSTR(SQLERRM,1,100))
INSERT
INTO messages
VALUES (SUBSTR(SQLERRM,1,100));
COMMIT;
END;
/`

Answer 2

You don't need to use cursor attributes when using FOR LOOP. You could just query the records and make decision afterwards. Here is a running example (I didn't have the employees table, so made up a stub). The convenient thing about FOR LOOP is that you don't have to worry about closing the cursor.
DECLARE
abc EXCEPTION;
notfoundexception EXCEPTION;
CURSOR c1(dd NUMBER) IS
SELECT *
FROM (SELECT MOD(rownum, 3) salary
,rownum first_name
FROM dual
CONNECT BY LEVEL < 10)
WHERE salary = dd;
v_count NUMBER := 0;
BEGIN
FOR i IN c1(2) LOOP
v_count := v_count + 1;
IF (v_count > 1) THEN
RAISE abc;
END IF;
dbms_output.put_line(i.first_name);
END LOOP;
IF (v_count = 0) THEN
RAISE notfoundexception;
END IF;
EXCEPTION
WHEN abc THEN
dbms_output.put_line('abc');
--insert into messages values('too many rows exception');
WHEN notfoundexception THEN
dbms_output.put_line('notFoundException');
--insert into messages values('Nobody with this salary : ');
END;
/

Answer 3

I suggest you to read about cursors in PL/SQL.
A cursor for loop will loop through every record that is retrieved in the cursor. If no data is found, execution will never proceed inside the loop, hence no data found exception will not be raised inside the loop. Your code should be like this
declare
abc exception;
notFoundException exception;
lv_first_name varchar2(240);
cursor c1(dd number) is select first_name from employees where salary = dd;
begin
open c1;
fetch c1 into lv_first_name;
if(c1%rowcount > 1) then
raise abc;
elsif(c1%notfound) then
raise notFoundException;
else
dbms_output.put_line(lv_first_name);
end if;
close c1;
Exception
when abc then
dbms_output.put_line('abc');
insert into messages values('too many rows exception');
when notFoundException then
dbms_output.put_line('notFoundException');
insert into messages values('Nobody with this salary : ');
end;