How this EXCEPTION works ?

Question

Hi All,
I have pl/sql like below, the problem is : even I try to produce NO_DATA_FOUND exception like below ( I expect to get error message : 'EMPLOYEE DOES NOT EXIST !!' )
BUT I always get : 'OTHER ERROR HAS OCCURED !!' (OTHER execption)
Why is that ?
Thank you very much,
xtanto
DECLARE
vEmpName VARCHAR2(30);
vDeptName VARCHAR2(30);
BEGIN
BEGIN
     select first_name into vEmpName from employees where employee_id = 1989;
     EXCEPTION WHEN NO_DATA_FOUND THEN RAISE_APPLICATION_ERROR(-20001, 'EMPLOYEE DOES NOT EXIST !!') ;
END;
BEGIN
     select department_name into vDeptName from departments where department_id = 999;
     EXCEPTION WHEN NO_DATA_FOUND THEN RAISE_APPLICATION_ERROR(-20001, 'DEPARTMENT DOES NOT EXIST !!') ;
END;
EXCEPTION
WHEN OTHERS THEN
RAISE_APPLICATION_ERROR(-20001, 'OTHER ERROR HAS OCCURED !!') ;
END;

Answer 1

Hi!
I'm giving you this sample demonstartion - you can go through this code. Hope it will help u to understand and that might answer your query --
SQL> ed
Wrote file afiedt.buf
  1  DECLARE
  2   vEmpName VARCHAR2(30);
  3   vDeptName VARCHAR2(30);
  4  BEGIN
  5   dbms_output.put_line('1');
  6   BEGIN
  7      dbms_output.put_line('2');
  8      select ename into vEmpName
  9      from emp
10      where empno = 1989;
11      dbms_output.put_line('3');
12   EXCEPTION
13    WHEN NO_DATA_FOUND THEN
14       RAISE_APPLICATION_ERROR(-20001, 'EMPLOYEE DOES NOT EXIST !!') ;
15   END;
16   BEGIN
17     dbms_output.put_line('4');
18     select dname into vDeptName
19     from dept
20     where deptno = 78;
21     dbms_output.put_line('5');
22   EXCEPTION
23    WHEN NO_DATA_FOUND THEN
24       RAISE_APPLICATION_ERROR(-20001, 'DEPARTMENT DOES NOT EXIST !!') ;
25   END;
26  EXCEPTION
27   WHEN OTHERS THEN
28     RAISE_APPLICATION_ERROR(-20001, 'OTHER ERROR HAS OCCURED !!') ;
29* END;
SQL> /
DECLARE
ERROR at line 1:
ORA-20001: OTHER ERROR HAS OCCURED !!
ORA-06512: at line 28And, now --
SQL> ed
Wrote file afiedt.buf
  1  DECLARE
  2   vEmpName VARCHAR2(30);
  3   vDeptName VARCHAR2(30);
  4  BEGIN
  5   dbms_output.put_line('1');
  6   BEGIN
  7      dbms_output.put_line('2');
  8      select ename into vEmpName
  9      from emp
10      where empno = 1989;
11      dbms_output.put_line('3');
12   EXCEPTION
13    WHEN NO_DATA_FOUND THEN
14       RAISE_APPLICATION_ERROR(-20001, 'EMPLOYEE DOES NOT EXIST !!') ;
15   END;
16   BEGIN
17     dbms_output.put_line('4');
18     select dname into vDeptName
19     from dept
20     where deptno = 78;
21     dbms_output.put_line('5');
22   EXCEPTION
23    WHEN NO_DATA_FOUND THEN
24       RAISE_APPLICATION_ERROR(-20001, 'DEPARTMENT DOES NOT EXIST !!') ;
25   END;
26  /*EXCEPTION
27   WHEN OTHERS THEN
28     RAISE_APPLICATION_ERROR(-20001, 'OTHER ERROR HAS OCCURED !!') ;*/
29* END;
SQL> /
DECLARE
ERROR at line 1:
ORA-20001: EMPLOYEE DOES NOT EXIST !!
ORA-06512: at line 14Regards.
Satyaki De.