Trigger not working as expected

Question

create or replace trigger EMP_B4
  before insert on SCOTT.EMP 
  for each row
  when (NEW.SAL IS NULL)
declare
  -- local variables here
  i NUMBER;
begin
  :NEW.SAL := 22222;
end EMP_B4;Hi,
The trigger is not working; when an entry inserted with SAL null, I should see the salary set to default 22222. But sometimes, it dont work and SAL remains as NULL.
Anyone encountered similar case before?
Message was edited by:
[email protected]

Answer 1

Hi,
Here is what i have done. I have used your trigger as;
SQL> create or replace trigger EMP_B4
2 before insert on SCOTT.EMP
3 for each row
4 when (NEW.SAL IS NULL)
5 declare
6 -- local variables here
7 i NUMBER;
8 begin
9 :NEW.SAL := 22222;
10* end EMP_B4;
11 /
Trigger created.
SQL> insert into emp (empno,deptno) values (111,10);
1 row created.
SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
111 22222 10
211 yogesh analyst 7369 12-DEC-05 22222 10 20
SQL> insert into emp values (211,'yogesh','analyst',7369,'12-dec-2005','',10,20);
1 row created.
SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
111 22222 10
211 yogesh analyst 7369 12-DEC-05 22222 10 20
See, again it's working fine. Can you give a case where your trigger has not workrd properly.