Help on Procedure and trigger for updating(urgent please)

Question

SQL> / Table A
CTUT_ID CTUT_COMPANY_NAME CURRT_USER_ID FMIS_ID CREATE_DA UPDATE_BY UPDATE_DATE
1234 A 15-APR-03
2222 B 15-APR-03
3333 C 15-APR-03
4444 D 15-APR-03
5555 E 15-APR-03
6666 F 15-APR-03
150282 G oRACLE 23-APR-03
1 H 15-APR-03
2 I 15-APR-03
3 J 15-APR-03
150343 K TIGER 24-APR-03
150305 L EXAMPLE 23-APR-03
150342 M SCOTT 24-APR-03
sQL >/ Table B
Empno     Empname UPDATE_BY UPDATE_DATE
1 AA
2 BB
3 CC
4 DD
What i need to do is i need to create an update trigger on both tables
like create a procedure
1)In procedure i need to check like
IF TABLEA.CURRT_USER_ID = (SELECT USER FROM DUAL)
THEN
UPDATE_BY = (CURRENT_USER_ID of CTUT_ID)
FOR EXAMPLE CURRENT USER_ID IS SCOTT THEN
UPDATE_BY = 150342
UPDATE_DATE = SYSDATE
ELSIF
UPDATE_BY <=> (CURRENT_USER_ID of CTUT_ID)
THEN
MESSAGE('USER IS NOT IN TABLE);
END IF;
and call that procedure in the update triggers
FOR BOTH TABLES TABLEA,TABLEB
i CREATED A PROCEDURE BUT IT IS NOT WORKING
ANY HELP PLEASE
CREATE OR REPLACE PROCEDURE UPDATE(
UPDATE_DATE out DATE,
UPDATE_BY out VARCHAR2)
IS
Uuser varchar2(20);
Udate date;
Ufound number(1);
BEGIN
SELECT USER,SYSDATE
INTO Uuser,Udate from dual;
SELECT count(*),CTUT_ID into Ufound,Uctut_id
FROM TABLEA
WHERE CURRT_USER_ID = Uuser
Group by Ctut_id;
IF (UFOUND = 1) THEN
UPDATE_DATE := UDATE;
UPDATE_BY := UCTUT_ID;
END IF;
EXCEPTION WHEN NO_DATA_FOUND THEN
RAISE_APPLICATION_ERROR(-20001,'User Does not Exist');
END UPD_CONSTITUENT;
CREATE A TRIGGER :
CREATE OR REPLACE TRIGGER TU
BEFORE INSERT ON TABLEA
FOR EACH ROW
BEGIN      
UPDATE(:NEW.update_date,
     :NEW.update_BY);
END IF;      
END;
SQL> update TABLEA
2 set CTUT_COMPANY_NAME = 'SCOTT TEST'
3 WHERE FMIS_USER_ID = 'N';
update TABLEA
ERROR at line 1:
ORA-04091: table TABLEA is mutating, trigger/function may not see it
ORA-06512: at "UPDATE", line 12
ORA-06512: at "TU", line 1
ORA-04088: error during execution of trigger 'TU'

Answer 1

Hi Mara,
You are right thats what i want
I have a table A
EmpNo Empname Currtuser_id Update_date Updateby
1 Denis Oracle
2 Scott Scott
3 Mara MMara
1)what i need to do is when any user tries to update the table Table A
Then the Trigger or procedure should check whether user is exits in table A in column currtuser_id
If his user id exits in table A
Then allow him to update the TABLE A
and insert his EMPNO in UPDATE_BY
and SYSDATE in UPDATE_BY
He will do all this process using forms
But i need to have trigger or procedure in database level for table
2) I have another table like 10 tables
Suppose TABLE B
When user tries to update TABLE B
Then the Trigger or procedure should check whether user is exits in table A in column currtuser_id
If his user id exits in table A
Then allow him to update the TABLE B
and insert his EMPNO in UPDATE_BY
and SYSDATE in UPDATE_BY
3) I need to have a common Procedure and call that procedure in all tables in UPDATE TRIGGER
Thanks for your help
Thanks