How To Find Out Table Name At Database Level Trigger

Question

Table Name
How do I will come to know the name of table on which currently DML statement is fired ?
e. g. My current user is SCOTT. So Scott should realize the event of DML Statement fired. Hence my question is how the trigger on User Level is to be written & how to catch the event & table name on which the statement is being executed.
Suppose my table is as follows
Table Name : EMP
EMPNO number
ENAME varchar2(10)
JOB varchar2(9)
MGR number
HIREDATE date
SAL number
COMM number
DEPTNO number
Bcd number
Brcd number
Rec_id number
Scn_no number
Sequences for above table
1. EMP_REC_ID - minimum value is 1 increment by 1 & max value is unlimited
2. EMP_SCN_NO - minimum value is 1 increment by 1 & max value is unlimited
I have written a trigger as follows :
CREATE OR REPLACE TRIGGER UPD_EMP_REC_SCN BEFORE INSERT OR UPDATE OR DELETE ON EMP REFERENCING NEW AS NEW OLD AS OLD FOR EACH ROW
DECLARE
BEGIN
IF (INSERTING) THEN
SELECT EMP_REC_ID.NEXTVAL INTO :NEW.REC_ID FROM DUAL;
ELSIF (UPDATING) THEN
SELECT EMP_SCN_NO.NEXTVAL INTO :NEW.SCN_NO FROM DUAL;
ELSIF (DELETING) THEN
INSERT INTO DELETED_ROWS (TAB_NAME, BCD, BRCD, REC_ID)
VALUES (‘EMP’, :OLD.BCD, :OLD.BRCD, :OLD.REC_ID);
END IF;
END;
Hence My problem is
If my database user contains 800 tables then I have to write down 800 triggers (i.e. for each table).
I want to write only one trigger at database level so that I can dynamically take actions, for this I need table name and the event on which the dml event has taken place.
Any help in this matter will be greatly appreceiated.
Regards
Vikrant

Answer 1

You cannot write a single trigger that applies to multiple tables. If you need a trigger for every table, you will need to generate 800 triggers.
Rather than manually generating 800 triggers, you might write a code generator that generates triggers for each of the tables by querying the data dictionary (i.e. DBA_TABLES, DBA_TAB_COLS, etc).
Justin