Need Column name , old value and new value in Trigger - oracle

Question

Our requirement is if any 1 of the column name in table is updating we need to insert the column name in another table so I had written this code
CREATE OR REPLACE TRIGGER Test AFTER
UPDATE ON XX_table
FOR EACH Row
BEGIN FOR C IN
(SELECT column_name
FROM User_Tab_Columns
WHERE Upper(Table_Name) = 'XX_table_name' ORDER BY column_id ASC)
LOOP
IF Updating (c.column_name)
THEN
INSERT INTO Xx_Trigger_table (Rt_Id ,Updated_Column ,updated_status) VALUES(:Old.Rt_Id,C.Column_Name,'Y');
END IF;
END LOOP;
END;
Now Client need Old value as well as new value in the XX_Trigger_Table.I cant Write
INSERT INTO Xx_Trigger_table (Rt_Id ,Updated_Column ,updated_status,old_value, new_value) VALUES(:Old.Rt_Id,C.Column_Name,'Y',:old.c.column_name,:new.c.column_name);
Please suggest me some idea to insert new and old value in the table.
Thanks in Advance.

Answer 1

If you are following this approach , like #Alex Poole suggested you will have to include all the columns that you would like to log. Please see this procedure and the output of it.
CREATE OR REPLACE TRIGGER Test1 AFTER
UPDATE ON TESTEMP
FOR EACH Row
BEGIN FOR C IN
(SELECT column_name
FROM User_Tab_Columns
WHERE Upper(Table_Name) = 'TESTEMP' ORDER BY column_id ASC)
LOOP
IF Updating (c.column_name) then
IF (c.column_name='EMPNO') then
INSERT INTO test_audit (col_name,old_val,new_val,upd_stat) VALUES (C.column_name,:Old.empno,:New.empno,'Y');
ELSIF
(c.column_name='ENAME') then
INSERT INTO test_audit (col_name,old_val,new_val,upd_stat) VALUES (C.column_name,:Old.ENAME,:New.ENAME,'Y');
ELSIF
(c.column_name='MGR') then
INSERT INTO test_audit (col_name,old_val,new_val,upd_stat) VALUES (C.column_name,:Old.MGR,:New.MGR,'Y');
END IF;
END IF;
END LOOP;
END;
SQL> select * from testemp;
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
SQL> select * from test_audit;
no rows selected
SQL> update testemp set empno=6677 , ename='JUPITER' where empno=1234;
1 row updated.
SQL> COMMIT;
Commit complete.
SQL> select * from test_audit;
COL_NAME OLD_VAL NEW_VAL U
---------- ---------- ---------- -
EMPNO 1234 6677 Y
ENAME SMITH JUPITER Y