Store the procedure to take place the functioning of certain values in the column.

Hello

Can someone tell me please how to do this?
I have three 1:emp(empno,ename,deptno,sal) of table
2:emp_changes(empno,ChangeTime(timestamp),Operation(VARCHAR2))
3:emp_metadata(TableName(varchar),MaxTime(timestamp))

I want to create a trigger that will follow any DML operation on the emp table and add a line for each empno (as main in emp), operation timstamp operation and the name of the operation (Insert, update, or delete) in the emp_changes table.
As it will insert or update in table emp_metadata with the name of the table and the maximum time of table emp_changes.

emp_changes table will be that a single row.if there is no line it will insert in the contrary case, it will update this line.

anone can you please write this trigger for me?

Thank you
Madam.

Published by: Nico on August 9, 2010 04:15

Try this:

SQL> create or replace trigger my_emp_trig after insert or update or delete on emp
  2  for each row
  3  declare
  4  v_empno NUMBER := 0;
  5  v_systimestamp TIMESTAMP := SYSTIMESTAMP;
  6  v_meta_cnt NUMBER := 0;
  7  begin
  8  BEGIN
  9  SELECT empno INTO v_empno FROM emp_Change where empno = :new.empno;
 10  exception
 11  when no_Data_found then
 12  v_empno := 0;
 13  end;
 14  IF (v_empno = 0) THEN
 15  IF INSERTING THEN
 16  insert into emp_change values(:new.empno,v_systimestamp,'INSERT');
 17  ELSIF UPDATING THEN
 18  insert into emp_change values(:new.empno,v_systimestamp,'UPDATE');
 19  ELSE
 20  insert into emp_change values(:new.empno,v_systimestamp,'DELETE');
 21  END IF;
 22  SELECT COUNT(*) INTO v_meta_cnt from emp_metadata where tablename = 'EMP';
 23  IF (v_meta_cnt = 0) THEN
 24  insert into emp_metadata values('EMP',v_systimestamp);
 25  ELSE
 26  update emp_metadata set maxtime = v_systimestamp where tablename = 'EMP';
 27  END IF;
 28  ELSE
 29  IF INSERTING THEN
 30  update emp_change set operation='INSERT',changetime=v_systimestamp
 31  WHERE empno = :new.empno;
 32  UPDATE emp_metadata set maxtime = v_systimestamp where tablename = 'EMP';
 33  ELSIF UPDATING THEN
 34  update emp_change set operation='UPDATE',changetime=v_systimestamp
 35  WHERE empno = :new.empno;
 36  UPDATE emp_metadata set maxtime = v_systimestamp where tablename = 'EMP';
 37  ELSE
 38  update emp_change set operation='DELETE',changetime=v_systimestamp
 39  WHERE empno = :new.empno;
 40  UPDATE emp_metadata set maxtime = v_systimestamp where tablename = 'EMP';
 41  END IF;
 42  END IF;
 43  end;
 44  /

Trigger created.

SQL> insert into emp values(1,'A',1000);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from emp_change;

     EMPNO CHANGETIME                                                                  OPERATION
---------- --------------------------------------------------------------------------- ----------
         1 06-AUG-10 06.59.04.696958 AM                                                INSERT

SQL> select * from emp_metadata;

TABLENAME
----------------------------------------------------------------------------------------------------
MAXTIME
---------------------------------------------------------------------------
EMP
06-AUG-10 06.59.04.696958 AM

SQL> insert into emp values (2,'B',1000);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from emp_change;

     EMPNO CHANGETIME                                                                  OPERATION
---------- --------------------------------------------------------------------------- ----------
         1 06-AUG-10 06.59.04.696958 AM                                                INSERT
         2 06-AUG-10 06.59.28.532472 AM                                                INSERT

SQL> select * from emp_metadata;

TABLENAME
----------------------------------------------------------------------------------------------------
MAXTIME
---------------------------------------------------------------------------
EMP
06-AUG-10 06.59.28.532472 AM

SQL> update emp set sal = 20000 where empno = 1;

1 row updated.

SQL> commit;

Commit complete.

SQL> select * from emp_change;

     EMPNO CHANGETIME                                                                  OPERATION
---------- --------------------------------------------------------------------------- ----------
         1 06-AUG-10 06.59.51.060050 AM                                                UPDATE
         2 06-AUG-10 06.59.28.532472 AM                                                INSERT

SQL> select * from emp_metadata;

TABLENAME
----------------------------------------------------------------------------------------------------
MAXTIME
---------------------------------------------------------------------------
EMP
06-AUG-10 06.59.51.060050 AM

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