Added date and modified date for Oracle table audit

问题

According to requirenments I need to support two mandatory columns for each table: ADDED_DATE, MODIFIED_DATE.
These are intended for DBA/auditing purposes.

Is it possible to make this stuff totally automatic, implicitly supported by DB itself when I'm inserting / updating records from within application?

回答1:

create a trigger on the table (before update for each row).

SQL> create table foo (hi varchar2(10), added_date date, modified_date date);

Table created.

SQL> create trigger foo_auifer
  2  before update or insert on foo
  3  for each row
  4  declare
  5  begin
  6    if (inserting) then
  7      :new.added_date := sysdate;
  8    elsif (updating) then
  9      :new.modified_date := sysdate;
 10    end if;
 11  end;
 12  /

Trigger created.

SQL> insert into foo (hi) values ('TEST');

1 row created.

SQL> insert into foo (hi) values ('TEST2');

1 row created.

SQL> update foo set hi = 'MODDED' where rownum  = 1;

1 row updated.

SQL> alter session set nls_date_format='dd-mon-yyyy hh24:mi:ss';

Session altered.

SQL> select * from foo;

HI         ADDED_DATE           MODIFIED_DATE
---------- -------------------- --------------------
MODDED     07-nov-2012 15:28:28 07-nov-2012 15:28:39
TEST2      07-nov-2012 15:28:30

SQL>

回答2:

create table "db_user"."my_table" (
    ...
    "added_date" date default sysdate,
    "modified_date" date default sysdate
)
/
create or replace
trigger "db_user"."trg_my_table_audit" 
before update on my_table for each row 
begin 
    :new.modified_date := sysdate;
end;

来源：https://stackoverflow.com/questions/13272711/added-date-and-modified-date-for-oracle-table-audit

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Oracle

ddl