Re: Audit logging an adp
- From: Merlin <evalua@xxxxxxxxxxxxxxxx>
- Date: Sun, 3 Sep 2006 16:32:01 -0700
Thanks David
Looks like there isn't going to be any easy solution.
Thanks for the sample code showing me how to get the value of Text fileds.
"David Portas" wrote:
Merlin wrote:.
Hello
I need to add an audit trail to an existing, large adp application, which
was developed in AccessXP with a SQLServer 2000 backend.
I searched through all the Access pages and found numerous reference to
Allen Browne's audit code.
This is very much the sort of log I would like to keep, but his solution
won't work in an adp for a couple of reasons:
* You need client side tempTables, which, as far as I can see, can not exist
in an adp;
* There are issues with event ordering; and
* Autonumbering happens too late in new records to get the new ID.
I was wondering if anyone has adapted Allen Browne's solution for .ADPs, or
if anyone can suggest an alternative method.
Some people may be tempted to suggest using SQL Server triggers, so I'll
jump in early and say they won't help me for these reasons:
* All connections to the SQL Server are done through a single account, so I
can't get the user ID of the person making the change; and
* Most of the tables contain NText and Text fields that will need to be
auditted, and the triggers don't let you see the value of fields of that type
Thank you
Triggers are the obvious solution. You can easily detect updates to
TEXT columns using the UPDATE function. It is slightly harder to track
actual changes to TEXT columns because they aren't exposed in the
INSERTED and DELETED virtual tables but it can still be done by
preserving the TEXT value for each update (see below).
By definition to accomplish any reliable kind of audit you need some
form of access control. In a two-tier environment access control
usually means some combination of either user roles, application roles
and/or EXECUTE-only permission through procedures. If you aren't
familiar with all these options then do read about users and roles in
Books Online. It is not easy to add security as an afterthought because
security needs to be factored in to your whole application
architecture, but without an adequate security model your audit trail
will be wide open to abuse.
In your case it sounds like you have your own application-level
security model. To audit user activity you'll therefore have to pass
the user name to a stored procedure for each auditable event or update
it as a column value in each table you want to audit.
Hope this helps.
CREATE TRIGGER trg ON tbl for UPDATE, INSERT
AS
IF UPDATE(text_col)
BEGIN;
INSERT INTO dbo.audit (key_col,text_col)
SELECT key_col,text_col FROM dbo.tbl
WHERE EXISTS
(SELECT *
FROM inserted AS i
JOIN dbo.tbl AS t
ON i.key_col = t.key_col);
END;
GO
--
David Portas, SQL Server MVP
Whenever possible please post enough code to reproduce your problem.
Including CREATE TABLE and INSERT statements usually helps.
State what version of SQL Server you are using and specify the content
of any error messages.
SQL Server Books Online:
http://msdn2.microsoft.com/library/ms130214(en-US,SQL.90).aspx
--
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