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"Date Modified" column

Posted on 2008-09-30
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Last Modified: 2012-05-05
On SQL Server 2005, looking for the easiest way to add a "date modified" column for all table rows. If adding a trigger is the only way please provide trigger definition/t-sql.
thanks!
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Question by:GEHC
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Guy Hengel [angelIII / a3] earned 250 total points
ID: 22608552
yes, a trigger is the way to go:
CREATE TRIGGER trg_update_yourtable
 ON yourtable
 FOR UPDATE
AS
  UPDATE t
    SET date_modified = GETDATE()
   FROM yourtable t
   JOIN INSERTED i
     ON t.primary_key_field = i.primary_key_field
    AND t.date_modified < GETDATE()

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Assisted Solution

by:BrandonGalderisi
BrandonGalderisi earned 250 total points
ID: 22608597
Adding the Date modified column is the easy part.


alter table YourTable
add last_modified_Dttm datetime null

I use null and no default because I want to differentiate between a record that was and was not modified.

I then leave the update of the last_modified_dttm column to the update stored procedure on the table as ALL of my data access goes through SPs.
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Expert Comment

by:adlink_la
ID: 22608744
If all you want is to have the date_modified column updated, I would go with Brandons approach and set the value in your update procedure.  I would stay away from triggers unless you absolutely need them as they can cause performance problems.  
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Expert Comment

by:BrandonGalderisi
ID: 22608771
Triggers are necessary if you don't have absolute control over EVERY (which should be 1) method of updating the data though.  Such as applications with embedded SQL.
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Author Closing Comment

by:GEHC
ID: 31501697
Yes, I am  developer not a DBA and it IS an app I am having to rewrite. But its mission and task specific not user heavy. I can possible try both approaches. I was hoping though that SQL 2005 had something built -in/update row version.
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