Question

my update trigger is as below .

CREATE TRIGGER [dbo].[tb_sample_UpdationTrigger] on [dbo].[tb_sample]  for UPDATE
as
 if UPDATE(R_Id) 
 insert into dbo.test_log(Attribute,Action,OldValue,NEwValue,UserId,ModifiedDate)   

(SELECT 'R_Id','update',tb_sample.R_Id,inserted.R_Id ,1,GETDATE()
 from inserted 
 inner join tb_sample on inserted.id =tb_sample.id)

. I update the R_Id from 100000 to 200000 . But record inserted to the log table is

   R_Id update  200000      200000      1   2012-01-20 12:38:16.730 

If we see the old value and new value both are 200000 .
Wats wrong here ?

Answer 1

If you want to get the old value you have to use the deleted special table, since an update can be seen as a delete and an insert action. See: Using the inserted and deleted Tables. So your select should look like (untested):

SELECT 'R_Id','update', d.R_Id, i.R_Id ,1,GETDATE()
FROM inserted i
INNER JOIN deleted d ON d.id=i.id
INNER JOIN tb_sample ON tb_sample.id=i.id