Solved

Getting data for edited values in update trigger in sql server

Posted on 2014-03-21
4
4,192 Views
Last Modified: 2014-04-03
Hi ,
 
I am writing update trigger for tables in SQL server 2008 r2

i need to store values (Old value, new value ) in Log table.

How to get the old values  ?

CREATE TRIGGER trgAfterUpdate ON [dbo].[Employee_Test]
FOR UPDATE
AS
      declare @empid int;
      declare @empname varchar(100);
      declare @empsal decimal(10,2);
      declare @audit_action varchar(100);

      select @empid=i.Emp_ID from inserted i;      
      select @empname=i.Emp_Name from inserted i;      
      select @empsal=i.Emp_Sal from inserted i;      
      
      if update(Emp_Name)insert into insert into Emp_Audit
           (User_ID,System_Time,Affected_Table,Affected_Field,Old_Data,New_Data)
      values(@user_id,@InsertDate,'Emp','EMP_ID','',@empid);
      if update(Emp_Sal)
            insert into insert into Emp_Audit
           (User_ID,System_Time,Affected_Table,Affected_Field,Old_Data,New_Data)
      values(@user_id,@InsertDate,'Emp','EMP_sal','',@empsal);

      insert into insert into Emp_Audit
           (User_ID,System_Time,Affected_Table,Affected_Field,Old_Data,New_Data)
      values(@user_id,@InsertDate,'Emp','EMP_ID','',@empid);

      PRINT 'AFTER UPDATE Trigger fired.'
GO
0
Comment
Question by:Vikash p
  • 2
4 Comments
 
LVL 40

Accepted Solution

by:
Kyle Abrahams earned 167 total points
ID: 39945852
The old values will be stored in the deleted table.

http://technet.microsoft.com/en-us/library/ms191300.aspx
0
 
LVL 75

Assisted Solution

by:Anthony Perkins
Anthony Perkins earned 167 total points
ID: 39946681
The TRIGGER as designed is fatally flawed.  A TRIGGER fires per statement not per row.  Therefore in your case if your UPDATE statement affects more than one row it will fail.
0
 
LVL 69

Assisted Solution

by:Scott Pletcher
Scott Pletcher earned 166 total points
ID: 39951034
The trigger won't "fail", that is, it won't abend; it will just capture only one row's values instead of all of the changed rows.  [In SQL Server, there is no "FOR EACH ROW" trigger, not even as an option.]
0
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 39951983
The trigger won't "fail", that is, it won't abend; it will just capture only one row's values instead of all of the changed rows
Absolutely.  I should have clarified.
0

Featured Post

Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
Ever wondered why sometimes your SQL Server is slow or unresponsive with connections spiking up but by the time you go in, all is well? The following article will show you how to install and configure a SQL job that will send you email alerts includ…
Viewers will learn how to use the SELECT statement in SQL to return specific rows and columns, with various degrees of sorting and limits in place.
Viewers will learn how to use the UPDATE and DELETE statements to change or remove existing data from their tables. Make a table: Update a specific column given a specific row using the UPDATE statement: Remove a set of values using the DELETE s…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question