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reason you can t or prefer not to use SQL Server Audit you can develop your own auditing solution by using triggers . In the previous example, in which I discussed the COLUMNS_UPDATED function, I provided a technique to identify which columns appeared as the target for the modification in the SET clause of the triggering UPDATE statement . You might want to use that technique for auditing . However, you might want to audit actual changes in column values and not just the fact that a column was a target of a modification . To demonstrate the technique that will allow you to achieve such auditing, first run the following code creating the tables T1 and T1_Audit:

(header/footer content)

SET NOCOUNT ON; USE tempdb; IF OBJECT_ID('dbo.T1', 'U') IS NOT NULL DROP TABLE dbo.T1; IF OBJECT_ID('dbo.T1Audit', 'U') IS NOT NULL DROP TABLE dbo.T1Audit; CREATE TABLE ( keycol INT intcol INT varcharcol ); dbo.T1 NOT NULL PRIMARY KEY, NULL, VARCHAR(10) NULL

CREATE TABLE dbo.T1Audit ( lsn INT NOT NULL IDENTITY PRIMARY KEY, -- log serial number keycol INT NOT NULL, colname sysname NOT NULL, oldval SQL_VARIANT NULL, newval SQL_VARIANT NULL );

Run the following code to create the trigger trg_T1_U_Audit, which records audit information about updates against T1 in T1Audit:

(block of content)

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CREATE TRIGGER trg_T1_u_audit ON dbo.T1 FOR UPDATE AS -- If 0 affected rows, do nothing IF NOT EXISTS(SELECT * FROM inserted) RETURN; INSERT INTO dbo.T1Audit(keycol, colname, oldval, newval) SELECT * FROM (SELECT I.keycol, colname, CASE colname WHEN N'intcol' THEN CAST(D.intcol AS SQL_VARIANT) WHEN N'varcharcol' THEN CAST(D.varcharcol AS SQL_VARIANT) END AS oldval, CASE colname WHEN N'intcol' THEN CAST(I.intcol AS SQL_VARIANT) WHEN N'varcharcol' THEN CAST(I.varcharcol AS SQL_VARIANT) END AS newval

In this exercise, you will adjust the screen orientation of your Tablet PC, as well as modify the application sequence in which the orientation changes.

FROM inserted AS I JOIN deleted AS D ON I.keycol = D.keycol CROSS JOIN (SELECT N'intcol' AS colname UNION ALL SELECT N'varcharcol') AS C) AS D WHERE oldval <> newval OR (oldval IS NULL AND newval IS NOT NULL) OR (oldval IS NOT NULL AND newval IS NULL); GO

The trigger s code first checks whether zero rows were affected by the triggering UPDATE statement . If that is the case, it aborts . There s nothing to audit if nothing changed . The code then uses a query that joins inserted and deleted by matching their keycol values . The query uses an unpivoting technique to rotate each column value from both inserted and deleted to its own row . The query filters only rows where the new value is different than the old value, taking NULLs into consideration as well . An INSERT statement inserts the result of the query into the audit table . To test the audit trigger, first insert a few rows to T1:

(individual page template)

INSERT INTO dbo.T1(keycol, intcol, varcharcol) VALUES (1, 10, 'A'), (2, 20, 'B'), (3, 30, 'C');

Then issue the following UPDATE:

UPDATE dbo.T1 SET varcharcol = varcharcol + 'X', intcol = 40 - intcol WHERE keycol < 3;

Query the table T1:

(block of content)

SELECT * FROM dbo.T1;

This generates the following output:

Query the table T1Audit:

and one page sequence. Our page sequence will contain a single page showing the same information as our HTML page did. Listing 5.11 contains the complete formatting tree XSL stylesheet to produce the U.S. English version of the watch list page in PDF format.

SELECT * FROM dbo.T1Audit;

This generates the following output:

2 3 4

lsn ---1 2 3 keycol ------2 1 1 colname ----------varcharcol intcol varcharcol oldval ------B 10 A newval ------BX 30 AX

< xml version="1.0" > <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" xmlns:fo="http://www.w3.org/1999/XSL/Format" > <xsl:template match ="/">

As you can see, only column values that actually changed were audited . Tip Suppose that your trigger performs an integrity check and issues a rollback if the integrity

rule is violated . And suppose that you still want to audit the attempt even though you re rolling it back . Of course, a rollback issued after the auditing activity will also roll back the auditing activity . On the other hand, if the rollback is issued before the auditing activity, inserted and deleted will be empty after the rollback, and you ll be left with no data to audit . You can use table variables to help resolve this situation . Table variables like any variables are not affected by a rollback because they are not considered part of an external transaction . Upon detection of the integrity rule violation, copy the contents of inserted and deleted into your own table variables; issue the rollback; and then, in a new transaction within the trigger, audit that data .

When you re done, run the following code for cleanup:

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