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How to join INFORMATION_SCHEMA.COLUMNS, COLUMNS_UPDATED ( ), inserted and deleted tables


How to join INFORMATION_SCHEMA.COLUMNS, COLUMNS_UPDATED ( ), inserted and deleted tables

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diallonina
diallonina
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Hi Smile

On google, i found a script for Update Trigger without using a Cursor (). Line 32 to 74

http://beyondrelational.com/modules/2/blogs/71/posts/11988/how-to-find-the-right-columns-updated.aspx

And here is my problem: I want to use COLUMNS_UPDATED () with deleted et inserted tables to get the old value and the new on in the XML.

<Fields> 
<ColumnName>
<OldValue = "oldValue"/>
<NewValue = "newValue"/>
</ColumnName>
</Fields>



CREATE TRIGGER [dbo].[tr_EmpHistory] ON [dbo].[employeeData] 
FOR UPDATE
AS
BEGIN
DECLARE @FieldsUpdated XML
DECLARE @ColumnsUpdated VARBINARY(100)

SET @ColumnsUpdated = COLUMNS_UPDATED()

SET @FieldsUpdated = (
SELECT Colonne.COLUMN_NAME AS Name from

INFORMATION_SCHEMA.COLUMNS Colonne
WHERE TABLE_NAME = 'employeeData'
AND (
sys.fn_IsBitSetInBitmask (
@ColumnsUpdated, COLUMNPROPERTY(OBJECT_ID('dbo' + '.' + TABLE_NAME), COLUMN_NAME, 'ColumnID')) <> 0
)
FOR XML AUTO, ROOT('Fields')
)

INSERT INTO auditEmployeeData
(
audit_emp_id,
audit_emp_bankAccountNumber,
audit_emp_salary,
audit_emp_SSN,
audit_emp_lname,
audit_emp_fname,
audit_emp_manager,
ColumnsUpdated
)

SELECT
emp_id,
emp_bankAccountNumber,
emp_salary,
emp_SSN,
emp_lname,
emp_fname,
emp_manager,
@FieldsUpdated
FROM INSERTED
END



Need your help please. Thank you !
Eirikur Eiriksson
Eirikur Eiriksson
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There is a much simpler way of doing this and it also allows for multiple multi-row actions, the COLUMNS_UPDATED makes that difficult (tip: if there is a variable in the trigger used for the output, most likely its a one-row-only trigger). Here is a simple example which uses NULLIF to compare the old and the new value, ignoring the column if the values are the same.
Cool

USE tempdb;
GO
SET NOCOUNT ON;

CREATE TABLE dbo.UpdateTriggerTest
(
UTT_ID INT IDENTITY(1,1) NOT NULL CONSTRAINT PK_UTT_ID PRIMARY KEY CLUSTERED
,UTT_VALUE_1 INT NOT NULL
,UTT_VALUE_2 INT NOT NULL
,UTT_VALUE_3 INT NULL
,UTT_VALUE_4 INT NULL
,UTT_VALUE_5 INT NULL
);

CREATE TABLE dbo.UTT_AUDIT
(
UTT_AUDIT_ID INT IDENTITY(1,1) NOT NULL CONSTRAINT PK_UTT_AUDIT_ID PRIMARY KEY CLUSTERED
,UTT_AUDIT_DATE DATETIME2(7) NOT NULL CONSTRAINT DFLT_DBO_UTT_AUDIT_UTT_AUDIT_DATE DEFAULT(SYSDATETIME())
,UTT_ID INT NOT NULL
,UTT_ACTION_XML XML NOT NULL
);
GO

CREATE TRIGGER dbo.TRG_CATCH_UPDATE_UpdateTriggerTest
ON dbo.UpdateTriggerTest
/* Catch any changes to the UTT_VALUE_x columns */
AFTER UPDATE,DELETE
AS
IF (SELECT COUNT(*) FROM inserted) > 0 AND (SELECT COUNT(*) FROM deleted) > 0
BEGIN
-- UPDATE
INSERT INTO dbo.UTT_AUDIT (UTT_ID,UTT_ACTION_XML)
SELECT
DD.UTT_ID
,(
SELECT
'UPDATE' AS '@COL_ACTION'
,NULLIF(D.UTT_VALUE_1,I.UTT_VALUE_1) AS 'UTT_VALUE_1/@OLD_VALUE'
,NULLIF(I.UTT_VALUE_1,D.UTT_VALUE_1) AS 'UTT_VALUE_1/@NEW_VALUE'

,NULLIF(D.UTT_VALUE_2,I.UTT_VALUE_2) AS 'UTT_VALUE_2/@OLD_VALUE'
,NULLIF(I.UTT_VALUE_2,D.UTT_VALUE_2) AS 'UTT_VALUE_2/@NEW_VALUE'

,NULLIF(D.UTT_VALUE_3,I.UTT_VALUE_3) AS 'UTT_VALUE_3/@OLD_VALUE'
,NULLIF(I.UTT_VALUE_3,D.UTT_VALUE_3) AS 'UTT_VALUE_3/@NEW_VALUE'

,NULLIF(D.UTT_VALUE_4,I.UTT_VALUE_4) AS 'UTT_VALUE_4/@OLD_VALUE'
,NULLIF(I.UTT_VALUE_4,D.UTT_VALUE_4) AS 'UTT_VALUE_4/@NEW_VALUE'

,NULLIF(D.UTT_VALUE_5,I.UTT_VALUE_5) AS 'UTT_VALUE_5/@OLD_VALUE'
,NULLIF(I.UTT_VALUE_5,D.UTT_VALUE_5) AS 'UTT_VALUE_5/@NEW_VALUE'
FROM deleted D
LEFT OUTER JOIN inserted I
ON D.UTT_ID = I.UTT_ID
WHERE DD.UTT_ID = D.UTT_ID
FOR XML PATH('COL_CHANGE'), TYPE
) AS UTT_XML
FROM deleted DD
END
ELSE IF (SELECT COUNT(*) FROM inserted) = 0 AND (SELECT COUNT(*) FROM deleted) > 0
BEGIN
-- DELETE
INSERT INTO dbo.UTT_AUDIT (UTT_ID,UTT_ACTION_XML)
SELECT
DD.UTT_ID
,(
SELECT
'DELETE' AS '@COL_ACTION'
,D.UTT_VALUE_1 AS 'UTT_VALUE_1/@OLD_VALUE'
,D.UTT_VALUE_2 AS 'UTT_VALUE_2/@OLD_VALUE'
,D.UTT_VALUE_3 AS 'UTT_VALUE_3/@OLD_VALUE'
,D.UTT_VALUE_4 AS 'UTT_VALUE_4/@OLD_VALUE'
,D.UTT_VALUE_5 AS 'UTT_VALUE_5/@OLD_VALUE'
FROM deleted D
WHERE DD.UTT_ID = D.UTT_ID
FOR XML PATH('COL_CHANGE'), TYPE
) AS UTT_XML
FROM deleted DD
END
GO

/* INSERT TEST DATA */
INSERT INTO dbo.UpdateTriggerTest
(
UTT_VALUE_1
,UTT_VALUE_2
,UTT_VALUE_3
,UTT_VALUE_4
,UTT_VALUE_5
)
VALUES (1,1,1,1,1)
,(2,2,2,2,2)
,(3,3,3,3,3)
,(4,4,4,4,4)
,(5,5,5,5,5)
,(6,6,6,6,6);

/* UPDATE ONE COLUMN */
UPDATE dbo.UpdateTriggerTest
SET UTT_VALUE_1 = UTT_VALUE_1 + 1
/* UPDATE TWO COLUMNS */
UPDATE dbo.UpdateTriggerTest
SET UTT_VALUE_1 = UTT_VALUE_1 + 1
,UTT_VALUE_2 = UTT_VALUE_2 + 2
/* UPDATE ALL COLUMNS */
UPDATE dbo.UpdateTriggerTest
SET UTT_VALUE_1 = UTT_VALUE_1 + 1
,UTT_VALUE_2 = UTT_VALUE_2 + 2
,UTT_VALUE_3 = UTT_VALUE_3 + 3
,UTT_VALUE_4 = UTT_VALUE_4 + 4
,UTT_VALUE_5 = UTT_VALUE_5 + 5
/* DELETE EVERY THIRD ROW */
DELETE FROM dbo.UpdateTriggerTest
WHERE UTT_ID % 3 = 2
/* DELETE THE REMAINING ROWS */
DELETE FROM dbo.UpdateTriggerTest
/* INSPECT THE AUDIT */
SELECT * FROM dbo.UTT_AUDIT;

/* CLEAN UP */
DROP TABLE dbo.UpdateTriggerTest;
DROP TABLE dbo.UTT_AUDIT;



Results
UTT_AUDIT_ID UTT_AUDIT_DATE              UTT_ID      UTT_ACTION_XML
------------ --------------------------- ----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1 2014-07-27 08:18:49.8765516 6 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="6" NEW_VALUE="7" /></COL_CHANGE>
2 2014-07-27 08:18:49.8765516 5 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="5" NEW_VALUE="6" /></COL_CHANGE>
3 2014-07-27 08:18:49.8765516 4 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="4" NEW_VALUE="5" /></COL_CHANGE>
4 2014-07-27 08:18:49.8765516 3 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="3" NEW_VALUE="4" /></COL_CHANGE>
5 2014-07-27 08:18:49.8765516 2 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="2" NEW_VALUE="3" /></COL_CHANGE>
6 2014-07-27 08:18:49.8765516 1 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="1" NEW_VALUE="2" /></COL_CHANGE>
7 2014-07-27 08:18:49.8825519 6 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="7" NEW_VALUE="8" /><UTT_VALUE_2 OLD_VALUE="6" NEW_VALUE="8" /></COL_CHANGE>
8 2014-07-27 08:18:49.8825519 5 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="6" NEW_VALUE="7" /><UTT_VALUE_2 OLD_VALUE="5" NEW_VALUE="7" /></COL_CHANGE>
9 2014-07-27 08:18:49.8825519 4 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="5" NEW_VALUE="6" /><UTT_VALUE_2 OLD_VALUE="4" NEW_VALUE="6" /></COL_CHANGE>
10 2014-07-27 08:18:49.8825519 3 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="4" NEW_VALUE="5" /><UTT_VALUE_2 OLD_VALUE="3" NEW_VALUE="5" /></COL_CHANGE>
11 2014-07-27 08:18:49.8825519 2 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="3" NEW_VALUE="4" /><UTT_VALUE_2 OLD_VALUE="2" NEW_VALUE="4" /></COL_CHANGE>
12 2014-07-27 08:18:49.8825519 1 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="2" NEW_VALUE="3" /><UTT_VALUE_2 OLD_VALUE="1" NEW_VALUE="3" /></COL_CHANGE>
13 2014-07-27 08:18:49.8865521 6 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="8" NEW_VALUE="9" /><UTT_VALUE_2 OLD_VALUE="8" NEW_VALUE="10" /><UTT_VALUE_3 OLD_VALUE="6" NEW_VALUE="9" /><UTT_VALUE_4 OLD_VALUE="6" NEW_VALUE="10" /><UTT_VALUE_5 OLD_VALUE="6" NEW_VALUE="11" /></COL_
14 2014-07-27 08:18:49.8865521 5 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="7" NEW_VALUE="8" /><UTT_VALUE_2 OLD_VALUE="7" NEW_VALUE="9" /><UTT_VALUE_3 OLD_VALUE="5" NEW_VALUE="8" /><UTT_VALUE_4 OLD_VALUE="5" NEW_VALUE="9" /><UTT_VALUE_5 OLD_VALUE="5" NEW_VALUE="10" /></COL_CH
15 2014-07-27 08:18:49.8865521 4 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="6" NEW_VALUE="7" /><UTT_VALUE_2 OLD_VALUE="6" NEW_VALUE="8" /><UTT_VALUE_3 OLD_VALUE="4" NEW_VALUE="7" /><UTT_VALUE_4 OLD_VALUE="4" NEW_VALUE="8" /><UTT_VALUE_5 OLD_VALUE="4" NEW_VALUE="9" /></COL_CHA
16 2014-07-27 08:18:49.8865521 3 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="5" NEW_VALUE="6" /><UTT_VALUE_2 OLD_VALUE="5" NEW_VALUE="7" /><UTT_VALUE_3 OLD_VALUE="3" NEW_VALUE="6" /><UTT_VALUE_4 OLD_VALUE="3" NEW_VALUE="7" /><UTT_VALUE_5 OLD_VALUE="3" NEW_VALUE="8" /></COL_CHA
17 2014-07-27 08:18:49.8865521 2 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="4" NEW_VALUE="5" /><UTT_VALUE_2 OLD_VALUE="4" NEW_VALUE="6" /><UTT_VALUE_3 OLD_VALUE="2" NEW_VALUE="5" /><UTT_VALUE_4 OLD_VALUE="2" NEW_VALUE="6" /><UTT_VALUE_5 OLD_VALUE="2" NEW_VALUE="7" /></COL_CHA
18 2014-07-27 08:18:49.8865521 1 <COL_CHANGE COL_ACTION="UPDATE"><UTT_VALUE_1 OLD_VALUE="3" NEW_VALUE="4" /><UTT_VALUE_2 OLD_VALUE="3" NEW_VALUE="5" /><UTT_VALUE_3 OLD_VALUE="1" NEW_VALUE="4" /><UTT_VALUE_4 OLD_VALUE="1" NEW_VALUE="5" /><UTT_VALUE_5 OLD_VALUE="1" NEW_VALUE="6" /></COL_CHA
19 2014-07-27 08:18:49.8905524 5 <COL_CHANGE COL_ACTION="DELETE"><UTT_VALUE_1 OLD_VALUE="8" /><UTT_VALUE_2 OLD_VALUE="9" /><UTT_VALUE_3 OLD_VALUE="8" /><UTT_VALUE_4 OLD_VALUE="9" /><UTT_VALUE_5 OLD_VALUE="10" /></COL_CHANGE>
20 2014-07-27 08:18:49.8905524 2 <COL_CHANGE COL_ACTION="DELETE"><UTT_VALUE_1 OLD_VALUE="5" /><UTT_VALUE_2 OLD_VALUE="6" /><UTT_VALUE_3 OLD_VALUE="5" /><UTT_VALUE_4 OLD_VALUE="6" /><UTT_VALUE_5 OLD_VALUE="7" /></COL_CHANGE>
21 2014-07-27 08:18:49.8925525 6 <COL_CHANGE COL_ACTION="DELETE"><UTT_VALUE_1 OLD_VALUE="9" /><UTT_VALUE_2 OLD_VALUE="10" /><UTT_VALUE_3 OLD_VALUE="9" /><UTT_VALUE_4 OLD_VALUE="10" /><UTT_VALUE_5 OLD_VALUE="11" /></COL_CHANGE>
22 2014-07-27 08:18:49.8925525 4 <COL_CHANGE COL_ACTION="DELETE"><UTT_VALUE_1 OLD_VALUE="7" /><UTT_VALUE_2 OLD_VALUE="8" /><UTT_VALUE_3 OLD_VALUE="7" /><UTT_VALUE_4 OLD_VALUE="8" /><UTT_VALUE_5 OLD_VALUE="9" /></COL_CHANGE>
23 2014-07-27 08:18:49.8925525 3 <COL_CHANGE COL_ACTION="DELETE"><UTT_VALUE_1 OLD_VALUE="6" /><UTT_VALUE_2 OLD_VALUE="7" /><UTT_VALUE_3 OLD_VALUE="6" /><UTT_VALUE_4 OLD_VALUE="7" /><UTT_VALUE_5 OLD_VALUE="8" /></COL_CHANGE>
24 2014-07-27 08:18:49.8925525 1 <COL_CHANGE COL_ACTION="DELETE"><UTT_VALUE_1 OLD_VALUE="4" /><UTT_VALUE_2 OLD_VALUE="5" /><UTT_VALUE_3 OLD_VALUE="4" /><UTT_VALUE_4 OLD_VALUE="5" /><UTT_VALUE_5 OLD_VALUE="6" /></COL_CHANGE>


For completeness, here is a query to get the details from the audit table
SELECT
A.UTT_AUDIT_ID
,A.UTT_AUDIT_DATE
,A.UTT_ID
,ROW_NUMBER() OVER (PARTITION BY A.UTT_ID ORDER BY A.UTT_AUDIT_DATE) AS COL_HIST_RID
,COL.CHANGE.value('@COL_ACTION','VARCHAR(6)') AS COL_ACTION

,COL.CHANGE.value('UTT_VALUE_1[1]/@OLD_VALUE','INT') AS UTT_VALUE_1_OLD
,COL.CHANGE.value('UTT_VALUE_1[1]/@NEW_VALUE','INT') AS UTT_VALUE_1_NEW

,COL.CHANGE.value('UTT_VALUE_2[1]/@OLD_VALUE','INT') AS UTT_VALUE_2_OLD
,COL.CHANGE.value('UTT_VALUE_2[1]/@NEW_VALUE','INT') AS UTT_VALUE_2_NEW

,COL.CHANGE.value('UTT_VALUE_3[1]/@OLD_VALUE','INT') AS UTT_VALUE_3_OLD
,COL.CHANGE.value('UTT_VALUE_3[1]/@NEW_VALUE','INT') AS UTT_VALUE_3_NEW

,COL.CHANGE.value('UTT_VALUE_4[1]/@OLD_VALUE','INT') AS UTT_VALUE_4_OLD
,COL.CHANGE.value('UTT_VALUE_4[1]/@NEW_VALUE','INT') AS UTT_VALUE_4_NEW

,COL.CHANGE.value('UTT_VALUE_5[1]/@OLD_VALUE','INT') AS UTT_VALUE_5_OLD
,COL.CHANGE.value('UTT_VALUE_5[1]/@NEW_VALUE','INT') AS UTT_VALUE_5_NEW

FROM dbo.UTT_AUDIT A
OUTER APPLY A.UTT_ACTION_XML.nodes('COL_CHANGE') AS COL(CHANGE)



Results
UTT_AUDIT_ID UTT_AUDIT_DATE              UTT_ID      COL_HIST_RID         COL_ACTION UTT_VALUE_1_OLD UTT_VALUE_1_NEW UTT_VALUE_2_OLD UTT_VALUE_2_NEW UTT_VALUE_3_OLD UTT_VALUE_3_NEW UTT_VALUE_4_OLD UTT_VALUE_4_NEW UTT_VALUE_5_OLD UTT_VALUE_5_NEW
------------ --------------------------- ----------- -------------------- ---------- --------------- --------------- --------------- --------------- --------------- --------------- --------------- --------------- --------------- ---------------
6 2014-07-27 08:38:25.2857811 1 1 UPDATE 1 2 NULL NULL NULL NULL NULL NULL NULL NULL
12 2014-07-27 08:38:25.2907814 1 2 UPDATE 2 3 1 3 NULL NULL NULL NULL NULL NULL
18 2014-07-27 08:38:25.2947816 1 3 UPDATE 3 4 3 5 1 4 1 5 1 6
24 2014-07-27 08:38:25.3017820 1 4 DELETE 4 NULL 5 NULL 4 NULL 5 NULL 6 NULL
5 2014-07-27 08:38:25.2857811 2 1 UPDATE 2 3 NULL NULL NULL NULL NULL NULL NULL NULL
11 2014-07-27 08:38:25.2907814 2 2 UPDATE 3 4 2 4 NULL NULL NULL NULL NULL NULL
17 2014-07-27 08:38:25.2947816 2 3 UPDATE 4 5 4 6 2 5 2 6 2 7
20 2014-07-27 08:38:25.2987819 2 4 DELETE 5 NULL 6 NULL 5 NULL 6 NULL 7 NULL
4 2014-07-27 08:38:25.2857811 3 1 UPDATE 3 4 NULL NULL NULL NULL NULL NULL NULL NULL
10 2014-07-27 08:38:25.2907814 3 2 UPDATE 4 5 3 5 NULL NULL NULL NULL NULL NULL
16 2014-07-27 08:38:25.2947816 3 3 UPDATE 5 6 5 7 3 6 3 7 3 8
23 2014-07-27 08:38:25.3017820 3 4 DELETE 6 NULL 7 NULL 6 NULL 7 NULL 8 NULL
3 2014-07-27 08:38:25.2857811 4 1 UPDATE 4 5 NULL NULL NULL NULL NULL NULL NULL NULL
9 2014-07-27 08:38:25.2907814 4 2 UPDATE 5 6 4 6 NULL NULL NULL NULL NULL NULL
15 2014-07-27 08:38:25.2947816 4 3 UPDATE 6 7 6 8 4 7 4 8 4 9
22 2014-07-27 08:38:25.3017820 4 4 DELETE 7 NULL 8 NULL 7 NULL 8 NULL 9 NULL
2 2014-07-27 08:38:25.2857811 5 1 UPDATE 5 6 NULL NULL NULL NULL NULL NULL NULL NULL
8 2014-07-27 08:38:25.2907814 5 2 UPDATE 6 7 5 7 NULL NULL NULL NULL NULL NULL
14 2014-07-27 08:38:25.2947816 5 3 UPDATE 7 8 7 9 5 8 5 9 5 10
19 2014-07-27 08:38:25.2987819 5 4 DELETE 8 NULL 9 NULL 8 NULL 9 NULL 10 NULL
1 2014-07-27 08:38:25.2857811 6 1 UPDATE 6 7 NULL NULL NULL NULL NULL NULL NULL NULL
7 2014-07-27 08:38:25.2907814 6 2 UPDATE 7 8 6 8 NULL NULL NULL NULL NULL NULL
13 2014-07-27 08:38:25.2947816 6 3 UPDATE 8 9 8 10 6 9 6 10 6 11
21 2014-07-27 08:38:25.3017820 6 4 DELETE 9 NULL 10 NULL 9 NULL 10 NULL 11 NULL


Edit(added xml query)
diallonina
diallonina
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Oh Eirikur Eiriksson, i am impressed by your script w00t

In your sample, you are listing the colums of the table to audit and if this table changed (column added or removed, the script must be modified to fit to the new structure. Am i right ?

That's why i wanted to use sysColumns, so the coumns will be bound 'dynamically' and no more need to change the triggers.

It's really a good start. Thank you ;-)
Eirikur Eiriksson
Eirikur Eiriksson
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diallonina (7/27/2014)
Oh Eirikur Eiriksson, i am impressed by your script w00t

In your sample, you are listing the colums of the table to audit and if this table changed (column added or removed, the script must be modified to fit to the new structure. Am i right ?

That's why i wanted to use sysColumns, so the coumns will be bound 'dynamically' and no more need to change the triggers.

It's really a good start. Thank you ;-)



You are welcome.
On the "generic audit trigger", I normally prefer to write a create trigger script that is generic rather than writing a generic audit trigger.
Cool

Michael Coles suggests in his book Pro SQL Server 2008 XML to use FOR XML AUTO to create a generic trigger, not a bad solution but it doesn't filter out the unchanged values.

This topic does pop up once in a while, here is another similar thread: http://www.sqlservercentral.com/Forums/FindPost536737.aspx
Go


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