How To Create Generic SQL Server Stored Procedure To Perform Inserts Into Audit Table Based on Inserted and Deleted In Trigger

Question

I have implemented an audit trail framework based on the information provided by the first answer to the following post:

SQL Server history table - populate through

Answer 1

Ran into a similar problem... figured it out this way... may not be the most elegant solution but works for the compliance guys... So here goes...

Based on the solution given here

The xml is extracted with FOR XML from the trigger that updated the table... The "OldValues" come from the DELETED table and the "NewValues" from the INSERTED table... so the final xml looks like this...

            DECLARE @x XML= '
              
                OldValues
                5
                TEST_TIE
                
              
              
                OldValues
                4
                RP_TIE
                
              
              
                OldValues
                3
                ERR_TIE
                
              
                NewValues
                5
                TEST_TIE
                A
              
              
                NewValues
                4
                RP_TIE
                A
              
              
                NewValues
                3
                ERR_TIE
                A
              
            '

            declare @timestamp datetime2= SYSDATETIME()

            select 
                     ID = identity(int,1,1), 
                     T.N.value('local-name(.)', 'nvarchar(100)') as NodeName,
                     T.N.value('../ID[1]','nvarchar(100)') AS table_ID,
                     T.N.value('.', 'nvarchar(100)') as OldValue
            INTO #old
            from @x.nodes('//UpdatedColumns/*') as T(N)
            WHERE T.N.value('../trType[1]', 'nvarchar(100)') ='OldValues'


            select 
                     ID = identity(int,1,1),
                     T.N.value('local-name(.)', 'nvarchar(100)') as NodeName,
                     T.N.value('../ID[1]','nvarchar(100)') AS Table_ID,
                     T.N.value('.', 'nvarchar(100)') as NewValue
            into #new
            from @x.nodes('//UpdatedColumns/*') as T(N)
            WHERE T.N.value('../trType[1]', 'nvarchar(100)') ='NewValues'



            SELECT n.table_ID, n.NodeName, o.OldValue, n.NewValue,@timestamp as transation_time FROM #new n
            left outer JOIN #old o ON n.NodeName = o.NodeName AND n.ID = o.ID 
            WHERE isnull(o.[OldValue],'') <> isnull(n.[newValue],'') AND n.NodeName <> 'trType'



            DROP TABLE #new,#old 
            GO