SQL Server Trigger Columns Updated

by ebarcza 11/10/2011 7:00:00 AM
This handy dandy little function will return a table with all the columns that were updated in a trigger.
CREATE FUNCTION [dbo].[udf_GetUpdatedColumns]( 
@Tablename VARCHAR(100), @ColumnsUpdated VARBINARY(255) ) 
RETURNS TABLE 
AS 
RETURN 
    SELECT 
        COLUMN_NAME 
    FROM INFORMATION_SCHEMA.COLUMNS Field 
    WHERE 
        TABLE_NAME = @Tablename 
        AND sys.fn_IsBitSetInBitmask( @ColumnsUpdated,
            COLUMNPROPERTY(OBJECT_ID(TABLE_SCHEMA + '.' + TABLE_NAME), 
            COLUMN_NAME, 'ColumnID')) <> 0

Usage is as follows:

ALTER trigger [dbo].[trg_InfoUpdate] on [dbo].[Info] for  update
as
print 'TRIGGAH'
DECLARE @ColumnsUpdated VARBINARY(1000) = COLUMNS_UPDATED()
SELECT * FROM dbo.udfDecodeBitmask('BankingInfo', @ColumnsUpdated)

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SQL SERVER

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