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The Update() function might not perform exactly as you expect. In fact, it returns True for columns that were referenced during the Transact-SQL statement, rather than for columns that were actually changed. For example, if you issue the following update statement, SQL Server references the Make column of all records and the trigger recalculates the SOUNDEX code in all records:

This behavior might cause some problems for you if you forget about it. However, in some cases, you can use it to your advantage. For example, to speed up the upload of information to the table, you can temporarily

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disable triggers (see the Disabling Triggers section later in this chapter). Later, when you want to execute the triggers (for example, to verify their validity and/or perform additional activities), you can use this feature to initiate triggers for records that are present in the table.

TIP: Too often, developers forget that the presence of a default constraint in a column causes the Update() function to return True for that column during the execution of the Insert statement. This will occur even if the Insert statement did not reference the column itself.

Figure 3-7

The Columns_Updated() function operates with a bitmap that is related to the positions of columns. You can investigate its contents if you use an integer bitmask. To test whether the third column in a table was updated, you can use:

if Columns_Updated() & 3 = 3 print 'Column 3 was updated!'

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The ampersand (&) is a binary and operator and you can test the value of the flag using it. Naturally, hard-coding the order of columns does not make much sense. The real value of this function is as a means of looping through all the columns that were updated and performing specified actions. The following trigger loops through columns and displays which ones were updated:

Create Trigger trEquipment_IU_2 -- list all columns that were changed On dbo.Equipment after Insert, Update As Set Nocount Off declare @intCountColumn int, @intColumn int -- count columns in the table Select @intCountColumn = Count(Ordinal_position) -- For Insert, Update

In the previous context, a user is considered idle from the database perspective The human end user might be quite active, filling in the data entry screen, getting information from customers, and so forth But those activities do not require any server interaction until a command is actually sent So from the SQL Server engine perspective, the connection is idle When you think of an active user versus an idle user, be sure to consider the user in the context of the back-end database server In practically all types of applications that have many end users, at any given time the number of users who have an active request with the database is relatively small A system with 1,000 active connections might reasonably be configured with 150 or so worker threads.

From Information_Schema.Columns Where Table_Name = 'Equipment' Select Columns_Updated() "COLUMNS UPDATED" Select @intColumn = 1 -- loop through columns while @intColumn <= @intCountColumn begin if Columns_Updated() & @intColumn = @intColumn Print 'Column (' + Cast(@intColumn as varchar) + ') ' + Col_Name('Equipment', @intColumn) + ' has been changed!' End

Use the following statement to test this trigger:

You can also use sp_helptext to view the code of other database objects such as triggers, views, defaults, and rules.

Insert Equipment(Make, Model, EqTypeID) Values('Acme', '9000', 1)

Let s investigate a trigger designed to record the name of the user that changed the status of an order in the ActivityLog table, along with some additional information:

Create Trigger trOrderStatus_U_1 On dbo.[Order] After Update As declare @intOldOrderStatusId int, @intNewOrderStatusId int If Update (OrderStatusId) Begin select @intOldOrderStatusId = OrderStatusId from deleted select @intNewOrderStatusId = OrderStatusId from inserted -- For Update

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Insert into ActivityLog( Activity, LogDate, UserName, Note) values ( 'Order.OrderStatusId', GetDate(), User_Name(), 'Value changed from ' + Cast( @intOldOrderStatusId as varchar) + ' to ' + Cast((@intNewOrderStatusId) as varchar) ) End

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