Trigger Order of Execution in VS .NET

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Trigger Order of Execution
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SQL Server 7.0 introduced the idea that more than one trigger could be created per modification statement. However, the execution order of such triggers could not be controlled. In SQL Server 2000, it is possible to define which After trigger to execute first and which to execute last against a table. For example, the following statement will set trInventory_I to be the first trigger to be executed in the case of an Insert modification statement:
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Exec sp_settriggerorder @triggername = 'trInventory_I', @order = 'first', @stmttype = 'INSERT'
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The @order parameter must have one of these values: 'first', 'last', or 'none'. The value 'none' is used to reset the order of the execution of the trigger after it has been specified. The @smttype parameter must have one of these values: 'INSERT', 'UPDATE', or 'DELETE'. Since only one Instead-of trigger can be associated with a table, and since it is executed before any other trigger (or constraint), it is not possible to set its order. Alter Trigger statements reset the order of the trigger. After altering the trigger, you must execute the sp_SetTriggerOrder statement to set it again.
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Managing Triggers
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You can manage triggers using GUI tools such as Enterprise Manager, Query Analyzer Object Browser, or Visual Database Tools. Other methods include using Transact-SQL statements within tools like Query Analyzer.
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Managing Triggers in Enterprise Manager
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You can access triggers from Enterprise Manager by right-clicking the table with which the trigger is associated and selecting All Tasks | Manage Triggers from the pop-up menus.
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SQL Server displays a modal form for editing trigger properties (see Figure 8-10). This editor is very similar to the editor you use to edit stored procedures. SQL Server initially fills the form with a template for creating a new trigger. If you want to access a trigger that is already defined for the table, use the Name list box to select it. Once you have created or modified the trigger, you can click the Check Syntax button to verify it, then click OK or Apply to attach it to the table. You can delete triggers by selecting the trigger from the drop-down list and clicking the Delete button.
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Managing Triggers in the Query Analyzer Object Browser
You can access triggers from the Object Browser when you open the tree node under the table with which the trigger is associated. When you open the Triggers node, Query Analyzer displays a list of triggers. You can right-click any trigger and the program will offer you the usual options (for instance, Edit and Delete).
Managing Triggers Using Transact-SQL Statements
SQL Server has a rich pallet of system stored procedures for managing triggers from Transact-SQL.
Figure 8-10
Editing triggers
SQL Server 2000 Stored Procedure & XML Programming
Listing Triggers To list triggers associated with a table, use the system stored procedure sp_helptrigger:
sp_helptrigger 'Order'
The server returns the list of triggers associated with the specified table and displays the type of trigger found in the isupdate, isdelete, isinsert, isafter, and isinteadof columns:
trigger_name ----------------trOrderStatus_U trOrderStatus_U_1 owner ----dbo dbo isupdate -------1 1 isdelete -------0 0 isinsert -------0 0 isafter ------1 1 isinteadof ---------0 0
(2 row(s) affected)
Viewing Triggers You can obtain the code for a trigger using the system stored procedure sp_helptext:
sp_helptext 'trOrderStatus_U'
The server returns the code for the specified trigger:
Text --------------------------------------------------------------------CREATE Trigger trOrderStatus_U On dbo.[Order] After Update -- For Update As If Update (OrderStatusId) Begin Insert into ActivityLog( Activity, LogDate, UserName, Note) Select 'Order.OrderStatusId', GetDate(), USER_NAME(), 'Value changed from ' + Cast( d.OrderStatusId as varchar) + ' to ' + Cast( i.OrderStatusId as varchar)
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From deleted d inner join inserted i On d.OrderId = i.OrderId End
Deleting Triggers A trigger can be deleted, as can all other database objects, using the appropriate Drop statement:
Drop Trigger 'Orders_Trigger1'
Modifying Triggers Earlier in this chapter, you saw details of the syntax of a Transact-SQL statement for creating triggers. Triggers can be modified using the Alter Trigger statement. Since the features of the Alter Trigger and Create Trigger statements are identical, we will not explore the syntax a second time. It is much better to use the Alter Trigger statement to modify a trigger than to drop and then re-create the trigger. During the period between dropping and creating a trigger, a user might make a change to the table, the consequence of which is that the rules that are usually enforced by the trigger will not be enforced.
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