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SQL Server 2000 Stored Procedure Programming
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SQL Server initially fills the form with a template for creating a new trigger. If you want to access the trigger that is already attached to the table, use the Name list box to select it. Once you have written or changed the trigger, you can use the Check Syntax button to verify it, then select OK or Apply to attach it to the table. After you have attached the trigger to the table, you can delete it using the Delete button on the form.
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Managing Triggers in Query Analyzer Object Browser
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You can access triggers from Object Browser when you open the tree node under the table with which the trigger is associated. Open the Triggers node, and Query Analyzer will display a list of triggers. You can right-click any trigger and the program will offer you the usual options, for instance, Edit and Delete.
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Managing Triggers Using Transact-SQL Statements
SQL Server has a rich pallet of system stored procedures for managing triggers from Transact-SQL. 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, and isinsert columns.
trigger_name trOrderStatus_U trOrderStatus_U_1 (2 row(s) affected) trigger_owner dbo dbo isupdate 1 1 isdelete isinsert 0 0 0 0 -------------------- -------------- ----------- ----------- --------
Viewing Triggers You can obtain the code for a trigger using the system stored procedure sp_helptext:
sp_helptext 'trOrderStatus_U'
SQL Server 2000 Stored Procedure Programming
The server returns the code for the specified trigger:
Text --------------------------------------------------------------------CREATE Trigger trOrderStatus_U On dbo.[Order] After 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) From deleted d inner join inserted i On d.OrderId = i.OrderId End -- For Update
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 recreate the trigger. During the period between dropping and creating a trigger, a user might make a change
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to the table and the rules that are usually enforced by the trigger will not be enforced.
NOTE: Keep in mind that the order of execution is lost when the trigger is altered you must reset it again using sp_setTriggerorder.
Renaming Triggers Triggers are often renamed using Transact-SQL statements designed for the creation and modification of triggers. As with all other database objects, a trigger can be forced to change its name using the following system stored procedure:
Exec sp_rename 'Orders_Trigger1', 'trOrders_IU'
The first parameter is the current name of the database object, and the second parameter is the new name of the object. Disabling Triggers It is possible to temporarily disable and enable triggers without dropping them:
Alter Table Order Disable Trigger trOrders_IU
After the execution of this statement, the specified trigger will not fire, but it will still be associated with the table. This technique is often used by database administrators to set up initial data in the table without initiating the business logic encapsulated in the trigger.
Trigger Design Recommendations
Since triggers are relatively complex database objects, it is easy to make design, performance, or maintainability problems inside your database. Therefore, we will spend some time pointing out a proper way to use them.
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