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Keep data changes in check with this new trigger type Kalen Delaney Since its first release, SQL Server has had a mechanism to provide an automated response whenever a user or an application changes data.
This mechanism is a trigger, which is a special kind of stored procedure. In this issue, I show you some details about creating and working with INSTEAD OF triggers, which give you the added benefit of being able to examine proposed changes to your data before those changes take place.
Other database products have mechanisms that define a set of actions for the database system to perform before it carries out the specified data modification. What Was Supposed to Happen?
With all triggers, the Inserted and Deleted tables change their structure to reflect the columns and data types of the table the trigger is attached to. For example, if you have a trigger on the Titles table in the Pubs database, the Inserted and Deleted tables will have all the same columns that the Titles table has, with the same names and data types.
Suppose you want to make sure that when someone updates any prices in the Titles table in the Pubs database, the change is no more than 10 percent of the original price.
You need to look at both the old price value and the new value to see whether the change is more than 10 percent. You can get the old value from the Deleted table and the new value from Inserted. If your application includes both kinds of triggers, you might use the word AFTER for consistency and to clearly distinguish the two kinds of triggers.
Because the AFTER trigger fires after a client updates the Titles table, the trigger must force a rollback if it encounters an error. This trigger fires before the changes happen, but the rows that would have been affected are available in the Inserted and Deleted tables.
The basic comparison for price changes greater than 10 percent is the same in this trigger as in the AFTER trigger. If you want to carry out the intended update, you could delete all the rows that match the rows in the Deleted table and insert all the rows from the Inserted table.
But in this case, the Titles table has foreign-key references from other tables, so you can't delete rows from Titles. My simple solution, which Listing 2 shows, works on the premise that the price was updated, so the trigger can update the price values in the Titles table based on the Inserted table's contents.
Both these triggers prevent updates to the primary key of the Titles table, and both triggers prevent updates to the price column that would change the price by more than 10 percent. Of course, you probably wouldn't have both these triggers on the Titles table; you would choose to have one or the other because you need to validate the price change only once.
Which Trigger Should You Choose? The AFTER trigger might appear less efficient because it sometimes needs to undo work that has already been done.
SQL Server builds worktables to hold the inserted and deleted records as if the modification had occurred. Then, if the modification takes place, SQL Server must make the changes and log them, adding to the work of creating the worktables.
If many of the table's columns could be included in the SET clause in the UPDATE statement, the trigger would be cumbersome to write, and I would have to check each column to see whether it had a different value in the Deleted or Inserted tables.
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