DDL Events

Dave Mason looks at DDL triggers:

DDL triggers and the events they handle are run within the same transaction, which can be rolled back. This is a powerful and convenient feature. It gives you the ability to programmatically “undo” undesirable events. Let’s look at a variation of the previous DROP_TABLE trigger we created. This script will create a temporary logging table, drop the previous trigger, and create it again. This time, the trigger will roll back the transaction, preventing the table from being dropped. Then it inserts a message to the log table.

There are a few gotchas here, to be sure, but DDL triggers are powerful tools.

Related Posts

Triggers and Multi-Record Changes

Brent Ozar points out a common problem with trigger design: When you declare variables and set them using one row from the INSERTED or DELETED virtual table, you have no idea which row you’re going to get. Even worse, sometimes this trigger will update one row, and sometimes it won’t – because it might happen to […]

Read More

Enabling and Disabling Triggers

Kenneth Fisher shows how you can enable and disable triggers in SQL Server: I tend to feel that a lot of people who use triggers don’t really understand them. That said, every now and again you have to deal with them. And in particular (for this post) you might need to disable and then re-enable […]

Read More

Categories

July 2016
MTWTFSS
« Jun Aug »
 123
45678910
11121314151617
18192021222324
25262728293031