What is the most portable way to check whether a trigger exists in SQL Server?

Question

I\'m looking for the most portable method to check for existence of a trigger in MS SQL Server. It needs to work on at least SQL Server 2000, 2005 and prefe

Answer 1

This works on SQL Server 2000 and above

IF OBJECTPROPERTY(OBJECT_ID('{your_trigger}'), 'IsTrigger') = 1
BEGIN
    ...
END

Note that the naive converse doesn't work reliably:

-- This doesn't work for checking for absense
IF OBJECTPROPERTY(OBJECT_ID('{your_trigger}'), 'IsTrigger') <> 1
BEGIN
    ...
END

...because if the object doesn't exist at all, OBJECTPROPERTY returns NULL, and NULL is (of course) not <> 1 (or anything else).

On SQL Server 2005 or later, you could use COALESCE to deal with that, but if you need to support SQL Server 2000, you'll have to structure your statement to deal with the three possible return values: NULL (the object doesn't exist at all), 0 (it exists but is not a trigger), or 1 (it's a trigger).