Creating a Trigger on Update that makes a web request

We are using MSSQL 2008 on a Windows 2008 environment, and I was wondering if someone could help me learn how to make a trigger that would check on update if a particular field met a certain criteria, and if so, send out a predefined request.

Long story short, we have car GPS data being sent to our DB. One of the values stored during a row update is the car’s speed (in a field called ‘velocity’) In the event it goes over a set threshold (let’s say 80), we would like it to make a request to a web page in the format:[[I]car_id_from_record[/I]]&velocity=[velocity_from_record]

Can someone help point me in the right direction?

Any thoughts?

I’ve been looking at other solutions like having the application server check the values in the DB on a set interval, but I think that kind of “pull” solution is much less effective than if the DB “pushed” the event when it saw a record get updated/inserted that triggered that event.