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Notification from SQL Server to my App

Posted on 2013-01-14
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Last Modified: 2013-01-18
Hello,

I've been using timers to check some object status from a database (SQL Server 2008 Express). It was all ok, until the data retrieved was big enought that the timers routine to check got inefficient.

I read something about SQLDependency, which triggers an event when a table is changed and notifies my app. That seems to be great, since i have to treat the data only when I really have to...

The problem is I'm kind of a rookie in database structuring and the examples I found were rather complex for me...

Could someone post here a very simple example that i can understand how to use this? Or if there is a better way that would be welcome too.

Thanks in advance.
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Question by:toddinho
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6 Comments
 
LVL 30

Expert Comment

by:anarki_jimbel
ID: 38776521
There are some examples alreadyon Internet:

http://msdn.microsoft.com/en-us/library/t9x04ed2(v=vs.80).aspx
and related
http://msdn.microsoft.com/en-us/library/9dz445ks(v=vs.80).aspx

The code is pretty simple.
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LVL 70

Accepted Solution

by:
Éric Moreau earned 2000 total points
ID: 38776625
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Author Comment

by:toddinho
ID: 38793735
Wow, thats GREAT!!! Thanks for the example emoreau!!

PS: Sorry for the time i took to accept the solution, I couldn't download the .zip from the office, i had to take it home and email it to myself.
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Author Comment

by:toddinho
ID: 38793738
Just one last question: If i want to drop a database that has these services it says it's in use. How can i delete them so I can drop it?
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LVL 70

Expert Comment

by:Éric Moreau
ID: 38793749
I never tried. but you should be able to use SP_Kill to kill any session (use SP_who2 to find out the sessions).
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Author Comment

by:toddinho
ID: 38794016
I figured this out... It wasn't the Service Broker that was using the database, i had to set it offline.

alter database [DemoNotifications2]
set OFFLINE
with rollback immediate
go
drop database [DemoNotifications2]
go

Thanks anyway :)
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