December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
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Triggers and Transaction Nesting
To demonstrate the relationship between a trigger and the transaction nesting level, you can use the following SQL code to create a trigger on the employee table:
use AdventureWorks2012goCREATE TRIGGER tD_auditlog ON employeeFOR DELETEAS DECLARE @msg VARCHAR(255) SELECT @msg = 'Trancount in trigger = ' + CONVERT(VARCHAR(2), @@trancount) PRINT @msg RETURNgo
The purpose of this trigger is simply to show the state of the @@trancount within the trigger as the deletion is taking place.
If you now execute code for implied and explicit transactions, you can see the values of @@trancount and behavior of the batch. First, here’s the implied transaction:
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.