DevForce Community Forum : SaveChanges exception and Checkpoints http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce Classic : SaveChanges exception and Checkpoints Sat, 11 Apr 2026 02:40:05 -700 Thu, 03 Apr 2014 10:32:18 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=147 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ SaveChanges exception and Checkpoints : This is still the case in DevForce... http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=17441#17441 Author: IdeaBlade
Subject: 147
Posted: 03-Apr-2014 at 10:32am

This is still the case in DevForce Classic since you can’t restore a checkpoint after a Save, this is not what checkpoints were designed for.
The previous answer describes what you need to do to revert changes if you need to.

]]> Thu, 03 Apr 2014 10:32:18 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=17441#17441 SaveChanges exception and Checkpoints : >>It is under the assumption... http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=17407#17407 Author: agrogers
Subject: 147
Posted: 13-Mar-2014 at 8:37am

>>  It is under the assumption that all data currently inside the Pm are valid and ready to be saved � thus all Checkpoints and their data are no longer needed

Is this still the case in the Classic version of IdeaBlade?

The assumption doesn't seem to make sense to me so maybe I am missing something. I want to use a checkpoint so that i can easily roll back changes that I cannot persist to the server. However I dont know they cannot be persisted until i try to persist them with the SaveChanges call using the IsTransactional option.

So the persist fails but no harm is done as it fails in its entirety since it is transactional. However now I need to undo the changes made to the entity objects in the cache. My Checkpoint is perfect for this... except if my checkpoint is cleared *before* the SaveChanges. 

How do we get rid of the changes to records in the cache if a transactional persist fails?

thanks
]]> Thu, 13 Mar 2014 08:37:24 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=17407#17407 SaveChanges exception and Checkpoints : PersistenceManager will clear... http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=316#316 Author: IdeaBlade
Subject: 147
Posted: 12-Jul-2007 at 11:35am

PersistenceManager will clear all Checkpoints before saving any data.  It is under the assumption that all data currently inside the Pm are valid and ready to be saved – thus all Checkpoints and their data are no longer needed.  So there is no way to rollback any Checkpoint after a SaveChanges call.

Even SaveChanges throws an exception because a save failure, your Pm still contains the same/correct data that you intended to save – with no Checkpoint.

You may start new Checkpoints afterward.  I would think you may want to do a SaveEntitySet call to save the current Pm data to a file for later recovery (in case the data-source connection is restored).

If you absolutely must revert the changes before the checkpoints and a SaveChanges call, you can use SaveEntitySet to save Pm data into a file before any checkpoint.  When appropriate, you can revert the Pm data with a RestoreEntitySet call.

]]> Thu, 12 Jul 2007 11:35:03 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=316#316 SaveChanges exception and Checkpoints : 1. I begin a checkpoint 2. Make... http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=315#315 Author: Customer
Subject: 147
Posted: 12-Jul-2007 at 11:34am

1. I begin a checkpoint

2. Make changes to an object

3. Call SaveChanges

4. Save Changes throws an exception so the database did not get updated

After the exception I cannot rollback the checkpoint. 

How should I revert to the changes before the checkpoint in this case?

]]> Thu, 12 Jul 2007 11:34:07 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=147&PID=315#315