DevForce Community Forum : checkpointing with multiple forms http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce Classic : checkpointing with multiple forms Mon, 20 May 2013 20:48:55 -700 Thu, 09 Oct 2008 16:05:44 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=955 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ checkpointing with multiple forms : But I already did that in Form... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3485#3485 Author: yongbum75
Subject: 955
Posted: 09-Oct-2008 at 4:05pm

But I already did that in FormB:

FormAPersMgr.ImportEntities(mModifiedEntityList, MergeStrategy.OverwriteChanges)
FormAPersMgr.ImportEntities(mAddedEntityList, MergeStrategy.OverwriteChanges)

When I do this, I can see that FormA's PM has all the changes I made in FormB.

But, in FormA, the controls bound to a bindingsource whose datasource is an entitylist populated by FormAPersMgr, aren't automatically refreshed.



]]> Thu, 09 Oct 2008 16:05:44 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3485#3485 checkpointing with multiple forms : or you can use ImportEntities.... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3483#3483 Author: davidklitzke
Subject: 955
Posted: 09-Oct-2008 at 10:24am

or you can use ImportEntities.]]> Thu, 09 Oct 2008 10:24:10 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3483#3483 checkpointing with multiple forms : So, is it just a matter of calling... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3481#3481 Author: yongbum75
Subject: 955
Posted: 08-Oct-2008 at 11:17am

So, is it just a matter of calling the GetEntities() method from FormA's PM?

mCustomers.ReplaceRange(FormAPersMgr.GetEntities(Of Customer)())
]]> Wed, 08 Oct 2008 11:17:14 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3481#3481 checkpointing with multiple forms : You are correct. It is not automatic.... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3480#3480 Author: davidklitzke
Subject: 955
Posted: 08-Oct-2008 at 10:55am

You are correct.  It is not automatic.  Furthermore, not all users want it to be automatic.  Many users do not want their forms being modified by other PM's.  As a developer, you get to decide how you want your separate PM's tp interact with each other.]]> Wed, 08 Oct 2008 10:55:38 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3480#3480 checkpointing with multiple forms : I think I found out why.I actually... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3477#3477 Author: yongbum75
Subject: 955
Posted: 08-Oct-2008 at 9:00am

I think I found out why.

I actually misstated by saying that FormA's PM does not have the changes I made in FormB.  In fact, it does have all the changes I made in FormB.  However, the controls in FormA that are bound to the bindingsource object populated by FormA's PM do not automatically reflect changed data.  For instance, I added a new customer record in FormB, above statements are executed resulting in FormA's PM now having the newly added customer record.  I check the grid control on FormA but do not see the newly added customer record.  Do I need to do something to refresh data in FormA?  When I was using a shared PM before, this did not used to be an issue.  In other words, data was auto refreshed.
]]> Wed, 08 Oct 2008 09:00:18 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3477#3477 checkpointing with multiple forms : I actually saw this post but wasn't... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3474#3474 Author: yongbum75
Subject: 955
Posted: 07-Oct-2008 at 8:05pm

I actually saw this post but wasn't quite sure how to use the pm.importentities() method to "refresh" anything.

I have two forms, let's call it FormA and FormB.  Each form is using its own instance of the PM.

In FormA, I have a grid control that displays the customer listing.

In FormB, I followed the steps suggested in the post (http://www.ideablade.com/forum/forum_posts.asp?TID=234) in order to sync up data between the two PMs.  My "import entities" code looks something like below:

FormAPersMgr.ImportEntities(mModifiedEntityList, MergeStrategy.OverwriteChanges)
FormAPersMgr.ImportEntities(mAddedEntityList, MergeStrategy.OverwriteChanges)

mModifiedEntityList contains modified entities while mAddedEntityList contains added entities that I saved in the PM's Saving event.

Now, after I execute the above two statements, I would expect FormA's PM to have the changes I made in FormB.  However, it doesn't.

What am I doing wrong?

]]> Tue, 07 Oct 2008 20:05:06 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3474#3474 checkpointing with multiple forms : Read this post: http://www.... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3470#3470 Author: davidklitzke
Subject: 955
Posted: 07-Oct-2008 at 8:38am

Read this post:
 
http://www.ideablade.com/forum/forum_posts.asp?TID=234
 
]]> Tue, 07 Oct 2008 08:38:19 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3470#3470 checkpointing with multiple forms : OK, I can use multiple PMs. How... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3464#3464 Author: yongbum75
Subject: 955
Posted: 04-Oct-2008 at 9:25pm

OK, I can use multiple PMs.  How do I merge changes saved by different PMs?  Is there a quick and efficient way to do it?
]]> Sat, 04 Oct 2008 21:25:10 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3464#3464 checkpointing with multiple forms : If you want rollback-by-form with... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3458#3458 Author: GregD
Subject: 955
Posted: 02-Oct-2008 at 2:55pm

If you want rollback-by-form with the ability to have multiple forms open with unsaved changes, then multiple PMs is the only way to get it.
 
Greg Dunn
 
 
 
 
]]> Thu, 02 Oct 2008 14:55:24 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3458#3458 checkpointing with multiple forms : Hi, I am using a single instance... http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3450#3450 Author: yongbum75
Subject: 955
Posted: 29-Sep-2008 at 8:43pm

Hi, I am using a single instance of PersistenceManager throughout my MDI Windows app.

1. User opens Customer List form.
2. BeginCheckPoint() is called in the constructor.
3. User makes changes to a customer.
4. Without closing Customer form, user then opens Order List form.
5. BeginCheckPoint() is called in the constructor.
6. User makes changes to an order.
7. User decides to go back to Customer List form then cancels changes and closes the form at which point RollbackCheckPoint() is called.

It looks like the RollbackCheckPoint() call rolls back changes made to the order at step 6 not the customer.

I think I understand why this happens but I wonder if there is any way to achieve what I am trying to achieve that is to roll back changes made to the customer at step 3.  Is there any way to do that without using more than one instance of PersistenceManager?

Thanks for your help in advance.
]]> Mon, 29 Sep 2008 20:43:09 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=955&PID=3450#3450