If two users modify data at the same time ( e.g. user 1 Reads data into a BO, Changes It, Users 2 reads same Data into a BO, User 1 then saves the BO, and then User 2 Attempts to Save the same data), a message comes up:

Data Collision... Another user made changes to the same record..choose the changes to accept  (MyValue or Server Value)

Now, this is fine most of the time (say for Master File Changes)

However, If say an Invocie is being modified in this way, I NEVER want the second user to have their changes accepted. In this case, I would prefer if an error was raised and a notification to this effect ended up in the BrokenRules Collection

In my BusinessObject, I would like to do something like:

if (DataCollision = true) {this.AddBrokenRule("XXX", "Another User has just amended the transaction ");}

and I do not want the user to have the option to choose what is to be done.

 

If you let it try resaving, after adding the broken rule, won't it work the way you want?




Sorry, I am a bit confused on this one. Would you like to produce a small simple sample application of what you want to accomplish? Then it could be easier to follow it.

Hi Ivan.

I will do up a small project to iluustrate both issues.

Hi Ivan.

I have attached a Sample Project to illustrate the second problem I am having. Just trying to Subclass a StratatFrame Form and have the AutoHandleCollisions set to False in my SubClass

In the Sample, My Subclass is called MyForm, and I have a line in it with this.AutoHandleCollisions = false

When I run up my Form (Form2, called from Form1) , I have a button whcih displays a messagebox, indicating what the AutoHandleCollisions property is. It is saying True, even though my BaseClass has set it to false. (This may very well be the result of my Inexperience of Subclassing a Form and I may have left out something or not done it the correct way.

(Sample project based on the Customers Tbale in the StartaFrame sample database)

Hi Ivan.

Any update on this. (Trying to subclass a and have the AutoHandleCollisions set to False in my SubClass...see attached Sample on laste thread)

Hi Ger.

I tried to have a look at your sample but couldn't find out how to solve your problem. As I told you, I do vb.net and tried to Google how the C# inheritance should behave, but didn't get to a conclusion why yours is not working. In my solutions, my base form is set with AutoHandleCollisions to False and all inherited forms from it also has it like that.

So, I hope someone will jump in and clarify this for you.

Hi Ivan. I am back to the concurrency issue  now. I have resolved being able to SubClass a Form (Uing C#) , thanks to another thread.

To Recap. If there is a DataColission, I want to add the fact to the BrokenRules collection and display a Message indicating this, and not allow the save. I have atached a Sample App. I have done the following in the App:

In my Base Form, Set AutoHandleCollisions to False

In the BO, left the CollisionNotificationType to RaiseEvent (The Default)

In My Base BO, put code into the BO_ConcurrencyException event as follows:

1. AddBrokenRule message

2. e.ReSaveRecord = true  (Set the flag so it will attempt to Resave the data) 

3.  this.Save  (Attemp to Save the record, which then should trigger the broken rules)

What is happening is that , for the Concurrency problem  record, The Broken Rule is NOT being displayed . It does not save the record (which is fine) but I want it to display the BrokenRules to indicate to the user that there has been a problem.

Hi Ger.

I have changed your sample project and am posting it here back to you.
I have created a new Base BO and added some code to it to demonstrate how you can accomplish what you are looking for.
If you feel like it, have a look at the help file under "Application Framework" -> "Business Layer" -> "Common Business Object Tasks" ->"Creating and Checking Business Rules" to get the a better understanding of the flow.

Hope it helps.

Hi Ivan.

I have downloaded and extracted the amnded sample and it does what I want. Many thanks for putting in the time.

I will need to have a look at the code to get an understanding of how it works.

You're welcome, Ger.

Hi Ivan. I am now trying to incorporate your suggestions into my live project  and am having two problems:

1. In the Base SubClass, when I try to add InitializeComponent into each constructor, it comes up with a error in the compiler (InitializeComponent does not exist in the current context)..... now if I comment the line out, it seems to work ok... Do I need this line in ?

2. In my actaul BO classes, I need to have specific code in the CheckRulesOnCurrentRow, so I want to run the Base Code in my subclass. When I put in  base.CheckRulesOnCurrentRow()  or base.CheckRulesOnCurrentRow(CheckRulesEventArgs e) I  get a complier message --> CheckRulesOnCurrentRow can only appear on the left hand side of += or -=

     

Hi. I am really stuck on this as I cannot seem to get the Base Code running from my specific CheckRulesOnCurrentRow

Any feedback appreciated

Anbody ?