StrataFrame Forum » StrataFrame Application Framework - V1 » Business Objects and Data Access (How do I?) » Dynamic DataSourceKey?

Dynamic DataSourceKey?

dgsoft — Wed, 17 Jun 2009 06:55:01 GMT

Hi,
I want on fly in my application switch between databases, each of them has own DataSourceKey.

My problem is - If I not write the DataSourceKey hardcoded for BO component, I have an error like DataSourceKey is empty...
The question is - how can I make dynamic datasourcekey and also.. question.. can businessobjectmapper as default take my subclass of businesslayer, where I can add additional standard functionality for my projects.

For this purpose I thought to do

[code]
Public Class PSOFormStore_PensBO
Inherits MicroFour.StrataFrame.Business.BusinessLayer

#Region " Data Retrieval Methods "

Overloads ReadOnly Property DataSourceKey() As String
Get
Return(DatabaseManager.GetCurrentDataSourceKey())
End Get
End Property
#End Region
End Class

Public Class DatabaseManager
Public Shared Function GetCurrentDataSourceKey() as String
Return("TEST")
End Func
End Class
[/code]

RE: Dynamic DataSourceKey?

Trent L. Taylor — Wed, 17 Jun 2009 06:55:01 GMT

If you change the data source key of a BO instance, you will have call the ReCreateDataLayer method on the BO to have it pull from the new data source key. That is the ONLY trick.

[codesnippet]MyBO.DataSourceKey = "NewKey"
MyBO.ReCreateDataLayer()[/codesnippet]

As for creating a subclassed BO, that is not something you need to do through the BO Mapper. When you create a new BusinessLayer, just change the inheritance once. This is done in the main class instead of the Designer file so that the BO Mapper leaves the inheritance alone. But if you put the inheritance declaration on the partial class (designer file) it will be overwritten every time the partial is rebuilt. This is why, by default, we put the inheritance in the main file. That is all that is required.