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Each of these is documented in the JDBC Connection API, and you can learn more in chapter 7. The important thing to note here is that if your transaction manager implementation does not support one or more of these, you should be sure to throw an exception to let the developer know. Otherwise, there could be unexpected consequences that are difficult for your users to debug. The next pair of methods are getDataSource() and setDataSource(). These methods describe a JavaBeans property for the DataSource associated with this TransactionConfig instance. Usually you won t have to do anything special with the DataSource, but it is provided here so that you can decorate it with additional behavior if you need to. Many transaction manager implementations wrap the DataSource and the Connection objects it provides, to add transaction related functionality to each of them. The final pair of methods makes up another JavaBeans property that allows the framework to configure a maximum number of concurrent transactions supported. Your implementation may or may not be configurable, but it is important to ensure that you throw an appropriate exception if the number set is too high for your system to handle.

DeleteObject is a bit different: Protected Sub ProjectDataSource_DeleteObject( _ ByVal sender As Object, ByVal e As Csla.Web.DeleteObjectArgs) _ Handles ProjectDataSource.DeleteObject Try Project.DeleteProject(New Guid(e.Keys("Id").ToString)) Session("currentObject") = Nothing e.RowsAffected = 1 Catch ex As Csla.DataPortalException Me.ErrorLabel.Text = ex.BusinessException.Message e.RowsAffected = 0 Catch ex As Exception Me.ErrorLabel.Text = ex.Message e.RowsAffected = 0 End Try End Sub If the user clicks the link in the DetailsView control to delete the project, the DeleteObject event is raised. e.Keys contains the Id row value from the DetailsView, because the DataKeyNames property on the control is set to Id. This value is used to create a Guid, which is then passed to the Shared DeleteProject() method to delete the project. Of course, this immediately deletes the Project using the data portal, and so proper exception handling is implemented to display any exception messages in ErrorLabel. Once the Project has been deleted, it makes no sense to leave the user on ProjectEdit. If the delete operation is successful, the DetailsView control raises an ItemDeleted event: Protected Sub DetailsView1_ItemDeleted( _ ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DetailsViewDeletedEventArgs) _ Handles DetailsView1.ItemDeleted Response.Redirect("ProjectList.aspx") End Sub The user is simply redirected to ProjectList, where she should no longer see the deleted project in the list.

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These files don t belong to the project directly; project contains the NHibernate they re linked from elsewhere. We do this because mapping for Visitor. multiple projects need the same copy of these files. The first example that needs linked files is IntegrationTests it will contain tests for all data access. To test the data access, the tests need to leverage the same configuration as the application. We ve already covered the hibernate.cfg.xml file. The Log4Net.config file contains log4net configuration information that s broadly applicable to any type of application. If you re not familiar with Apache log4net, you can find more information at http:// logging.apache.org/log4net/index.html. The two XSD files provide the schema for the NHibernate configuration and the NHibernate mapping files. When added to the project, they enable Visual Studio to provide XML IntelliSense when we re editing these files, which makes the editing process smooth. In larger applications, you ll have a mix of code-based mappings and XML mappings (which are the most comprehensive and documented and are necessary in some situations). Without this XML IntelliSense, it would be cumbersome to maintain these XML files. Let s now turn to the mapping for the Visitor class. The VisitorMap.cs file is shown in listing 23.6. The equivalent XML mapping is included at the end of the listing for reference.

The new data binding in Windows Forms uses BindingSource controls. These controls sit between all the data bound controls in the UI and the actual data source object in this case, Roles.

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