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One thing to keep in mind, if you have columns that apply to some derived classes but not others, they need to be marked as Nullable in the database. Otherwise, updating values in the table on objects that don t implement those properties will throw an exception because the values were not supplied. We ve only scratched the surface of the capabilities that inheritance can offer. As long as the data is limited to a single table, implementing inheritance with LINQ to SQL is relatively painless. The InheritanceMapping attributes on the base class and Discriminator column on the table are all that we need. The inheritance model supported by LINQ to SQL does suffer from a couple of weaknesses. First, the runtime requires that the base class of the object hierarchy

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var subjects = dataContext.GetTable<Subject>(); var books = dataContext.GetTable<Book>(); var query = from subject in subjects from book in books where subject.SubjectId == book.SubjectId select new { subject.Name, book.Title, book.Price };

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Microsoft Office Access 2003 Inside Out LawTrack Contacts and the Housing Reservations sample applications provide this enhancement. The two applications actually have two different versions of a calendar form one that employs the Calendar ActiveX control (frmCalendarOCX), and a second (frmCalendar) that uses Visual Basic code to draw the calendar on a form using an option group and toggle button controls. This graphical facility is available in the sample applications wherever you see a small command button next to a date or date/time field on a form. Click the button to open the calendar and set the value. One date field that uses the ActiveX version of the calendar is the Birth Date field on the frmContacts form. You can see the open calendar in Figure 23-5.

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The code in the Click event of this command button calls a public function to open the form and pass it the related control that should receive the resulting date value. You can find this code in the module for the frmContacts form as shown below.

More than 15 years ago, the ANSI-92 standard replaced ANSI-82. Reverting to the older ANSI-82 syntax may appear unusual. Fortunately, LINQ also supports the join syntax reminiscent of the ANSI-92 SQL syntax. The previous query expression can be rewritten as shown in listing 6.17.

Private Sub cmdContactBirthCal_Click() Dim varReturn As Variant Clicked the calendar icon asking for graphical help Put the focus on the control to be updated Me.BirthDate.SetFocus Call the get a date function varReturn = GetDateOCX(Me.BirthDate, True) End Sub

When the user clicks the command button, Access moves the focus to it. The code moves the focus back to the date field to be edited and calls the public function where the real action happens. You can find the code for the function GetDateOCX in the modCalendar module, and the code is also listed below.

Option Compare Database Option Explicit Place holder for the form class Dim frmCalOCX As Form_frmCalendarOCX

End Declarations Section Function GetDateOCX(ctlToUpdate As Control, _ Optional intDateOnly As Integer = 0) ---------------------------------------------------------- Inputs: A Control object containing a date/time value Optional "date only" (no time value) flag Outputs: Sets the Control to the value returned by frmCalendar Created By: JLV 11/15/02 Last Revised: JLV 11/15/02 ---------------------------------------------------------- Set an error trap On Error GoTo ProcErr Open the OCX calendar form by setting a new object NOTE: Uses a module variable in the Declarations section so that the form doesn t go away when this code exits Set frmCalOCX = New Form_frmCalendarOCX Call the calendar form s public method to pass it the control to update and the "date only" flag Set frmCalOCX.ctlToUpdate(intDateOnly) = ctlToUpdate Put the focus on the OCX calendar form frmCalOCX.SetFocus ProcExit: Done Exit Function ProcErr: MsgBox "An error has occurred in GetDateOCX. " _ & "Error number " & Err.Number & ": " & Err.Description _ & vbCrLf & vbCrLf & _ "If this problem persists, note the error message and " _ & "call your programmer.", , "Oops . . . (unexpected error)" Resume ProcExit End Function

var query = from subject in subjects join book in books on subject.SubjectId equals book.SubjectId select new { subject.Name, book.Title, book.Price };

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