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When you build an application that tracks the scheduling of events or reservations that can span a period of time, you most likely need to make sure that a new event or reservation doesn t overlap with an existing one. This can be a bit tricky, especially when the records you re checking have start and end dates or times. Of course, the Housing Reservations application (Housing.mdb) must make sure that an employee doesn t enter an overlapping reservation request. To see how this works, open the sample database and then open the frmSplash form to start the application. Choose any employee name you like from the combo box in the sign-on dialog box (Kevin McDowell is a good choice), type password as the password, and click the Sign On button. On the main switchboard, click the Reservation Requests button, and then click Edit All in the Edit Reservation Requests dialog box.

In the generated code, we fetch the list of subjects, then as we iterate through each item, we issue a separate query for each book, passing in the id column of the subject for each row. This means that instead of issuing one statement, we send separate statements for each child record. Before improving the situation, let s make it worse. In this case, copy the last line and paste it twice so that we call ObjectDumper.Write twice. Step through the code and pay attention to the SQL that is generated. We will spare you from having to read the gory results again here. In this case, all of the queries were sent to the database twice, once for each Write method. We ve now turned a very good thing (lazy loading) into a potentially bad thing (too much network traffic to the database). What can we do to improve the situation

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Automating Your Application with Visual Basic The Reservation Requests form won t let you enter a reservation start date in the past. Click in the blank new row in the list of reservation requests, enter a reservation request for next week for a span of several days, and save the row. (Remember, you can click the Calendar buttons next to the dates to help you choose dates.) Enter another request that overlaps the reservation you just created either at the beginning, the end, or across the middle of the reservation you just entered. Try to save the row, and you should see a warning message similar to the one in Figure 23-10.

Figure 23-10. The Housing Reservations application displays a warning when you attempt to save an overlapping reservation request.

If you click No, the code cancels your save and returns you to the record to fix it. Notice that you can click Yes to save the duplicate the application allows this because an employee might want to intentionally reserve two or more rooms on the same or overlapping dates. The code that performs this check in the Before Update event of the fsubReservationRequests form is as follows:

Dim varNum As Variant Check for overlap with existing request Try to grab RequestID - will be Null on unsaved row varNum = Me.RequestID If IsNull(varNum) Then varNum = 0 Set dummy value If Not IsNull(DLookup("RequestID", "tblReservationRequests", _ "(EmployeeNumber = " & _ Me.Parent.EmployeeNumber & ") AND (CheckInDate < #" & Me.CheckOutDate & _ "#) AND (CheckOutDate > #" & Me.CheckInDate & "#) AND (RequestID <> " & _ varNum & ")")) Then If vbNo = MsgBox("You already have a room request " & _ "that overlaps the dates you have " & _ "requested. Are you sure you want to make this request ", _ vbQuestion + vbYesNo + vbDefaultButton2, gstrAppTitle) Then Cancel = True

If all we want to do is fetch the results more than once, we can prefetch them and store them in an array or list using the ToList, ToDictionary, ToLookup, or ToArray extension methods. Thus, we could change our earlier implementation to indicate that we want to load all of the customers once and then continue to use the results as long as our subjects variable is in scope.

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var subjects = dataContext.GetTable<Subject>().ToList<Subject>();

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