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In this example, we may want to store our data with the address information normalized into a separate table. However, our business entity may want to combine the author, user, and address information into a single class to reflect the full information about the Author in a single class. If we only want to view this flattened information, we could easily create a server view. The view would isolate the business from needing to remember how to join the tables. The challenge with a view is that once flattened, the metadata needed in order to update records in the original tables is lost. In 1976, Dr. Peter Chen wrote a seminal paper outlining the theory of an entity-relationship model.2 In it, he outlines a separation between the physical model (from the database) and the logical model (in the objects) by inserting a conceptual model. In some ways, this conceptual model is similar to a view in that it can consolidate information from multiple sources. It goes beyond a view in several ways. First, unlike a view, the conceptual Entity Data Model (EDM) includes information about the source of the data so that the tools have enough information about the creation. This metadata indicates where the values came from and consequently where they will go when updated. Additionally, the EDM includes the ability to store both objects and relationships necessary to create fully dynamic object hierarchies in a conceptual model. At the same time that the language teams were designing LINQ, the Microsoft data teams were working on implementing this conceptual model to handle these

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Let s switch to the Housing Reservations application (Housing.mdb) and take a look at the process for confirming a room for a reservation request. To see this in action, you must start the application by opening the frmSplash form, and then sign on as an administrator (Viescas, John L., or LaMee, Brian) using password as the password. From the main switchboard, click Reservation Requests, and then click View Unbooked in the Edit Reservation Requests dialog box. You ll see the Unbooked Requests form (frmUnbookedRequests) as shown in Figure 23-25 on the next page.

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Extensive IntelliSense support (enabled by strong-typing)

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Figure 23-25. The Unbooked Requests form lets administrators view pending requests and start the booking process.

Figure 23-26.

The code behind the Book button on the frmUnbookedRequests form is as follows:

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querying against regular object collections, databases, entities, and XML sources. Because LINQ supports rich extensibility, developers can also easily integrate it with other data sources and providers. Another essential feature of LINQ is that it is strongly typed. This means the following:

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Private Sub cmdBook_Click() Make sure no changes are pending If Me.Dirty Then Me.Dirty = False Open the available rooms form - hidden, dialog and check if any available DoCmd.OpenForm "fdlgAvailableRooms", _ WhereCondition:="Smoking = " & Me.Smoking, _ WindowMode:=acHidden If Forms!fdlgAvailableRooms.RecordsetClone.RecordCount = 0 Then MsgBox "There are no available rooms of this " & _ "type for the dates requested." & _ vbCrLf & vbCrLf & _ "You can change the Room Type or dates and try again.", _ vbInformation, gstrAppTitle DoCmd.Close acForm, "fdlgAvailableRooms"

only the first 1 MB of the computer s physical memory is accessible Simple MS-DOS programs execute in a real-mode environment However, the first action Bootmgr takes is to switch the system to protected mode Still no virtual-to-physical translation occurs at this point in the boot process, but a full 32 bits of memory becomes accessible After the system is in protected mode, Bootmgr can access all of physical memory After creating enough page tables to make memory below 16 MB accessible with paging turned on, Bootmgr enables paging Protected mode with paging enabled is the mode in which Windows executes in normal operation After Bootmgr enables protected mode, it is fully operational However, it still relies on functions supplied by BIOS to access IDE-based system and boot disks as well as the display.

Exit Sub End If Show the available rooms - form will call our public sub to create the res. Forms!fdlgAvailableRooms.Visible = True End Sub

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