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In the Declarations section of the module, you can find two variables that the event procedures use to pass information between events. (If you declare the variables inside one of the procedures, only that procedure can use the variables.) The Before Update event procedure for the contact event type checks to see if the event is a product sale (by examining one of the hidden columns in the combo box row source). If the user is trying to log a product sale and this particular contact doesn t have a default company defined, the code displays an error message and won t let the user save that event type. Remember, a record in the tblContactProducts table must have a CompanyID as well as a ContactID. When the user attempts to save a new or changed event record, Access runs the form s Before Update event procedure. This code again checks to see if the record about to be saved is for a product sale. However, if this isn t a new record or the user is saving an old event record but didn t change the event type, the code exits because it doesn t want to add a product record twice. (If this is an existing record and the event type didn t change, this code probably created the companion contact product record the first time the user saved the record.) The 912

Automating Your Application with Visual Basic code could insert the record into tblContactProducts at this point, but, as you learned in 21, the record isn t really saved until after the Before Update event finishes. So, this code sets the module variable to tell the form s After Update event procedure to perform that task after Access has saved the changed record. After Access saves the new or changed event record, it runs the form s After Update event procedure. If the code in the Before Update event procedure indicated that a product insert is required by setting the module intProductAdd variable to True, this code sets up to add the new record. It opens a recordset on the tblProducts table for the product that was just sold so that it can get the product price and check for any prerequisite product. If the product has a prerequisite but this contact doesn t own the prerequisite, the code displays an error message and exits. Although previous code checked to see that this contact has a default CompanyID, this code checks again and exits if it can t find one. After the code has completed all checks and has the price and company ID information it needs, it inserts the new record into the tblContactProducts table using SQL. Notice at the bottom of the procedure you can find error-trapping code that tests to see if the insert caused a duplicate record error.

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Setup must know the partition format before it writes a boot sector because the contents of the boot sector vary depending on the format. For a partition that is in NTFS format, Windows writes NTFS-capable code. The role of the boot-sector code is to give Windows information about the structure and format of a volume and to read in the Bootmgr file from the root directory of the volume. Thus, the boot-sector code contains just enough read-only file system code to accomplish this task. After the boot-sector code loads Bootmgr into memory, it transfers control to Bootmgr s entry point. If the boot-sector code can t find Bootmgr in the volume s root directory, it displays the error message BOOTMGR is missing . Bootmgr begins its existence while a system is executing in an x86 operating mode called real mode. In real mode, no virtual-to-physical translation of memory addresses occurs, which means that programs that use the memory addresses interpret them as physical addresses and that

We re not arguing here whether the schema shown in figure 8.9 is the best. We re using it as an example. You need to determine how your data is best stored in terms of normalization.

Earlier, in Linking to Related Data in Another Form or Report on page 902, you learned one technique for using a command button to link to a related task. The key task in the Housing Reservations application for the housing manager (or any administrator) is to assign a room and book a reservation for pending requests. When you click one of the Book buttons on the Unbooked Requests form, code behind the form opens a form to show the manager the rooms that match the request and aren t booked for the time span requested. If you click the request from Pilar Ackerman for a one-bedroom suite with two queen beds from July 25, 2003, to August 5, 2003, you ll see the list of available rooms in the fdlgAvailableRooms form as shown in Figure 23-26 on the next page. 913

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The query that provides the records displayed in the frmUnbookedRequests form includes crieteria to exclude any requests that have a check-in date earlier than today s date. (It doesn t make sense to confirm a reservation request for a date in the past.) The latest requested check-in date in the original sample database is October 3, 2003, so you probably will see an error message when you attempt to look at unbooked requests. You can use the zfrmLoadData form to load new reservations and requests that are more current into the qryUnbookedRequests query to not eliminate old requests to be able to see how the frmUnbookedRequests form works.

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