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According to this second command prompt, the file doesn t even exist. Now simulate a nontransacted writer by trying to add data to the file via the echo command: 1. 2. C:\>echo Hello > TransactionDemo.txt The function attempted to use a name that is reserved for use by another transaction. As expected, nontransacted writers are blocked from modifying the file. The Ktmutil and Fsutil built-in applications can be very useful for dealing with transactional operations on the file system. For example, you can get a list of all current transactions on the system with the following command: 1. 2. 3.

belong to each category. Listing 6.14 uses an anonymous type on our select clause to take our grouped book collections and return the count of the books by subject.

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Microsoft Office Access 2003 Inside Out Note You can find the ADO equivalent of the previous example in the modExamples module in the LawTrack Contacts sample database. You should now have a basic understanding of how to create functions and subroutines using Visual Basic. In the next chapter, you ll enhance what you ve learned as you study major parts of the LawTrack Contacts, Housing Reservations, and Wedding List applications.

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Table<Book> books = dataContext.GetTable<Book>(); var query = from book in books group book by book.SubjectId into groupedBooks select new { groupedBooks.Key, BookCount = groupedBooks.Count() };

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Why Aren t We Using Macros . . . . . . . Assisting Data Entry . . . . . . . . . . . . . . . Validating Complex Data. . . . . . . . . . . . Controlling Tabbing on a Multiple-Page Form. . . . . . . . . . . . . . . . 857 859 878 886 Automating Data Selection . . . . . . . . . . 887 Linking to Related Data in Another Form or Report. . . . . . . . . . . . . . . . . . . . 902 Automating Complex Tasks . . . . . . . . . . 909 Automating Reports . . . . . . . . . . . . . . . . 917

Now that you ve learned the fundamentals of using Microsoft Visual Basic, it s time to put this knowledge into practice. In this chapter, you ll learn how to create the Visual Basic code you need to automate many common tasks. You can find dozens of examples of automation in the LawTrack Contacts, Housing Reservations, and Wedding List sample databases. As you explore the databases, whenever you see something interesting, open the form or report in Design view and take a look at the Visual Basic code behind the form or report. This chapter walks you through a few of the more interesting examples in these databases. Note You can find the code explained in this chapter in the LawTrack Contacts (Contacts.mdb) and Housing Reservations (Housing.mdb) sample applications on the companion CD.

Although you can certainly use macros to automate simple applications, macros have certain limitations. For example, as you might have noticed when examining the list of available events in 21, Understanding Event Processing, many events require or return parameters that can be passed to or read from a Visual Basic procedure but not a macro. Also, even though you can write a macro to handle general errors in forms and reports, you can t really analyze errors effectively within a macro nor do much to recover from an error. And as you saw in 21, the debugging facilities for macros are very simplistic.

Notice that in this example, we could return all of the books as we iterate over the result set and then count them on the client. LINQ to SQL offers the additional benefit of performing the count on the server and only returning that value rather than overloading the network with unnecessary data. Here is the corresponding SQL statement for this query:

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Use macros in your application in any of the following circumstances:

Your application consists of only a few forms and reports. Your application might be used by users unfamiliar with Visual Basic who will want to

SELECT COUNT(*) AS [BookCount], [t0].[Subject] AS [SubjectId] FROM [Book] AS [t0] GROUP BY [t0].[Subject]

features to demonstrate your design. However, once you understand Visual Basic, automating a demonstration application is just as easy using event procedures.

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You don t need to evaluate or set parameters passed by certain events, such as AfterDel-

C:\>ktmutil list transactions TxGuid Description -------------------------------------- ----------------------------------------------{5cd5e900-9da8-11dd-8379-005056c00008} Demo Transaction

Confirm, ApplyFilter, BeforeDelConfirm, Error, Filter, KeyDown, KeyPress, KeyUp, MouseDown, MouseMove, MouseUp, NotInList, and Updated.

We continue our tradition of only returning the results we want and not overloading our database or the network with needless data.

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