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As a result of the problems encountered in a disconnected environment, an alternative strategy was typically used. The alternative, optimistic concurrency model allowed any user to make changes to their copy of the data. When the values were saved, the program would check the previous values to see if they were changed. If the values were unchanged, the record would be considered unlocked, thus the record would be saved. If there was a conflict, the program would need to know whether to automatically overwrite the previous changes, throw away the new changes, or somehow merge the changes. The first half of determining optimistic concurrency is relatively simple. Without a concurrency check, the SQL statement to the database would consist of the following syntax: UPDATE TABLE SET [field = value] WHERE [Id = value]. To add optimistic concurrency, the WHERE clause would be extended to not only include the value of the ID column, but also compare the original values of each column in the table. Listing 8.1 demonstrates a sample SQL statement to check for optimistic concurrency on our running example s Book table.

' Select the database window DoCmd.SelectObject acForm, "frmSplash", True ' .. and hide it RunCommand acCmdWindowHide

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The procedure hides the Database window by selecting a known object in the Database window to give the Database window the focus and then executing the WindowHide command. The splash form waits for a timer to expire (the Timer event procedure) and then opens a form to sign on to the application. When you sign on successfully, the frmMain form finally opens. The frmMain form in the LawTrack Contacts application has no Close button and no Control-menu button. The database also has an AutoKeys macro defined that intercepts any attempt to close a window using the Ctrl+F4 keys. (You ll learn about creating an AutoKeys macro in the next section.) So, you must click the Exit button on the frmMain form to close the application. On the other hand, the frmMain form in the Housing Reservations application does allow you to press Ctrl+F4 or click the Close button to close the form and exit the application.

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UPDATE dbo.Book SET Title = @NewTitle, Subject = @NewSubject, Publisher = @NewPublisher, PubDate = @NewPubDate, Price = @NewPrice,

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more complex entity structures. They are calling this technology the ADO.NET Entity Framework (EF). The EF separates the physical from the logical models by using a series of XML-based mapping files (see figure 8.10). In the EF, the physical database is mapped to a logical model using a one-toone relationship between the tables and logical layer entities. The logical entities are defined through an XML-based Store Schema Definition Language (SSDL) file. These mappings are similar to those we defined in LINQ to SQL. The EF moves beyond LINQ to SQL by using another XML-based file (Mapping Schema Language or MSL) to map the logical model to a conceptual model. The conceptual model is yet another XML file using a Conceptual Schema Definition Language (CSDL). These conceptual entities can be further converted into strongly typed objects if desired. With the EDM established, we can query it with a string-based query language called Entity SQL. In addition, our LINQ knowledge can be applied against the EDM by using LINQ to Entities. Since the EDM represents a true abstraction layer between the application and database, we can modify our database and EDM mapping file and restructure the data store without having to recompile the application. The separation of layers we get from the EDM allows for an increased separation between the physical and logical. This allows us to change our data model and mapping structures and leave our application intact. Additionally, since the

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Microsoft Office Access 2003 Inside Out You should always write code to clean up any open forms, reset variables, and close any open recordsets when the user asks to exit your application. Because the user can t close the frmMain form in the LawTrack Contacts application except by clicking the Exit button, you ll find such clean-up code in the command button s Click event. In the frmMain form in the Housing Reservations database, the clean-up code is in the form s Close event procedure. The code in both forms is similar, so here s the exit code in the LawTrack Contacts sample application:

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