qr code generator vb net open source Figure 8-20 Execution of the CarTracker application in Visual Basic .NET

Printer Code-39 in Visual Basic .NET Figure 8-20 Execution of the CarTracker application

Figure 8-20 Execution of the CarTracker application
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8: Managing the Data
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If you want the same data in Visual Studio as you have when executing the application in debug mode, you must close your project completely. Using Windows Explorer, copy the .mdf and .ldf files from the bin\debug folder to the project folder. When you reopen your project, the database will now contain the same content. Suppose you then want to modify the structure of your database, such as adding a column to a table. If you don t want to lose the data within the bin\debug database files, you must copy them to the project folder before you modify the table structure. When done with the modifications, you simply copy both the .mdf and .ldf files back to the bin\debug folder. Of course, if your application needs those new database changes, you will also have to modify the dataset, but that process is beyond the scope of this book.
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20. After changing the URL for the record, click the disk icon to commit the changes to the database. 21. Close the CarTracker application, and restart it by pressing F5. You should now see the first row with the modified URL ending in .net. Close the application again. 22. To verify that you are working with design-time and run-time versions of the CarTracker database, open the Listing table, and select Show Table Data in Database Explorer. The first row should still contain an URL column ending in .com and not in .net. Point proven! The database file in Visual Studio is now decoupled from the one your application is using at run time. Read the More Info note in the left margin to learn how to make the data the same in both the design-time and run-time versions.
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When you dragged the Listing dataset table to the designer surface, you probably saw that five items were added in the gray area below the designer surface. This section of the designer surface is called the component tray and is the section Visual Studio uses for nonvisual controls. In this case, it added an instance of the CarTracker dataset, a Listing table adapter, a Listing binding source, a table adapter manager, and finally a Listing binding navigator. I ll describe several of these individually: Binding source You can think of a binding source as a broker or a layer of indirection. You can also think of it as an intermediary between a data-bound control on your form and a data source, such as a dataset. A binding source provides currency management and notification services (events). The binding source has many methods to facilitate, such as sorting, filtering, navigating, and editing of data from its databound controls to the data source. It s also linked tightly to the next component: the binding navigator. When you see a binding navigator, you re assured of getting a binding source.
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Binding navigator The binding navigator is a means to add navigation and data manipulation. It has a UI component or, more specifically, a tool strip with buttons to facilitate the functionality provided by the binding source. Typed dataset Although you know what a dataset is, you might not know that it s a strongly typed object. It contains data tables of the DataTable type that constitute the in-memory representation of your database tables. These data tables also have a special data adapter called the table adapter. There is a table adapter for each data table. Table adapter A table adapter is a data access object. It connects to the database (for example, SQL Server 2005 Express Edition), executes the queries, and fills a data table with data when it returns from SQL Server. Therefore, it s the central point for all data access on an individual table. There is one table adapter per table in your data source. A table adapter can have more than one SELECT query. Table adapter manager The TableAdapterManager class has been added in .NET 3.5 to help you to maintain referential integrity to your typed datasets. It adds logic to maintain it and lets you specify in which order the CRUD (create, read, update, delete) transactions are happening. For instance, you can say that the update order is insertupdate-delete or update-insert-delete. It also helps you to have a single point of update, so instead of calling the update method on each table adapter, you just have to call the TableAdapaterManager.UpdateAll method to save the changes to the database.
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