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There are a variety of good reasons to use the DataSet to hold onto data in memory. Here are a few: You need to do something time-consuming with the data. By dumping it into a DataSet first, you ensure that the database connection is kept open for as little time as possible. You want to use ASP .NET data binding to fill a web control (like a grid) with your data. Although you can use the DataReader, it won t work in all scenarios. The DataSet approach is more straightforward. You want to navigate backward and forward through your data while you re processing it. This isn t possible with the DataReader, which goes in one direction only forward. You want to navigate from one table to another. Using the DataSet, you can store several tables of information. You can even define relationships that allow you to browse through them more efficiently. You want to save the data to a file for later use. In 19 you ll learn how any DataSet object can be saved in XML format in an ordinary file. You need a convenient package to send data from one component to another. For example, in 23 you ll learn to build a database component that provides its data to a web page using the DataSet. A DataReader wouldn t work in this scenario, because the database component would need to leave the database connection open, which is a dangerous design. You want to store some data so it can be used for future requests. 24 demonstrates how you can use caching with the DataSet to achieve this result.

The DataSet tracks the changes you make to the records inside. This allows you to use the DataSet to update records. The basic principle is simple. You fill a DataSet in the normal way, modify one or more records, and then apply your update using a DataAdapter. However, ADO.NET s disconnected update feature makes far more sense in a desktop application than in a web application. Desktop applications run for a long time, so they can efficiently store a batch of changes and perform them all at once. But in a web application, you need to commit your changes the moment they happen. Furthermore, the point at which you retrieve the data (when a page is first requested) and the point at which it s changed (during a postback) are different, which makes it very difficult to use the same DataSet object, and maintain the change tracking information for the whole process. For these reasons, the great majority of ASP.NET web applications use the DataSet to store data but not to make updates. Instead, they use direct commands to commit changes. This is the model you ll see in this book.

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You can drag each pane with the mouse and dock them at other locations within the main window. You can also add each pane as a separate tab to an existing pane. For example, referring to Figure 2-17, to make the Loaded Scripts tab exist within the Local Variables pane, drag and drop the Loaded Scripts tab to the Local Variables tab. You can also undock the panes from the main window by clicking the docking button located on the left side of the pane s title bar. Docking the pane back to the main window is as easy as clicking the docking button again. As you work with Venkman, you ll get a feel for the panes that you use most often. Close the panes you don t often use by clicking the X button on the right side of the pane s title bar. You can reopen panes by selecting View Show/Hide. If at any time you want to return the pane layout to the default setting, enter /restore-layout factory at the commandline interface in the Interactive Session pane.

app/models/ test/unit/ test/fixtures/ app/models/actor.rb test/unit/actors_test.rb test/fixtures/actor.yml db/migrate db/migrate/002_create_actors.rb

With disconnected data access, a copy of the data is retained in memory while your code is running. Figure 15-16 shows a model of the DataSet.

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