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Before you can switch on the editing features in a given control, you need to define suitable commands for the operations you want to perform in your data source. That means supplying commands for inserting (InsertQuery), deleting (DeleteQuery), and updating (UpdateQuery). If you know you will allow the user to perform only certain operations (such as updates) but not others (such as insertions and deletions), you can safely omit the commands you don t need. You define the InsertCommand, DeleteCommand, and UpdateCommand in the same way you define the command for the SelectCommand property by using a parameterized query. For example, here s a revised version of the SqlDataSource for product information that defines a basic update command to update every field:

into creating a domain model, creating additional, separate Command classes is quite counterintuitive. The Command classes often end up being thin wrappers around your domain classes, which seems like rather a waste to us. Instead, try to use your domain classes where you would normally create an additional Command class. We show an example of this in the next chapter, with the CustomerReview domain class.

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<asp:SqlDataSource ID="sourceProductDetails" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT ProductID, ProductName, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued FROM Products WHERE ProductID=@ProductID" UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, UnitsInStock=@UnitsInStock, UnitsOnOrder=@UnitsOnOrder, ReorderLevel=@ReorderLevel, Discontinued=@Discontinued WHERE ProductID=@ProductID"> <SelectParameters> <asp:ControlParameter ControlID="lstProduct" Name="ProductID" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource>

As of Android 1.5, Google Maps is not strictly part of the Android SDK. Instead, it is part of the Google APIs add-on, an extension of the stock SDK. The Android add-on system provides hooks for other subsystems that may be part of some devices but not others. NOTE: Google Maps is not part of the Android open source project, and undoubtedly there will be some devices that lack Google Maps due to licensing issues. For example, at the time of this writing, the Archos 5 Android tablet does not have Google Maps. By and large, the fact that Google Maps is in an add-on does not affect your day-to-day development. However, bear in mind the following: You will need to create your project with a suitable target to ensure the Google Maps APIs will be available. To test your Google Maps integration, you will also need an AVD that supports the Google Maps API.

Note In this chapter, the text for some of the commands is too long to fit on a single line. In this case, it

The view is the JSP page that will generate the HTML that the user sees. Controllers in Spring generally return a ModelAndView object, which tells Spring what view to send back to the browser and what model data to populate it with.

appears on several lines to fit the dimensions of the page. However, in your .aspx page, you need to place the entire text of an individual command on one line.

In this example, the parameter names aren t chosen arbitrarily. As long as you give each parameter the same name as the field it affects, and preface it with the @ symbol (so ProductName becomes @ProductName), you don t need to define the parameter. That s because the ASP.NET data controls automatically submit a collection of parameters with the new values before triggering the update. Each parameter in the collection uses this naming convention, which is a major time-saver. You also need to give the user a way to enter the new values. Most rich data controls make this fairly easy with the DetailsView, it s simply a matter of setting the AutoGenerateEditButton property to True, as shown here:

<asp:DetailsView ID="DetailsView1" runat="server" DataSourceID="sourceProductDetails" AutoGenerateEditButton="True" />

c# make thumbnail of pdf

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