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To use your new stored procedure, you need to modify the ShoppingCartAccess class. Rather than removing the old CreateOrder method, however, add the following method: // Create a new order with customer ID public static string CreateCommerceLibOrder() { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CreateCustomerOrder"; // create parameters DbParameter param = comm.CreateParameter(); param.ParameterName = "@CartID"; param.Value = shoppingCartId; param.DbType = DbType.String; param.Size = 36; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@CustomerId"; param.Value = Membership.GetUser( HttpContext.Current.User.Identity.Name) .ProviderUserKey; param.DbType = DbType.Guid; param.Size = 16; comm.Parameters.Add(param); // return the result table return GenericDataAccess.ExecuteScalar(comm); } This new method, CreateCommerceLibOrder, is more or less the same as the old order-placing code, but there is a new parameter to use: @CustomerID. The GUID to use for this customer identification is obtained using the ASP.NET membership classes. You obtain a MembershipUser class using Membership.GetUser by passing the name of the current user obtained from the current context. Next, you use the ProviderUserKey property of the MembershipUser object you receive to obtain the unique GUID that identifies the current user. Note the naming of this new method, which includes the name CommerceLib. In later chapters, this name helps identify the new code that is associated with the new, advanced order-processing scheme.

Just as an activity and intent receiver are both Java classes, so is a content provider. So, the big step in creating a content provider is crafting its Java class, with a base class of ContentProvider. In your subclass of ContentProvider, you are responsible for implementing six methods that, when combined, perform the services that a content provider is supposed to offer to activities wishing to create, read, update, or delete content.

1 1 0 1 0 0 1 0 1 1

You ll use the preceding method in the checkout page you added in the last chapter. You ll do this in the following exercise, as well as add an order confirmation page that users will be redirected to after placing an order.

onCreate()

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1. Modify the placeOrderButton_Click method in Checkout.aspx.cs as follows: protected void placeOrderButton_Click(object sender, EventArgs e) { // Store the total amount because the cart // is emptied when creating the order decimal amount = ShoppingCartAccess.GetTotalAmount(); // Create the order and store the order ID string orderId = ShoppingCartAccess.CreateCommerceLibOrder(); // Redirect to the confirmation page Response.Redirect("OrderPlaced.aspx"); } 2. Add a new Web Form to the project called OrderPlaced.aspx by using the BalloonShop.master Master Page: <%@ Page Language="C#" MasterPageFile="~/BalloonShop.master" AutoEventWireup="true" CodeFile="OrderPlaced.aspx.cs" Inherits="OrderPlaced" %> <asp:Content ID="Content1" ContentPlaceHolderID="contentPlaceHolder" runat="Server"> <span class="InfoText"> Thank you for your order, please come again! </span> </asp:Content> 3. Add the following title-setting code and method override to the code-behind file for this form, OrderPlaced.aspx.cs: protected override void OnInit(EventArgs e) { (Master as BalloonShop).EnforceSSL = true; base.OnInit(e); } protected void Page_Load(object sender, EventArgs e) { // Set the title of the page this.Title = BalloonShopConfiguration.SiteName + " : Order Placed"; }

Tip You can use Google to convert between a decimal and a binary number and vice versa. So to convert 171 decimal to binary, type 171 in binary into the Google search box which returns 171 = 0b10101011 The 0b prefix shows the number is a binary number and not a decimal number. So the answer is 10101011. To convert a binary number to decimal, do the reverse. Enter 0b11001100 in decimal into the search box, and it returns 0b11001100 = 204

4. Modify web.config as follows: <!-- Only existing customers can access OrderPlaced.aspx --> <location path="OrderPlaced.aspx"> <system.web> <authorization> <allow roles="Customers" /> <deny users="*" /> </authorization> </system.web> </location> 5. Place an order or two using the new system to check that the code works. You ll need to log on to do this and supply enough details to get past the validation on the checkout page.

As with an activity, the main entry point to a content provider is onCreate(). Here, you can do whatever initialization you want. In particular, here is where you should lazyinitialize your data store. For example, if you plan on storing your data in such-and-so directory on an SD card, with an XML file serving as a table of contents, you should check and see if that directory and XML file are there; if not, create them so the rest of your content provider knows they are out there and available for use. Similarly, if you have rewritten your content provider sufficiently to cause the data store to shift structure, you should check to see what structure you have now and adjust it if what you have is out of date. You don t write your own installer program. This means that you have no great way of determining if, when onCreate() is called, this is the first time ever for the content provider, the first time for a new release of a content provider that was upgraded in place, or just a normal startup. For example, here is the onCreate() method for Provider, from the ContentProvider/ConstantsPlus sample application:

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