Pro .NET 2.0 Extreme Programming 2006 phần 9 pot

Add Button to Check Out the Shopping Cart Contents Task The first web layer task is to add a button to the DisplayShoppingCart.aspx so that users can start the process of placing their o

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OdbcCommand dataCommand = new OdbcCommand();

dataCommand.Connection = dataConnection;

// Build command stringStringBuilder commandText =new StringBuilder("DELETE FROM [Orders Details] WHERE OrdersID = ");

commandText.Append(orderID);

commandText.Append(" and ProductID = ");

commandText.Append(productID);

dataCommand.CommandText = commandText.ToString();

int rows = dataCommand.ExecuteNonQuery();

// Make sure that the DELETE workedAssert.AreEqual(1, rows, "Unexpected Orders Details row count, gasp!");

dataConnection.Close();

lineItem = null;

}catch(Exception e){

Assert.Fail("Orders Details database error: " + e.Message);

}}}}

Listing 15-10.OrderDetailData.cs File

#region Using derectives

}

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public static int InsertLineItem(int orderID, LineItem lineItem){

int rows = -1;

try{Product product = lineItem.Item;

OdbcConnection dataConnection = new OdbcConnection();

dataConnection.ConnectionString = DataUtilities.ConnectionString;dataConnection.Open();

// Build command stringStringBuilder commandText =new StringBuilder("INSERT INTO [Orders Details] (");

Console.WriteLine(e.Message);

}

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return rows}

}}

Listing 15-11.OrderDetail.cs File

#region Using directives

private int orderID;

private int productID;

private decimal unitPrice;

private int quantityOrdered;

private float discount;

public OrderDetail(){

}public OrderDetail(int orderID,int productID,

decimal unitPrice,int quantityOrdered,float discount){

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public int OrderID{

get{return this.orderID;

}set{this.orderID = value;

}}public int ProductID{

get{return this.productID;}

set{this.productID = value;}

}public decimal UnitPrice{

get{return this.unitPrice;}

set{this.unitPrice = value;}

}public int QuantityOrdered{

get{return this.quantityOrdered;}

set{this.quantityOrdered = value;}

}

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public float Discount{

get{return this.discount;

}set{this.discount = value;

}}}}

This concludes the test, data, and business classes You should be able to successfullybuild and test the entire solution Once you have resolved any build or test issues, you are

ready to move on to the web layer

Add Button to Check Out the Shopping Cart Contents Task

The first web layer task is to add a button to the DisplayShoppingCart.aspx so that users

can start the process of placing their order Listing 15-12 shows the updated

<%@ Register TagPrefix="Categories" TagName="LeftNav" Src="Categories.ascx" %>

<%@ Register TagPrefix="TopNav" TagName="TopNav" Src="TopNav.ascx" %>

<%@ Page language="c#" CodeFile="DisplayShoppingCart.aspx.cs"

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<Categories:LeftNav id="leftnav" runat="server" />

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This will take the user to the CheckOutConfirmation.aspx page.

Create Checkout Confirmation Page Task

Now that the DisplayShoppingCart.aspx page allows the user to check out, you need to build

the confirmation page called CheckoutConfirmation.aspx, as shown in Listing 15-13

Listing 15-13.CheckoutConfirmation.aspx File

<%@ Import Namespace="BusinessLayer" %>

<%@ Import Namespace="DataLayer" %>

<%@ Import Namespace="System.Collections" %>

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Display Shopping Cart Contents in Checkout Confirmation Page Task

You will need to retrieve the shopping cart that you have been building and display its tents To do that, enhance CheckoutConfirmation.aspx as shown in Listing 15-14

con-Listing 15-14.Modified CheckoutConfirmation.aspx to Show Shopping Cart Contents

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LineItem lineItem = (LineItem)cartEnumerator.Value;

Product product = lineItem.Item;

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shop-Listing 15-15.Modified CheckoutConfirmation.aspx.cs to Get the Shopping Cart

protected ShoppingCart cart = null;

protected IDictionaryEnumerator cartEnumerator = null;

protected void Page_Load(object sender, System.EventArgs e){

if ( Session["cart"] != null ){

cart = (ShoppingCart)Session["cart"];

}else{cart = new ShoppingCart();

cart.Quantity = 0;

Session["cart"] = cart;

}cartEnumerator = cart.GetCartContents();

}}

Now when the users go to this page, if they have any items in their shopping cart, thoseitems will be displayed But this isn’t much different from the DisplayShoppingCart.aspx page

So, next you will subtotal the dollar amounts of all the items displayed

Subtotal Shopping Cart Line Items and Display Results Task

To get the subtotal, you need to first enhance CheckoutConfirmation.aspx to display the tal, as shown in Listing 15-16

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subto-Listing 15-16.Modified CheckoutConfirmation.aspx to Show the Subtotal

Response.Write("<tr><td>" + product.ProductName + "</td><td>"

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+ product.Price.ToString("C") + "</td><td align=\"center\">"+ lineItem.Quantity.ToString() + "</td></tr>");

total += product.Price * lineItem.Quantity;

protected decimal total = 0;

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cart.Quantity = 0;

}}}

Now you can display the subtotal Next, you need to add a button to cancel checking out

in case users change their mind

Add Button to Cancel the Checkout Task

For the next task, you will add a button to CheckoutConfirmation.aspx that will allow users to

exit the checkout process and return to their shopping experience Listing 15-18 shows the

enhanced CheckoutConfirmation.aspx page

Listing 15-18.CheckoutConfirmation.aspx with a Cancel Button

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Response.Write("<tr><td>" + product.ProductName + "</td><td>"+ product.Price.ToString("C") + "</td><td align=\"center\">"+ lineItem.Quantity.ToString() + "</td></tr>");

total += product.Price * lineItem.Quantity;

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<asp:Button ID="CancelButton" runat="server" Text="Cancel"></asp:Button>

cart.Quantity = 0;

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}protected void CancelButton_Click(Object sender, System.EventArgs e){

Response.Redirect("DisplayShoppingCart.aspx", true);

}}}

Add Button to Process Order Request Task

The last task is to add a button to CheckoutConfirmation.aspx that will act as acceptance of theuser’s intention to check out and process the order First, you will add the button to the page,

</td>

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<asp:Button id="CompleteOrderButton" runat="server"

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Then you will enhance the CheckoutConfirmation.aspx.cs class with a method to handlethe Complete Order button click, as shown in Listing 15-21.

Listing 15-21.CheckoutConfirmation.aspx.cs with an Order Completion Method

private void Page_Load(object sender, System.EventArgs e){

cart.Quantity = 0;

}protected void CompleteOrderButton_Click(Object sender, System.EventArgs e){

// Get the current customerUser user = (User)Session["User"];

Customer customer = CustomerData.FindCustomerByUserName(user.UserName);

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// Create the new Orderint orderID = OrderData.InsertOrder(customer);

// Do order completion stuff and redirect to OrderConfirmation pagecart = (ShoppingCart)Session["cart"];

cartEnumerator = cart.GetCartContents();

while (cartEnumerator.MoveNext()){

OrderDetailData.InsertLineItem(orderID, lineItem);

lineItem.Item.Quantity -= lineItem.Quantity;

ProductData.UpdateQuantity(lineItem.Item);

}// Empty the cartSession["cart"] = null;

Response.Redirect("OrderConfirmation.aspx?orderID=" + orderID, true);

}protected void CancelButton_Click(object sender, System.EventArgs e){

Response.Redirect("DisplayShoppingCart.aspx", true);

}}}

The User class in the BusinessLayer will need to be updated This class should look likeListing 15-22

Listing 15-22.Updated User.cs File

private string userName;

private string password;

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public User(){

}public User(string userName, string password){

this.userName = userName;

this.password = password;

}public string UserName{

get{return this.userName;

}set{this.userName = value;

}}public string Password{

get{return this.password;

}set{this.password = value;

}}}}

In addition, the ProductData class in the DataLayer will need to updated, as shown in Listing 15-23

Listing 15-23.Updated ProductData.cs File

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}public static ArrayList GetProductsByCategory(int categoryID){

ArrayList products = new ArrayList();

try{OdbcConnection dataConnection = new OdbcConnection();

Product product = new Product();

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}catch(Exception e){

Console.WriteLine("Error: " + e.Message);

}return products;

}public static Product GetProduct(int ProductID){

Product product = null;

dataConnection.ConnectionString = DataUtilities.ConnectionString;dataConnection.Open();

// Build command stringStringBuilder commandText =new StringBuilder("SELECT * FROM Products WHERE ProductID = ");commandText.Append(productID);

dataCommand.CommandText = commandText.ToString();

OdbcDataReader dataReader = dataCommand.ExecuteReader();

if (dataReader.Read()){

product = new Product();

}catch (Exception e){

}

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return product;

}public static ArrayList SearchForProducts(string searchString){

ArrayList products = new ArrayList();

product = new Product();

}catch (Exception e){

}return products;

}

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public static void UpdateQuantity(Product product){

Console.WriteLine(e.Message);

}}}}

This should complete all the tasks for the Display Checkout Confirmation user story Butremember that a story is not complete until the customer says so That is where the accept-ance test for this user story comes into play

Acceptance Testing

The acceptance test for a story is defined by the customer and automated (if possible) by theacceptance tester Our customer defined the acceptance test for the Display Checkout Confir-mation user story as follows:

• Click a Checkout button on the Display Shopping Cart page to check out

• Display a Checkout Confirmation page that lists all the items currently in the shoppingcart

• See a subtotal dollar amount of the order

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• When a Continue button is clicked on the Checkout Confirmation page, the ordershould be built and handed off for processing.

• A Cancel button should also be displayed on the Checkout Confirmation page Whenclicked, that button should take the user back to the Display Shopping Cart page

Developing the Remaining User Stories

This iteration has four other user stories As in the first iteration, they are being developed in

parallel with the Display Checkout Confirmation user story, which we focused on here Each

user story has its own acceptance tests written by the customer and automated by the

accept-ance testers, where possible

The developers switch pairs at least once a day They take a test-driven approach with theremaining user stories, just as with the user story described in this chapter

All the developers keep track of the time they spend on the tasks that they picked for thisiteration When the tracker comes around (at least twice a week), the developers report the

actual time they have spent on their tasks

You can download the source code for this iteration from the Source Code area of theApress website (www.apress.com)

Coach’s Journal

During this iteration, I noticed that the team is getting better at pairing The pairs were better

at switching who was on the keyboard and who was not I also saw that the team members are

getting more acclimated to their environment, and that overall communication is starting to

occur more frequently and openly

Also, the acceptance testers are getting more comfortable with testing early rather thanlater The acceptance testers were extremely helpful in working with the customer to define

the acceptance tests and determining what could be automated

As in the last iteration, I spoke with our customer frequently to make sure that he wascomfortable with what was going on during the iteration When our customer had concerns or

questions, I addressed them immediately This iteration, our customer became keenly aware

of a need for securing the website during the ordering process I sat down with him, and we

discussed several options that he had in this area I can see that he is already thinking about

security stories for the next release

Summary

By now, you should be getting a feel for the XP process You have seen how to take a

test-driven development approach to coding You have witnessed how an iterative approach can

provide a lot of feedback in the form of unit and acceptance tests Daily stand-ups and the

graphs and charts generated by the tracker create a better environment for communication

All of this communication allows the team members to better gauge where they are at meeting

their targets

You are well on your way down the XP path

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