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The client application may need to display a complete list of items selected by a user in their shopping cart. This is accomplished with the help of the GetCart() web method, shown in Listing B-7. Listing B-7. Retrieving Shopping Cart Items [WebMethod] public DataSet GetCart(string cartid) { string sql = "SELECT * FROM shoppingcart c,products p WHERE c.productid=p.id AND c.cartid=@cartid"; SqlParameter[] p = new SqlParameter[1]; p[0] = new SqlParameter("@cartid", cartid); DataSet ds = SqlHelper.GetDataSet(sql, p); return ds; } The GetCart() web method accepts the shopping cart identifier and returns all the items from that cart to the caller in the form of a DataSet. Notice that the SELECT query is based on two tables ShoppingCart and Products because the product name and unit price also need to be sent back to the client application.

As we noted at the beginning of the chapter, we focused on the activities of the developers during the first iteration. Now we will take a quick look at what the other team members have been doing.

One of the many interesting features NetBeans provides is the ability to debug Ant files. Much in the same way you can debug Java source files, you can step through a build file line by line. You can set a breakpoint in a build file, just as in a regular source code file: by clicking the line number in the glyph margin, as shown in Figure 14-5. You can then activate the debugging session for the target by right-clicking the build.xml file, selecting Debug Target, and choosing run from the submenu. This will trigger a debugging session for the run target and allow you to step through the build file.

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Often shopping cart web pages need to display the total amount of the cart. This is achieved by a web method named GetCartAmount(), shown in Listing B-8. Listing B-8. Retrieving the Cart Amount [WebMethod] public decimal GetCartAmount(string cartid) { string sql1 = "SELECT SUM(c.Qty * p.UnitPrice) AS Total FROM Products AS p INNER JOIN ShoppingCart AS c ON p.Id = c.ProductID WHERE c.CartID = @cartid"; SqlParameter[] p1 = new SqlParameter[1]; p1[0] = new SqlParameter("@cartid", cartid); object obj = SqlHelper.ExecuteScalar(sql1, p1); if (obj != DBNull.Value) { decimal amount = (decimal)obj; return amount; } else { return 0; } } The GetCartAmount() web method accepts a unique cart identifier and returns the total amount for that cart. Inside it executes a SUM() aggregate query. If the query returns NULL, a value of 0 is returned to the caller. Otherwise, the actual cart total is returned as a decimal value.

Figure 14-5. Setting a breakpoint in an Ant build file Since Ant is so tightly integrated with NetBeans, you can access full debugging information using the IDE tools. For example, you can open the Local Variables window by selecting Window Debugging Local Variables or using the shortcut Alt+Shift+1. As shown in Figure 14-6, a variety of variables are available during the debugging session. As you step through the build file, you can watch the values of those variables. This can be very useful if you need help debugging sporadic errors that occur while building your project code.

When an order is placed, the Orders table should have an entry for that order. Moreover, all the items from the shopping cart must be moved to the OrderDetails table. This is accomplished with the help of the PlaceOrder() web method, shown in Listing B-9. Listing B-9. Placing an Order [WebMethod] public int PlaceOrder(string cartid,string street,string city,string state, string country,string postalcode) { string sql1 = "SELECT SUM(c.Qty * p.UnitPrice) AS Total FROM Products AS p INNER JOIN ShoppingCart AS c ON p.Id = c.ProductID WHERE c.CartID = @cartid";

Everyone on the team journaled at the end of each day. This information will be used later after the release to review what worked well and what didn t. This helps the team decide how and if they need to tailor XP for their purposes and why.

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