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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.

public void processAction(ActionRequest request, ActionResponse response) throws PortletException, IOException { //increase the portlet's size response.setWindowState(WindowState.MAXIMIZED); //pass the query to the render method response.setRenderParameter("query", request.getParameter("query")); }

17. Running the application will now give you the data neatly separated within the list (see Figure 8-25).

We used Iskandar Salim s Lucene JSP tag library to display our results. You can download the tag library from its web page, www.javaxp.net/lucene-taglib. The Lucene tag library has an Apache Software Foundation 2.0 open source license. To use the tag library in this example, add the TLD definition file to the /tld directory under your WEB-INF folder, and add the taglibs-lucene.jar file to your WEB-INF/lib directory. There are three tags in the JSP tag library: <search>, <index>, and <field>. We are only going to use the <search> tag. The <search> tag provides us with an easy way to pass a query to an index. We defined the path to the index as a request attribute, so we retrieve it in the scriptlet at the top of the page. The JSP tag takes the name of the field to search as an attribute: field="contents". The <search> tag also takes an attribute for the analyzer, analyzer="standard", for the StandardAnalyzer class. The var attribute names the variable that holds the Hits object. The startRow and maxRow attributes

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.

10

Now, the designer is likely to want to have some kind of UI glitz happening. For this example, we will make the list box fade in from invisible as it slides in from the left-hand side. This is achieved using animation timelines. First you will want to create the trigger that fires when the button is clicked. You do this by selecting the button in the Objects and Timeline pane, and then the + Event Trigger button in the Triggers pane. The IDE will create the default trigger, which is Window.Loaded. Don t worry! Underneath the Window.Loaded entry in the Triggers window, you will see the trigger definition section it reads When Window Loaded is raised, with Window and Loaded as drop-downs (see Figure 8-26).

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";