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As covered before, controllers are the part of the MVC architecture that receives requests from users, manipulates models (optionally), and then returns views back to clients. The Main Controller The vanilla Ramaze app comes with a single controller in controller/main.rb: # Default url mappings are: # a controller called Main is mapped on the root of the site: / # a controller called Something is mapped on: /something # If you want to override this, add a line like this inside the class # map '/otherurl' # this will force the controller to be mounted on: /otherurl class MainController < Controller # the index action is called automatically when no other action is specified def index @title = "Welcome to Ramaze!" end # the string returned at the end of the function is used as the html body # if there is no template for the action. if there is a template, the string # is silently ignored def notemplate "there is no 'notemplate.xhtml' associated with this action" end end This main controller, in the MainController class, is special to Ramaze in only one way: it s automatically mapped to the root URL (/). The comments explain, however, that if you want to map it somewhere else, you can use the map class method followed by the base URL you want to associate it with. For example, to access MainController s methods through http:// localhost:7000/otherurl/[method name]: map '/otherurl' The main controller also demonstrates that you can create methods within controllers that have no associated templates (in the views/ folder), but that return strings that will be directed rendered within the default layout. If you read the Sinatra section of this chapter, this technique should seem familiar!

1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the shopping_cart_empty function in your hatshop database: -- Create shopping_cart_empty function CREATE FUNCTION shopping_cart_empty(CHAR(32)) RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; BEGIN DELETE FROM shopping_cart WHERE cart_id = inCartId; END; $$; When a customer places an order, shopping_cart_create_order will call shopping_cart_empty to delete the products from the customer s shopping cart. 4. Use the query tool to execute this code, which creates the shopping_cart_create_order function in your hatshop database: -- Create shopping_cart_create_order function CREATE FUNCTION shopping_cart_create_order(CHAR(32)) RETURNS INTEGER LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; outOrderId INTEGER; cartItem cart_product; orderTotalAmount NUMERIC(10, 2); BEGIN -- Insert a new record into orders INSERT INTO orders (created_on) VALUES (NOW()); -- Obtain the new Order ID SELECT INTO outOrderId currval('orders_order_id_seq'); orderTotalAmount := 0; -- Insert order details in order_detail table FOR cartItem IN SELECT p.product_id, p.name, COALESCE(NULLIF(p.discounted_price, 0), p.price) AS price, sc.quantity, COALESCE(NULLIF(p.discounted_price, 0), p.price) * sc.quantity AS subtotal

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To install WSUS 3.0 on a computer running Windows Server 2008, you must configure the following installation prerequisites:

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Canvas[] cI = new Canvas[16]; Image[] i = new Image[16]; int[] board = new int[16];

Sample of Visual Basic Code Protected Sub ShipButton_Click_ (ByVal sender As Object, ByVal e As System.EventArgs) _ Handles ShipButton.Click If (ShippingTypeRadioButtonList.SelectedValue = [String].Empty) OrElse _ (DestinationsCheckBoxList.SelectedValue = [String].Empty) Then ShippingConfirmationLabel.Text = "You must select a shipping type and at least one destination." Else ShippingConfirmationLabel.Text = _ String.Format("Using {0} shipping to:<br>", _ ShippingTypeRadioButtonList.SelectedValue) For Each li As ListItem In DestinationsCheckBoxList.Items If li.Selected Then ShippingConfirmationLabel.Text += li.Value + "<br>" End If Next End If End Sub

In addition to these methods, String offers many static and instance methods that manipulate a string, such as Insert, Remove, PadLeft, Replace, Split, Join, ToLower, ToUpper, Trim, Concat, Format, and so on. Again, the important thing to remember about all these methods is that they return new string objects; because strings are immutable, once they re created, they can t be modified in any way.

Because these les have come from source control they will be read-only, so rather than relying on the AssemblyInfo task to overwrite them we remove the read-only attribute using the Attrib task (also from the MSBuild Community Tasks).

Sequences can be created, changed, and dropped with the following three SQL commands: CREATE SEQUENCE ALTER SEQUENCE DROP SEQUENCE

Overriding the HttpApplication to include your own state and event handling is a matter of adding a global application object to your site If you ask Microsoft Visual Studio to create a normal Web site for you (that is, click File, New, Website, ASP NET Web Site in Visual Studio), Visual Studio throws a singular global asax file into your project Global asax includes a server-side script block to hold any code you want to add to the application object If you ask Visual Studio to create an ASP NET Web Application Project (that is, click File, New Project, ASP NET Web Application in Visual Studio), Visual Studio adds a pair of files, Global asax and Global asax cs, to your application Global asax and Global asax cs have the same relationship to each other as an ASPX file and its accompanying CS file have .

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