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If a user makes a query for past orders of pizzas with onions, submitting the form would result in an HTTP request for the URL: https://www.deliver-me-pizza.com/show_orders_by_topping topping=Onions which in turn results in the following SQL query to be constructed and executed: SELECT pizza, toppings, quantity, order_day FROM orders WHERE userid=4123 AND toppings LIKE '%Onions%' The LIKE operator specifies a textual match, with the % character used as a wildcard character (i.e., the condition matches all rows in which the toppings column contains the string Onions as a substring). Since the parameter topping is used in a context inside a quoted string, the attacker needs to inject additional single-quote characters to ensure that the resulting SQL statement after injection is syntactically correct. However, doing so is not difficult. For example, he could simply set the parameter topping to the following: brzfg%'; DROP table creditcards; -The resulting SQL statement after injection then becomes SELECT pizza, toppings, quantity, order_day FROM orders WHERE userid=4123 AND toppings LIKE '%brzfg%'; DROP table creditcards; --%' Here, the attacker has arranged for the SELECT clause to return an empty set by querying for a string that does not occur in the database (this isn t actually important in this particular attack, but might be necessary in a SELECT UNION attack). Furthermore, he has injected the SQL comment delimiter -- to prevent the % and ' characters at the end of the query from resulting in a syntax error. The other attacks introduced in this section (such as using SELECT UNION to retrieve data from other tables) can be adapted accordingly.

This will render a link that displays the text Click here. When the user clicks the link, the GetMessage action will be invoked via Ajax. The response from this action (probably an HTML fragment) will be placed in an element with ID message_container. The available parameters you can pass to the AjaxOptions class to customize the behavior of the link are listed in table 12.1.

The pop-up menu was shown and is available for editing. All of the text in the document was selected or deselected. An anchor was added to the text view. The adjustments of the text view were set. The overwrite key was toggled on or off.

Table 12.1 Ajax options for the AjaxOptions class Description Specifies the HTTP method, which can be GET or POST. The default is GET. Specifies the element that will receive the content. Sets the insertion mode, which can be InsertBefore, InsertAfter, or Replace. Specifies the JavaScript function to be called before invoking the action. Specifies the JavaScript function to be called after the response comes back. Specifies the JavaScript function to be called in the event of an error. Specifies the JavaScript function to be called if no errors occur. Sets the confirmation message to be displayed in an OK/Cancel dialog box before proceeding. Specifies the URL to use if the anchor tag has a different destination than the Ajax request. Specifies an element that displays Ajax progress. The element should be marked as visibility:hidden initially.

There are a variety of techniques that can be used together to prevent SQL injection. We recommend using them in combination as part of a defense-in-depth approach to preventing SQL injection attacks.

The state of the toggle was changed. You should connect to this signal if you want to take some type of action when the toggle is activated or deactivated.

Representing UI concepts in code Defining the presentation model Representing user input Scaling to complex scenarios

This signal is used internally by GTK+ to move to the first or last element in the toolbar and cannot be used in application code. The callback function returns TRUE if the signal was handled. This signal is used internally by GTK+ to move the focused item and cannot be used in application code. The orientation of the toolbar was changed to horizontal or vertical.

A model is a representation of something meaningful. It s not necessarily something physical but something real: a business concept or an API that s difficult to work with. When we write object-oriented software, we create classes that make up this representation. We can create our representation so that when we use it we re working in a natural human language, like English or Spanish or business jargon, instead of in programming language constructs like Booleans, meaningless strings, and integers. When working with a user interface (UI) framework like ASP.NET MVC, the UI is the complex problem that we manage. It s the data in a window, a form submission from a user, the options in a select list. Whereas model is an overloaded term in software, this chapter focuses on the presentation model the model that represents the screen and user input of an application.

At first thought, and especially based on the preceding example, it may seem that one might be able to prevent SQL injection attacks by eliminating quote characters found in user input. However, this approach is not sufficient, and you should not solely use this approach in your code we illustrate why shortly.

The user right-clicked the toolbar or pressed a key binding that causes a pop-up menu to be displayed. You can use this to display a custom context menu for the toolbar. You should return TRUE if the signal was handled. The style of the toolbar was changed.