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Even though the ASP.NET MVC Framework is focused on the presentation layer, many developers work on small applications that don t need several layers of business logic and separation between the presentation layer and the data store. For these small applications, simple separation patterns may be appropriate, but many small applications grow much larger than originally anticipated. When this happens, separation of concerns is critical to the long-term maintainability of the software. To achieve separation of concerns when communicating with a relational database, we can use an object-relational mapping tool such as the popular open source NHibernate project. NHibernate makes data access with relational databases trivial. As with anything new, a learning curve is associated with understanding the method of configuring the mapping between objects and tables. This chapter demonstrates

If you create an application that is going to be run on multiple platforms, it can be quite a chore to deal with environment-dependent values such as the user s home directory or the host name. Table 6-4 offers a short list of functions that return important environment variables.

how to configure and leverage NHibernate when developing an application whose UI takes advantage of the ASP.NET MVC Framework. This example is equally applicable in ASP.NET MVC 1 and 2.

Retrieving the values stored in a tree model row is very similar to adding a row. In Listing 8-6, gtk_tree_model_get_iter_from_string() is first used to retrieve a tree iterator that points to the first row in the tree view. This corresponds to the first category. Next, gtk_tree_model_iter_next() is used to loop through all of the root-level rows. For each root-level row, the following code is run. First, the product name is retrieved with gtk_tree_model_get(). This function works like gtk_tree_store_set(), which accepts a GtkTreeModel, an iterator pointing to a row, and a list of pairs of column numbers and variables to store the data. This list should be terminated with -1 and the returned value freed by the programmer. gtk_tree_model_get (model, &iter, PRODUCT, &name, -1); if (g_ascii_strcasecmp (name, category) == 0) break; Then g_ascii_strcasecmp() is used to compare the current product to the chosen category name. If the two strings match, the loop is exited, because the correct category was found. The iter variable now points to the selected category.

What if the password were truly random, such that the probability that a given bit of the password is either 0 or 1 is exactly 1/2 (as might be the case for a cryptographic key) In that case, the password would contain more entropy than the surrounding object code! Object code is typically made up of regular patterns, and anything that does not fit that pattern could be considered to be a candidate password by the attacker Finally, if you were to choose something less random as a password (say, something that looks like object code itself), the attacker would simply have to brute-force a relatively small dictionary of bytecodes As a result, storing any sort of a password or key in your source code is a bad idea, as it will get compiled into the binary, and can be fairly easily reverse-engineered out of the binary..

The example we ll explore in this chapter builds on the ASP.NET MVC 2 default project template that we get when creating a new project through Visual Studio. The functionality that s added is the capability for each page to track visitors to the site. The site tracks the following pieces of data:

Adding new rows to the tree model is done in the same way as they were originally added during startup. In the following code, the GtkTreeIter that points to the chosen category is first converted into a tree path, since it will become invalidated when the tree store is changed. Note that it does not have to be converted to a tree row reference, because its location will not possibly change. path = gtk_tree_model_get_path (model, &iter); gtk_tree_store_append (GTK_TREE_STORE (model), &child, &iter); gtk_tree_store_set (GTK_TREE_STORE (model), &child, BUY_IT, buy, QUANTITY, quantity, PRODUCT, product, -1); Next, a new row is appended with gtk_tree_store_append(), where iter is the parent row. That row is populated with gtk_tree_store_set(), using the data entered by the user in the dialog.

Figure 23.1 shows that when we run the application the most recent visits are displayed at the bottom of the page. Each page displays its recent visits.