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Now that we have a session factory and we have a session, our application can call NHibernate and communicate with the database. Aside from the NHibernate initialization, we have the initialization of the VisitorRepositoryFactory. Many applications use IoC tools, which provide these factories automatically; but because this example doesn t leverage an IoC container, we had to provide this startup logic explicitly. There are several ways to do that; for example, we could declare an interface for the factory and keep an implementation around. Use your judgment when choosing a technique. The important thing is that neither the Core project nor the UI project should reference the Infrastructure project or libraries that are purely infrastructural in nature. We ve kept NHibernate completely off to the side so that the rest of the application doesn t care how the data access is happening. There s one final missing piece required before we can run this application from Visual Studio using Ctrl-F5. The Web.config file refers to a class in the Infrastructure project, but because there s no reference, the Infrastructure assembly won t be in the bin folder of the website. We could copy it explicitly every time we compile, but that would get tiresome. The solution is to have Visual Studio copy it every time it s compiled by adding the lines in listing 23.16 to the Infrastructure.csproj file as a postbuild event.

class Test { public static void Main() { DataRow row = new DataRow(); row.Load(); Console.WriteLine("Column 0: {0}", row[1].Data); row[1].Data = 12; // set the ID } } The DataRow class has functions to load a row of data, has functions to save the data, and has an indexer function to provide access to the data. In a real class, the Load() function would load data from a database. You write the indexer function the same way you write a property, except the indexer function takes an indexing parameter. You declare the indexer using the name this since it has no name.

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module still needs the code to invoke the logging API. The overall effect is an undesired tangling between all the modules needing logging and the logging module itself. Each coupling is represented in the figure by a gray arrow. , This is where AOP comes into the picture. Using AOP none of the core modules will contain calls to logging services they don t even need to be aware of the presence of logging in the system. Figure 1.6 shows the AOP implementation of the same logging functionality shown in figure 1.5. The logging logic now resides inside the logging module and logging aspect; clients no longer contain any code for logging. The crosscutting logging requirements are now mapped directly to just one module the logging aspect. With such modularization, any changes to the crosscutting logging requirements affect only the logging aspect, isolating the clients completely. For now, don t worry about the way in which AOP achieves this. That will be explained in section 1.6. Modularizing crosscutting concerns is so important that there are several techniques to achieve it. For example, the Enterprise JavaBeans (EJB) architecture simplifies creating distributed, server-side applications, and handles the

Sometimes, I ll need to share a little bit of information that, although nice, isn t essential to your understanding of the shell. I ll put that information into an Above and beyond section, like this one. If you skip these, you ll be fine; if you read them, you ll often learn about an alternative way to do something, or get a bit of additional insight into PowerShell.

Figure 6 16. Exporting the constructor function from a self-invoking function expression The previous sample could be reworked to use locally defined _bittersweet, _cocoa, and _vanilla variables rather than _bittersweet, _cocoa, and _vanilla named parameters. Try it, verifying your work with Figure 6 17. var ChocolateChocolate = null; (function () { var _bittersweet = "Ghirardelli", _cocoa = "Callebaut", _vanilla = "Madagascar Bourbon"; ChocolateChocolate = function (bittersweet, cocoa, vanilla) { this.bittersweet = [1, "cup", bittersweet || _bittersweet]; this.cocoa = [3, "tbs", cocoa || _cocoa]; this.vanilla = [1, "bean", vanilla || _vanilla]; }; }()); ChocolateChocolate.prototype = { heavyCream: [1, "cup", "Organic Valley"], halfHalf: [1, "cup", "Organic Valley"], sugar: [5/8, "cup"], yolks: [6] }; var chocolateChocolate = new ChocolateChocolate("Lindt"); console.dir(chocolateChocolate); ChocolateChocolate.toString();

The Java language has eight primitive types (boolean, char, byte, short, int, long, float, and double), each with its corresponding wrapper class (Boolean, Char, Byte, Short, Integer, Long, Float, and Double). While iBATIS does not allow you to get a primitive result directly, it does allow you to get wrapped primitive results. For example, if you want a count of orders for a customer, you can do it as an Integer, but not as a primitive int, as the next example shows:

In earlier versions of C# iterators, both lambda expressions and delegates were used to express queries and interact with enumerator methods. Using lambda expressions, the selection would be expressed like this:

longer accessible by any code. Any destructors for inherited classes are invoked at this time as well. A destructor is declared as follows:

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