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NHibernate in action with a Hello World application How to architecture an NHibernate application Writing and mapping a simple entity Configuring NHibernate Implementing primitive CRUD operations
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It s good to understand the need for object/relational mapping in .NET applications, but you re probably eager to see NHibernate in action. We start by showing you a simple example that demonstrates some of its power. As you re probably aware, it s traditional for a programming book to start with a Hello World example. In this chapter, we follow that tradition by introducing NHibernate with a relatively simple Hello World program. But printing a message to a console window won t be enough to really demonstrate NHibernate. Instead, your program will store newly created objects in the database, update them, and perform queries to retrieve them from the database. This chapter forms the basis for the subsequent chapters. In addition to the canonical Hello World example, we introduce the core NHibernate APIs and explain how to configure NHibernate in various runtime environments, such as ASP.NET applications and standalone WinForms applications.
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NHibernate applications define persistent classes that are mapped to database tables.
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Our Hello World example consists of one class and one mapping file. Let s see what a simple persistent class looks like, how the mapping is specified, and some of the things you can do with instances of the persistent class using NHibernate.
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Before you can start coding the Hello World application, you must first install NHibernate. You then need to create a new Visual Studio solution to contain the sample application. NHibernate 1.2.1GA can be downloaded via http://www.nhforge.org. Click the download tab and locate NHibernate Core. From there you can find and download the NHibernate 1.2.1.GA.msi file. Although the book is written for NHibernate 1.2.1GA, we re aware that many people are using NHibernate 2.0 Beta. We ve therefore ensured our first tutorial applies to both of these versions of NHibernate. Once you ve downloaded and installed NHibernate, you re ready to create a new solution and start using it.
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For the example application, you should create a new blank project with Visual Studio. This is a simple application, so the easiest thing to create is a C# Console Application. Name your project HelloNHibernate. Note that you can also use NHibernate with VB.NET projects, but in this book, we ve chosen to use C# examples. The application will need to use the NHibernate library, so the next step is to reference it in your new project. To do this, follow these steps:
Right-click the project and select Add Reference. Click the Browse tab and navigate to the folder where NHibernate is installed. By default, NHibernate resides in the C:\Program Files\NHibernate\bin\net2.0\ folder. From the list of assemblies, select NHibernate.dll. Click OK to add this reference to your solution. By default, the Console Application should have added a file called Program.cs to your solution. Locate this file and open it. Note that, in console applications, this will be the first thing that is run when you execute the program. Reference the NHibernate library at the top of the Program.cs file with the using NHibernate, using System.Reflection and NHibernate.Cfg statements, as follows:
System; System.Reflection; NHibernate; NHibernate.Cfg;
using using using using
Hello NHibernate!
namespace HelloNHibernate { public class Program { static void Main() { } } }
Now that your solution is set up, you re ready to start writing your first NHibernate application.
Creating the Employee class
The objective of the sample application is to store an Employee record in a database and to later retrieve it for display. The application needs a simple persistent class, Employee, which represents a person who is employed by a company. In Visual Studio, add a new class file to your application and name it Employee.cs when prompted. Then enter the code from listing 2.1 for the Employee entity.
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