Book Image

NHibernate 2 Beginner's Guide

By : Aaron Cure
Book Image

NHibernate 2 Beginner's Guide

By: Aaron Cure

Overview of this book

<p>NHibernate is an open source object-relational mapper, or simply put, a way to retrieve data from your database into standard .NET objects. Quite often we spend hours designing the database, only to go back and re-design a mechanism to access that data and then optimize that mechanism. This book will save you time on your project, providing all the information along with concrete examples about the use and optimization of NHibernate.<br /><br />This book is an approachable, detailed introduction to the NHibernate object-relational mapper and how to integrate it with your .NET projects. If you're tired of writing stored procedures or maintaining inline SQL, this is the book for you.<br /><br />Connecting to a database to retrieve data is a major part of nearly every project, from websites to desktop applications to distributed applications. Using the techniques presented in this book, you can access data in your own database with little or no code.<br /><br />This book covers the use of NHibernate from a first glance at retrieving data and developing access layers to more advanced topics such as optimization and Security and Membership providers. It will show you how to connect to multiple databases and speed up your web applications using strong caching tools. We also discuss the use of third-party tools for code generation and other tricks to make your development smoother, quicker, and more effective.</p>
Table of Contents (19 chapters)
NHibernate 2
Credits
About the Author
About the Reviewers
Preface
Index

The basic Data Access Object


In order for our Data Access Objects to be effective for our use, they need to contain a few basic methods. In general, our DAOs will be responsible for all of the CRUD (Create, Retrieve, Update, and Delete) operations, so we will need to create methods to handle those operations.

We should add a local ISession variable called Session to allow easy access from our class. This gives us a single place to update in our class, should we decide to change the way we are handling sessions.

private ISession Session
{
  get { return SessionFactory.OpenSession(); }
}

The VB.NET code looks almost the same:

Private ReadOnly Property Session() As ISession
  Get
    Return SessionFactory.OpenSession()
  End Get
End Property

In order to make the interaction with our Data Access Object feel more natural to use, we need to do one more thing—add a Singleton object. Basically, we will create a property, called Instance, that will allow us to call the methods on our Data Access Object...