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

Creating objects


We will be interacting with our classes the entire time we are programming, so spending a little extra time up front is an investment that will pay dividends almost immediately. As long as we remember a few simple concepts, we will be able to make very quick work of creating these classes. (For an even quicker way to create them, sneak a peek at Chapter 11, It's a Generation Thing, about Code Generation!)

One of the first things we will need for our new classes is a constructor. Constructors are used to "new up" an object. You have probably seen or written syntax similar to the following example:

OrderHeader header = new OrderHeader();

Or in VB.NET:

Dim header As OrderHeader = New OrderHeader()

In this example, we are creating a new OrderHeader object. This object represents the OrderHeader table we created in our database. To create this new object, we need a constructor (in this case the "default" constructor). Our default constructor is simply a method with no return object...