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

Normal Form


You may have heard the term Third Normal Form (3NF) when talking about databases and wondered what it meant. Quite simply, Normalization is a way to construct databases to standardize their appearance and to reduce duplication of data. Of the six normal forms (1st-5th and Boyce-Codd Normal Form or BCNF, another name for 3NF), 3NF is the most widely discussed, but First Normal Form (1NF) is the one we are most concerned with.

To be 1NF compliant, we need to eliminate duplicative columns from the same table, and create separate tables for each group of related data and identify each row with a unique column or set of columns (the Primary Key). In other words, we don't want to store duplicate data, we want to store it once and relate to it.

Essentially a 3NF database will store data in multiple tables to normalize the data and reduce duplication as we talked about earlier, and additionally:

  • Functional dependencies on non-key fields are eliminated by putting them in a separate table...