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

Fluent mapping


While XML mapping is undoubtedly the most common mapping method, the fluent NHibernate method is gaining steam. This is a separate project from the main NHibernate project, and you can find out more information about it at http://fluentnhibernate.org/.

Some of the advantages of fluent mapping over XML mapping are as follows:

  • Compile-time mapping validation: XML is not evaluated by the compiler, so renaming properties in your classes or other errors in your hbm.xml mapping would not be detected until you actually run the application

  • Less verbose: XML by nature is fairly easy to read because of the number of characters it requires to produce even simple documents, but this makes for huge documents

  • Fewer repetitions: Instead of writing the same repetitive XML over and over, the fluent interface exposes the advantages of native code

Fluent NHibernate provides these advantages by moving your mappings from XML documents directly into your code. They're compiled along with your application...