Book Image

NHibernate 3 Beginner's Guide

By : Dr. Gabriel Nicolas Schenker, Aaron Cure
Book Image

NHibernate 3 Beginner's Guide

By: Dr. Gabriel Nicolas Schenker, Aaron Cure

Overview of this book

<p>Ideally, we would want to persist the objects our application uses and produces AS IS, without having to first transform them in complex ways. NHibernate is a framework that provides us with an object-oriented access to a relational database without having to write SQL and with little or no database-specific data access code. Definitely, if you are a .NET developer, knowing more about NHibernate will simplify and reduce your efforts in developing .Net applications.<em>NHibernate 3 Beginner's Guide</em> introduces Nhibernate with step-by-step examples, and is the easiest way to learn about bridging the gap between object-oriented .NET applications and the relational database that stores the application's data. It is a beginner's guide to NHibernate that starts from scratch. Successive chapters build upon earlier concepts, while the sample code presents various ways to accomplish typical data access tasks.</p> <p><em>NHibernate 3 Beginner's Guide</em> examines all of the topics required to get a functional data access layer implemented while writing the least amount of code possible, presenting options along the way to handle particular edge cases or situations as they arise. The book begins with an introduction to NHIbernate 3 and then moves on to creating the development environment. Then it teaches you how to create a model, define a database schema, and map the model to the database then covers sessions and transactions. This is succeeded by testing, profiling, and configuration, validation of data and writing queries. Finally, we wrap up with notes on the common pitfalls that you should avoid.</p> <p>Once you complete reading the book, you will have gained the skills and knowledge to incorporate NHibernate into your own applications.</p>
Table of Contents (19 chapters)
NHibernate 3 Beginner's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Use mapping conventions


Fluent NHibernate uses a lot of conventions to map our domain model to a database schema. All of these conventions make sense in most of the day-to-day projects. Sometimes, it is important that we are able to add our own conventions to the mapping process, or even replace existing conventions with our own specific implementations. Fluent NHibernate is very flexible in this regard and offers us the possibility to fine-tune the system.

Conventions are added to the system during initialization, that is, before the mappings are processed. In Chapter 8, which talks about configuration, we will discuss how to add conventions in detail.

ID conventions

During the definition of the mappings for our ordering system domain, you might have noticed that we had to define the mapping of Id for each entity. Specifically, we had to define that we want to use the HiLo generator for ID generation over and over again. If we did not define the generator to use, then the default convention...