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

NHibernate log messages


Now that we have some basic logging configured, NHibernate spits out a lot of information. You will see various messages displayed such as "Using reflection optimizer" and "Mapping resource:". These messages let you know what NHibernate is doing, what stage of operation it is in, and what issues (if any) it encounters.

One of the first things you will see in these logs is the name of the assembly that we told NHibernate to read the mapping files from.

07:18:08.295 [10] INFO NHibernate.Cfg.Configuration - Mapping resource: Ordering.Data.Mapping.Address.hbm.xml

As we included the *.hbm.xml files in the Ordering.Data.Mapping assembly, NHibernate is processing these files and logging as it processes each property of each file. NHibernate will list each of the properties in the mapping document, which class it belongs to, as well as the database field that is it being mapped to. An example of one of these mapping entries would look something like as follows:

07:32:49.299...