Book Image

NHibernate 4.x Cookbook - Second Edition

By : Gunnar Liljas, Alexander Zaytsev, Jason Dentler
Book Image

NHibernate 4.x Cookbook - Second Edition

By: Gunnar Liljas, Alexander Zaytsev, Jason Dentler

Overview of this book

NHibernate is a mature, flexible, scalable, and feature-complete open source project for data access. Although it sounds like an easy task to build and maintain database applications, it can be challenging to get beyond the basics and develop applications that meet your needs perfectly. NHibernate allows you to use plain SQL and stored procedures less and keep focus on your application logic instead. Learning the best practices for a NHibernate-based application will help you avoid problems and ensure that your project is a success. The book will take you from the absolute basics of NHibernate through to its most advanced features, showing you how to take full advantage of each concept to quickly create amazing database applications. You will learn several techniques for each of the four core NHibernate tasks—configuration, mapping, session and transaction management, and querying—and which techniques fit best with various types of applications. In short, you will be able to build an application using NHibernate by the end of the book. You will also learn how to best implement enterprise application architecture patterns using NHibernate, leading to clean, easy-to-understand code and increased productivity. In addition to new features, you will learn creative ways to extend the NHibernate core, as well as gaining techniques to work with the NHibernate search, shards, spatial, envers, and validation projects.
Table of Contents (17 chapters)
NHibernate 4.x Cookbook Second Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Creating an audit-event listener


Auditing is another common security-related task. An audit log is an append-only record of changes in a system that allows you to trace a particular action back to its source. In this recipe, we will show you how you can easily create an audit log to track changes to your entities.

How to do it…

  1. Create a new console application project named AuditEventListener.

  2. Add a reference to our Eg.Core model from Chapter 2, Models and Mappings.

  3. Install the NHibernate and log4net packages using the NuGet Package Manager Console by executing the following commands:

    Install-Package NHibernate
    Install-Package log4net
    
  4. Add an App.config with a standard NHibernate and log4net configuration.

  5. Just before the end of the sessionfactory element, add the following three event elements:

    <event type="pre-insert">
      <listener class="AuditEventListener.EventListener, 
                AuditEventListener" />
    </event>
    <event type="pre-update">
      <listener class="AuditEventListener...