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

Using serializable values


At some point you may need to store objects in the database that are either impossible to map using NHibernate (the object may be of a type you have no control over) or the resulting relational model would simply be too complex. As long as the objects are of a type that is serializable (using BinaryFormatter), NHibernate can save and retrieve them transparently.

In this recipe we'll show a crude NHibernate based error log, which stores raised Exceptions, complete with any nested InnerExceptions.

Getting ready

Complete the Getting ready instructions at the beginning of this chapter.

How to do it…

  1. Add a new folder named SerializableValues to the MappingRecipes project.

  2. Add a new class named Error to the folder:

    public class Error
    {
      public virtual Guid Id { get; set; }
      public virtual DateTime ErrorDateTime { get; set; }
      public virtual Exception Exception { get; set; }
    }
  3. Add an embedded mapping named Error.hbm.xml to the folder:

    <?xml version="1.0" encoding="utf-8"...