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NHibernate 4.x Cookbook - Second Edition

By : Liljas, Darshan Joshi, Zaytsev, Jason Dentler

5 (1)

NHibernate 4.x Cookbook

5 (1)

By: Liljas, Darshan Joshi, 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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Sections

Conventions

Reader feedback

Customer support

Free Chapter

1. The Configuration and Schema

1. The Configuration and Schema

Introduction

Installing NHibernate

Configuring NHibernate with hibernate.cfg.xml

Configuring NHibernate with App.config or Web.config

Configuring NHibernate with code

Configuring NHibernate with Fluent NHibernate

Configuring NHibernate logging

Generating the database

Scripting the database

Updating the database

Using NHibernate schema tool

2. Models and Mappings

2. Models and Mappings

Mapping a class with XML

Creating class hierarchy mappings

Creating class components

Mapping a one-to-many relationship

Mapping a many-to-many relationship

Mapping collections of elements and components

Setting up a base entity class

Handling versioning and concurrency

Mapping by code

Mapping by convention

Creating mappings fluently

Bidirectional one-to-many class relationships

Mapping enumerations

Immutable entities

Mapping relations to non-primary keys

Using lazy properties

Mapping joins

Using calculated properties

Using serializable values

Dynamic components

Mapping

3. Sessions and Transactions

3. Sessions and Transactions

Introduction

Setting up session-per-web request

Setting up session-per-presenter

Creating a session ASP.NET MVC action filter

Creating a transaction ASP.NET MVC action filter

Save entities to the database

Using session.Merge

Using session.Refresh

Handle concurrency using session.Lock

There's more…

Using dictionaries as entities

Using NHibernate with transaction scope

4. Queries

4. Queries

Introduction

Query entities by ID

Using LINQ to NHibernate

Using CriteriaQueries

Using QueryOver

Using QueryOver projections and aggregates

Using the Hibernate Query Language

Using native SQL

Eager loading with LINQ

Eager loading with Criteria

Eager loading with QueryOver

Eager loading with HQL

Eager loading with SQL

Using named queries

Using detached queries

Using HQL for bulk data changes

Filtering collections

Using result transformers

Extra lazy collections

5. Improving Performance

5. Improving Performance

Reducing application startup time

Using MultiCriteria

Using MultiQuery

Using Futures

Eager loading child collections

Using stateless sessions

Using read-only entities

Use the second-level cache

Configuring the second-level cache with code

Sharding databases for performance

6. Testing

6. Testing

Introduction

Using NHibernate Profiler

Profiling NHibernate with Glimpse

Fast testing with the SQLite in-memory database

Preloading data with SQLite

Using Fluent NHibernate persistence testing

Using the Ghostbusters test

7. Data Access Layer

7. Data Access Layer

Introduction

Transaction auto-wrapping for the data access layer

Setting up an NHibernate repository

Using named queries in the data access layer

Using ICriteria in the data access layer

Using paged queries in the data access layer

Using LINQ specifications in the data access layer

8. Extending NHibernate

8. Extending NHibernate

Introduction

Creating an encrypted string type

Creating a money type

Using well-known instance types

Using dependency injection with entities

Creating an audit-event listener

Creation and change stamping of entities

Generating trigger-based auditing

Implementing a soft-delete pattern

Setting Microsoft SQL's Context_Info

Using dynamic connection strings

Using custom dialect functions

Using custom functions in LINQ

Extending the LINQ provider

9. NHibernate Contribution Projects

9. NHibernate Contribution Projects

Introduction

Property validation with attributes

Creating validator classes

Setting up full-text searches

Auditing data with Envers

Using NHibernate Spatial

Index

Index

Customer Reviews

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Updating the database

It's usually required to update your database if mappings for your application have changed. In this recipe, we'll generate a SQL script to update your database objects.

Getting ready

Complete the Configuring NHibernate with App.config or Web.config recipe at the beginning of this chapter.

Note

This recipe works for any RDBMS supported by NHibernate. To use a different system, adjust your connection string and dialect accordingly.

How to do it...

Open Program.cs.

Add these using statements to the beginning of the file:

using Eg.Core;
using NHibernate.Mapping.ByCode; 
using NHibernate.Tool.hbm2ddl;

Modify the Main method to look similar to this:

var nhConfig = new Configuration().Configure();
var mapper = new ConventionModelMapper();
nhConfig.AddMapping(mapper.CompileMappingFor(new[] { typeof(TestClass) }));
var update = new SchemaUpdate(nhConfig);
update.Execute(false, true);
Console.WriteLine("The tables have been updated");
Console.ReadKey();

Build and run your application. Inspect the table(s) in the database.
Modify TestClass to include an additional property:
```
public virtual string Description { get; set; }
```
Build and run the application again. The TestClass table should now have a new column corresponding to the Description property.

How it works...

Using the mapping metadata from the configuration object and the current dialect, hbm2ddl analyzes the existing structure of your database and generates a script to fulfill the differences. The SchemaUpdate only adds missing objects, and does not try to remove anything.

See also

Configuring NHibernate with App.config
Configuring NHibernate with hibernate.cfg.xml
Configuring NHibernate with code
Configuring NHibernate with Fluent NHibernate
Generating the database
Scripting the database

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