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NHibernate 4.x Cookbook

NHibernate 4.x Cookbook - Second Edition

By : Liljas, Darshan Joshi, Zaytsev, Jason Dentler
5 (1)
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NHibernate 4.x Cookbook

NHibernate 4.x Cookbook

5 (1)
By: Liljas, Darshan Joshi, Zaytsev, Jason Dentler
Buy this Book

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 (11 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Sections
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. The Configuration and Schema
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1. The Configuration and Schema
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Introduction
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Installing NHibernate
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Configuring NHibernate with hibernate.cfg.xml
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Configuring NHibernate with App.config or Web.config
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Configuring NHibernate with code
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Configuring NHibernate with Fluent NHibernate
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Configuring NHibernate logging
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Generating the database
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Scripting the database
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Updating the database
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Using NHibernate schema tool
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2. Models and Mappings
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2. Models and Mappings
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Mapping a class with XML
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Creating class hierarchy mappings
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Creating class components
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Mapping a one-to-many relationship
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Mapping a many-to-many relationship
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Mapping collections of elements and components
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Setting up a base entity class
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Handling versioning and concurrency
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Mapping by code
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Mapping by convention
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Creating mappings fluently
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Bidirectional one-to-many class relationships
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Mapping enumerations
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Immutable entities
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Mapping relations to non-primary keys
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Using lazy properties
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Mapping joins
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Using calculated properties
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Using serializable values
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Dynamic components
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Mapping
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3. Sessions and Transactions
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3. Sessions and Transactions
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Introduction
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Setting up session-per-web request
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Setting up session-per-presenter
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Creating a session ASP.NET MVC action filter
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Creating a transaction ASP.NET MVC action filter
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Save entities to the database
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Using session.Merge
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Using session.Refresh
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Handle concurrency using session.Lock
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There's more…
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Using dictionaries as entities
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Using NHibernate with transaction scope
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4. Queries
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4. Queries
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Introduction
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Query entities by ID
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Using LINQ to NHibernate
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Using CriteriaQueries
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Using QueryOver
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Using QueryOver projections and aggregates
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Using the Hibernate Query Language
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Using native SQL
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Eager loading with LINQ
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Eager loading with Criteria
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Eager loading with QueryOver
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Eager loading with HQL
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Eager loading with SQL
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Using named queries
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Using detached queries
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Using HQL for bulk data changes
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Filtering collections
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Using result transformers
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Extra lazy collections
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5. Improving Performance
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5. Improving Performance
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Reducing application startup time
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Using MultiCriteria
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Using MultiQuery
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Using Futures
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Eager loading child collections
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Using stateless sessions
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Using read-only entities
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Use the second-level cache
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Configuring the second-level cache with code
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Sharding databases for performance
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6. Testing
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6. Testing
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Introduction
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Using NHibernate Profiler
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Profiling NHibernate with Glimpse
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Fast testing with the SQLite in-memory database
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Preloading data with SQLite
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Using Fluent NHibernate persistence testing
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Using the Ghostbusters test
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7. Data Access Layer
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7. Data Access Layer
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Introduction
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Transaction auto-wrapping for the data access layer
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Setting up an NHibernate repository
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Using named queries in the data access layer
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Using ICriteria in the data access layer
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Using paged queries in the data access layer
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Using LINQ specifications in the data access layer
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8. Extending NHibernate
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8. Extending NHibernate
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Introduction
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Creating an encrypted string type
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Creating a money type
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Using well-known instance types
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Using dependency injection with entities
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Creating an audit-event listener
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Creation and change stamping of entities
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Generating trigger-based auditing
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Implementing a soft-delete pattern
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Setting Microsoft SQL's Context_Info
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Using dynamic connection strings
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Using custom dialect functions
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Using custom functions in LINQ
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Extending the LINQ provider
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9. NHibernate Contribution Projects
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9. NHibernate Contribution Projects
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Introduction
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Property validation with attributes
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Creating validator classes
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Setting up full-text searches
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Auditing data with Envers
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Using NHibernate Spatial
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Index
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Index

Configuring NHibernate with App.config or Web.config

Another common method for configuring NHibernate uses a .NET configuration file. In this recipe, we will show you how to configure NHibernate using App.config or Web.config files, to provide an identical configuration to the previous recipe.

Getting ready

  1. Complete the steps in the Installing NHibernate recipe.
  2. Add a console application project named ConfigByAppConfig to your solution.
  3. Set it as the Startup project for your solution.
  4. Install NHibernate to the ConfigByAppConfig project using the NuGet Package Manager Console.
  5. In ConfigByAppConfig, add a reference to the Eg.Core project.
  6. Add an App.config file to your project.

How to do it…

  1. Open the App.config file.
  2. Declare a section for the NHibernate configuration, as shown here:
    <configSections>
  <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, 
NHibernate" />
</configSections>
  3. Add a connectionStrings section with a connection string:
    <connectionStrings>
  <add name="db" connectionString="Server=.\SQLEXPRESS; Database=NHCookbook; Trusted_Connection=SSPI"/>
</connectionStrings>
  4. Add your hibernate-configuration section:
    <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
  <session-factory>
    <property name="dialect">
      NHibernate.Dialect.MsSql2008Dialect, NHibernate
    </property>
    <property name="connection.connection_string_name">
      db
    </property>
    <property name="adonet.batch_size">
      100
    </property>
  </session-factory>
</hibernate-configuration>
  5. Your completed App.config file should look similar to this:
    <?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, 
      NHibernate" />
  </configSections>
  <connectionStrings>
    <add name="db" connectionString="Server=.\SQLEXPRESS; Database=NHCookbook; Trusted_Connection=SSPI" />
  </connectionStrings>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
  <session-factory>
    <property name="dialect">
      NHibernate.Dialect.MsSql2008Dialect, NHibernate
    </property>
    <property name="connection.connection_string_name">
      db
    </property>
    <property name="adonet.batch_size">
      100
    </property>
  </session-factory>
</hibernate-configuration>
</configuration>
  6. Open Program.cs and add using NHibernate.Cfg; to the beginning of the file.
  7. In the Main method, add the following code to configure NHibernate:
    var nhConfig = new Configuration().Configure();
var sessionFactory = nhConfig.BuildSessionFactory();
Console.WriteLine("NHibernate Configured!");
Console.ReadKey();
  8. Build and run your application. You will see the text NHibernate Configured!

How it works…

This recipe works in the same way as the previous recipe. However, in this recipe, we have moved the hibernate-configuration element from the hibernate.cfg.xml file to App.config. The connection.connection_string_name property references our connection string named db. We can name the connection string anything we like, as long as this property matches the connection string's name.

There's more…

An ASP.NET application's Web.config uses the common .NET framework configuration platform and has the same structure as App.config. You can therefore use the same technique to configure NHibernate in a web application.

See also

  • Configuring NHibernate with hibernate.cfg.xml
  • Configuring NHibernate with code
  • Configuring NHibernate with Fluent NHibernate
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