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  • Book Overview & Buying Learning NHibernate 4
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Learning NHibernate 4

Learning NHibernate 4

By : Suhas H Chatekar
3.6 (9)
Buy this Book
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Learning NHibernate 4

Learning NHibernate 4

3.6 (9)
By: Suhas H Chatekar
Buy this Book

Overview of this book

This book targets .NET developers who have never used an ORM before, developers who have used an ORM before but are new to NHibernate, or have used NHibernate sparingly and want to learn more about NHibernate.
Table of Contents (13 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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Conventions
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Reader feedback
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Customer support
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1
1. Introduction to NHibernate
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1. Introduction to NHibernate
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What is ORM?
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What is NHibernate?
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What is new in NHibernate 4.0?
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NHibernate for users of Entity Framework
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Is using ORM a bad idea?
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Building blocks of NHibernate
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Summary
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2. Let's Build a Simple Application
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2. Let's Build a Simple Application
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Explaining the approach used in learning NHibernate
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The problem statement
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The development setup
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The domain model
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Adding some code
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Summary
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3. Let's Tell NHibernate About Our Database
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3. Let's Tell NHibernate About Our Database
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Important NHibernate terminology
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Mapping the prerequisites
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Different mechanisms to write the mappings
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XML mappings for the Employee class
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Identifier generation
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Mapping associations
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Mapping inheritance
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Mapping components
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Mapping by code
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Fluent mapping a.k.a. Fluent NHibernate
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Choosing the right mapping method
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Summary
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4. NHibernate Warm-up
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4. NHibernate Warm-up
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Warming up NHibernate succinctly
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The NHibernate session architecture
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XML configuration
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Programmatic configuration
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Loquacious configuration
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Fluent configuration
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Configuration options
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Generating the database scripts from mappings
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Summary
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5. Let's Store Some Data into the Database
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5. Let's Store Some Data into the Database
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Entity states
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Transactions and unit of work
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Saving entities
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Transitive persistence using cascade styles
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Transitive persistence/cascading in action
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Bidirectional associations and ownership
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Order of operations
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Entity equality
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The architecture diagram
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Summary
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6. Let's Retrieve Some Data from the Database
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6. Let's Retrieve Some Data from the Database
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Querying the workflow
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Different querying methods
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Joins
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Lazy loading
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Eager fetching
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Pagination and ordering of results
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Retrieving entities by identifiers
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Polymorphic queries
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Summary
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7. Optimizing the Data Access Layer
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7. Optimizing the Data Access Layer
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Baseline and optimize
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Organization of the chapter
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Batching
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Fetching strategies
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Avoiding the select N+1 problem
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Avoiding eager fetching
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Using extra-lazy for lazy collections
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Summary
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8. Using NHibernate in a Real-world Application
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8. Using NHibernate in a Real-world Application
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What kind of application are we building?
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Architectural principles we will follow
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Feature 1 – onboarding an employee
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Unit of work
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Feature 2 – updating the details of an employee
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Feature 3 – searching employees
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Summary
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9. Advanced Data Access Patterns
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9. Advanced Data Access Patterns
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Problems with the repository pattern
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Specification pattern
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Query object pattern
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Summary
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10. Working with Legacy Database
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10. Working with Legacy Database
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Composite IDs
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Components
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Join-mapping to load data from multiple tables
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Working with database views
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Using subselect instead of views
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Working with stored procedures
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Using custom DTOs
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Summary
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11. A Whirlwind Tour of Other NHibernate Features
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11. A Whirlwind Tour of Other NHibernate Features
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Concurrency control
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Event system
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Caching
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Stateless sessions
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User-defined types
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Summary
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Index
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Index

What is new in NHibernate 4.0?

The General Availability release of NHibernate 4.0.3.400 was released on August 17 2014. This is the latest release of NHibernate as of the time of writing of this book. This release is quite important from a lot of perspectives. This is a major release of NHibernate that has come almost after three and a half years, so it contains a lot of interesting features and bug fixes.

If you are new to the ORM land or have never used NHibernate before, then you may not find this section very interesting. But hey, why not keep reading and you might find something that strikes a chord with you:

  • NH 4.0 is built for .NET 4.0. This may not mean much for the users of NHibernate 4.0 as you can still use older versions of NHibernate on a project that is built on .NET 4.0. However, this is a major move for NHibernate since it now gives NHibernate developers the ability to utilize new features of .NET 4.0. An immediate consequence of this was that NHibernate 4.0 now does not depend on the Iesi.Collection library to support sets (Iesi.Collections.Generic.ISet<T>) because .NET 4.0 has native support for sets, in the form of ISet<T>, and implementations such as HashSet<T>. Back in the days when the old versions of .NET did not have support for sets, the Iesi.Collections library offered a mature set functionality. NHibernate had a dependency on this external library as NHibernate uses sets to represent collections.
  • Support for SQL Server 2012 has improved with the implementation of the native IIF function, query paging, and SQL Server 2012 sequences.
  • "Mapping by code" rids you of having to write and maintain cumbersome XML mapping files. However, the general audience was never happy with this feature as it was buggy till recent times. NHibernate 4.0 has several defects in this area fixed, thus giving Mapping by code a facelift.
  • We all love LINQ and we all hated the fact that NH's LINQ support never matched that of Criteria or QueryOver. There has been great community contribution in this area with over 140 issues fixed. LINQ support in NHibernate 4.0 has matched that of other query providers in a lot of respects. We will be using this feature a lot in the coming chapters of this book.
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