Learning NHibernate 4

Name: Learning NHibernate 4 | Explore the Full Potential of NHibernate to Build Robust Data Access Code
Brand: Packt Publishing
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Explore the Full Potential of NHibernate to Build Robust Data Access Code

Suhas Chatekar(Autor*in)

Packt Publishing

1. Auflage

Erschienen am 31. Juli 2015

402 Seiten

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Inhalt

Cover
Copyright
Credits
About the Author
About the Reviewers
www.PacktPub.com
Table of Contents
Preface
Chapter 1: Introduction to NHibernate
What is ORM?
What is NHibernate?
What is new in NHibernate 4.0?
NHibernate for users of Entity Framework
Is using ORM a bad idea?
Why ORM is a better bet?
Non-functional features required by the data access layer
Building blocks of NHibernate
Mappings
Configuration
Session
Summary
Chapter 2: Let's Build a Simple Application
Explaining the approach used in learning NHibernate
The problem statement
The development setup
Visual Studio 2013
SQL Server 2012 Express
ReSharper
NUnit
NuGet
SQLite
The domain model
Employee
Leave
SeasonTicketLoan
SkillEnhancementAllowance
Adding some code
Adding the NuGet packages to projects
Back to our test
Summary
Chapter 3: Let's Tell NHibernate About Our Database
Important NHibernate terminology
Mapping the prerequisites
Different mechanisms to write the mappings
XML mappings
Fluent mapping
Mapping by code
XML mappings for the Employee class
Getting the development environment ready
Getting IntelliSense to work with the XML mapping files
Unit tests to verify the Employee mappings
The mappings
Hibernate-mapping
Class
Property
Identifier generation
Identity
Sequence
Hilo
Seqhilo
GUID
Guid.comb
Native
Assigned
Mapping associations
Associations and database tables
One-to-many association
Types of collections
Many-to-one association
One-to-one association
Many-to-many association
Mapping inheritance
Unit tests to verify the inheritance mappings
Table per class hierarchy
Table per subclass
Table per concrete class
Choosing the right inheritance mapping strategy
Mapping components
Mapping by code
Identifier
Property
Association
One-to-many
Many-to-one
One-to-one
Many-to-many
Component
Inheritance
Table per class hierarchy
Table per subclass
Table per concrete class
Complete mappings by code for the employee benefits domain
Fluent mapping a.k.a. Fluent NHibernate
Inheritance mappings
Table per class hierarchy
Table per concrete class
Table per subclass
Component mapping
Choosing the right mapping method
Summary
Chapter 4: NHibernate Warm-up
Warming up NHibernate succinctly
The NHibernate session architecture
XML configuration
Programmatic configuration
Loquacious configuration
Fluent configuration
Configuration options
Connection release mode
Dialect
Driver
Mappings
Programmatic configuration
Fluent configuration
Connection string
Caching
Session context
Batch size
Command timeout
Show SQL
Generating the database scripts from mappings
The database creation script
The database update scripts
Automatically create/update the database schema
Summary
Chapter 5: Let's Store Some Data into the Database
Entity states
Transactions and unit of work
Explicit and implicit transactions
Flush modes
Saving entities
Saving entities - complex scenarios
Transitive persistence using cascade styles
Transitive persistence/cascading in action
Saving a transient entity with association to other transient entities
A word on bidirectional associations
Updating associations on a persistent entity
Deleting a persistent entity with one or more associations set
Bidirectional associations and ownership
Ownership in many-to-many associations
Inverse and cascade
Order of operations
Entity equality
Why does equality matter?
Implementing equality
The architecture diagram
Summary
Chapter 6: Let's Retrieve Some Data from the Database
Querying the workflow
Different querying methods
Native SQL
Hibernate Query Language
Parameter binding
Criteria API
Filtering the criteria queries
The QueryOver API
LINQ
Which querying method should I use?
Joins
Different types of joins
Implicit joins
QueryOver joins explained
Outer joins
Theta style joins
Lazy loading
Lazy collections
Disabling laziness
Different lazy behaviors
Single-ended lazy associations
Proxy versus NoProxy
Lazy properties
Why use lazy loading?
Lazy loading gotcha's
Keeping the session open
Being aware of the select N+1 problem
Using lazy loading together with the right fetching strategy
Using automatic properties
Eager fetching
HQL
Criteria
QueryOver
LINQ
Pagination and ordering of results
Narrowing down the number of records returned by a query
Ordering the results
Retrieving entities by identifiers
Why use Load&T&?
Polymorphic queries
Summary
Chapter 7: Optimizing the Data Access Layer
Baseline and optimize
Organization of the chapter
Batching
Batching the write queries using ADO.NET batching
Limitations of batching
Memory consumption and batching
Read batching using future queries
Batching lazy collections
Fetching strategies
Select fetching
Join fetching
Subselect fetching
Choosing the right fetching strategy
Avoiding the select N+1 problem
What is the select N+1 problem?
Why select N+1 is a problem?
How do we fix the select N+1 problem?
Avoiding eager fetching
Future queries to the rescue
Using extra-lazy for lazy collections
Summary
Chapter 8: Using NHibernate in a Real-world Application
What kind of application are we building?
Architectural principles we will follow
No anaemic domain model
The onion architecture
Dependency inversion
Explicitly declaring the capabilities required
Unit of work
Feature 1 - onboarding an employee
Repository pattern
Where does the repository belong?
Back to onboarding an employee
Unit of work
Scope of unit of work for web applications
Session per request
Contextual sessions
Configuring CurrentSessionContext
Implementing session per request using the contextual sessions
Using the HTTP module
Using hooks in the global.ascx file
Using the action filters of ASP.NET MVC or Web API
WCF
Unit of work implementation
Unit of work spanning the whole HTTP request
Unit of work with custom scope
Feature 2 - updating the details of an employee
Updates using transitive persistence
Updating the detached entities
Why transitive persistence is better
Feature 3 - searching employees
Summary
Chapter 9: Advanced Data Access Patterns
Problems with the repository pattern
Generalization
Unclear and confusing contract
Leaky abstraction
God object anti-pattern
Specification pattern
Specification pattern in its original form
Specification pattern for NHibernate
Specification chaining
Limitations
Query object pattern
Extending the query object pattern
The limitations of the query object pattern
Summary
Chapter 10: Working with Legacy Database
Composite IDs
Composite foreign key
Components
Join-mapping to load data from multiple tables
Working with database views
Using subselect instead of views
Working with stored procedures
Using custom DTOs
Right place for DTOs
The conversion layer
Downsides of using custom DTOs
Custom lazy loading retention
Summary
Chapter 11: A Whirlwind Tour of Other NHibernate Features
Concurrency control
Optimistic concurrency control
Using optimistic-lock
Using the version property
Pessimistic concurrency control
Event system
Event listeners
Adding the audit trail for entities
Caching
Session level cache
Second level cache
Query cache
Stateless sessions
User-defined types
Other user-defined types
Summary
Index

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