Agenda:OR Mapping- nhibernate To: Development Team By: Shahzad Sarwar

1. Presentation Agenda on nhibernate:
By: Shahzad Sarwar
To: Development Team

2. Part 1: 1st Aug 2009 3:30 PM
Part 2: Later
• Version 2.1 new features
• Performance tuning
• Proxing
• Cache
• Design pattern for NHibernate
• Case Specific provider

3. What is OR Mapping.
OR Mapping Frameworks
Overview of LINQ
Types of LINQ
LINQ 2 SQL
LINQ 2 Entities
Samples for LINQ
What is nHibernate?
A .Net port of Hibernate of Java
Covers: Mapping and Data query format
Hides SQL and ADO.NET.
XML Configuration File
<?xml version='1.0' encoding='utf-8'?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<!-- an ISessionFactory instance -->
<session-factory>
<!-- properties -->
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</
property>
<property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
<property name="connection.connection_string">Server=localhost;initial
catalog=nhibernate;User Id=;Password=</property>
<property name="show_sql">false</property>
<property name="dialect">NHibernate.Dialect.MsSql2000Dialect</property>
<property name="use_outer_join">true</property>
<!-- mapping files -->
<mapping resource="NHibernate.Auction.Item.hbm.xml" assembly="NHibernate.Auction" />
<mapping resource="NHibernate.Auction.Bid.hbm.xml" assembly="NHibernate.Auction" />
</session-factory>

4. </hibernate-configuration>
Persistent vs transient Objects
Level of abstraction
Page/Application level scope.
Eg:
Datetime dt;
Session/application level vatables
DB Level
Even shutdown of machine
Searlization as file /DB
POCO vs POJO
Samples
Nhibernate Basic
Mapping file - hbm.xml
Entity class
public class Category
{
#region Fields
private int _CategoryID;
private string _Description;
#endregion
#region Constructors
/// <summary>
/// Initializes a new instance of the Account class
/// </summary>
public Category()
{
}
public Category(int CategoryID, string Description)
{
this._CategoryID = CategoryID;
this._Description = Description;
}
#endregion
#region Properties
/// <summary>
/// Gets or sets theCategoryID for the current Category);
/// </summary>
public virtual int CategoryID
{
get { return _CategoryID; }
set { _CategoryID = value; }
}

5. /// <summary>
/// Gets or sets theDescription for the current Category);
/// </summary>
public virtual string Description
{
get { return _Description; }
set { _Description = value; }
}
#endregion
}
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="NHDEMO"
namespace="Lib">
<class name="Category" table="Category" dynamic-update="true" optimistic-lock="dirty" >
<id
name="CategoryID"
column="CategoryID">
<generator class="native"/>
</id>
<property name="Description" column="Description" type="String" length="250" />
</class>
</hibernate-mapping>
Show samples
Code generation
1. Avva Open source Solution
Get latest copy from
$NHTool.root
See attached Manual.

6. Introduction
Here is a tool for the use of your own applications that NHibernate. You can easily install and use
this helper kit. To download, please click the link at the top of the page. If you are using
NHibernate, you need to write a lot of persistent classes and XML mapping for each persistent
class. Also, you need to write the NHibernate config file. At this point, using this tool, you can
automatically create all these files in a few seconds.
Using
There are four tab screens on the tool.

7. 1. Connection: This screen allows you to connect your database with connection
parameters. It looks like the Visual Studio connection wizard. You need to set some
parameters to connect to your database.
2. Tables & Columns: This screen allows you to browse a selected database's tables and
select them to create files. Also, if you want, you can see a table's column information by
selecting from a table from a list and clicking "Preview Columns".

9. 3. Settings: This screen allows you to select some features, for example, copy the
NHibernate DLL and use dynamic updates. Also, you have to select your project folder to
configure the folders, namespaces, and assembly names.

10. 4. Generate: At the end of this, we can start the generate process. Just click Run and wait a
few seconds. You can view all the process details in this section.

11. After you've successfully completed the generating process, you can see the generated
files in the project folder. If you selected "Copy NHibernate DLL to project" and other
DLLs, the generator will copy it and create an NHibernate config file in your project's "bin"
folder.

12. Also, the generator creates a folder named App_Code in your project folder to put
persistent classes and mapping files in. It directly creates persistent classes to
App_Code, and mapping files creates them in the NHMappings folder, as follows:
Let's check it out how it's looking.
Persistent class

13. Mapping the XML file

14. 2. NConstruct Lite
Neat Code, but not customizable as it is commercial product

20. CRUDE Operation Sample
See Sample demo for CRUDE operations.
dynamic-update
dynamic-insert
select-before-update
one-to-one
one-to-many
many-to-one
bag
fetch = join-select for category
HQL
cascade
Nhibernate Analyiser:
1. SQL Server Analyiser

23. 2. nhIbernate Analyiser

24. 3.