OR Mapping- nhibernate Presentation


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

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OR Mapping- nhibernate Presentation

  1. 1. Presentation Agenda on nhibernate: By: Shahzad Sarwar To: Development Team
  2. 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. 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. 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. 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. 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. 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".
  8. 8. 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.
  9. 9. 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.
  10. 10. 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.
  11. 11. 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
  12. 12. Mapping the XML file
  13. 13. 2. NConstruct Lite Neat Code, but not customizable as it is commercial product
  14. 14. 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
  15. 15. 2. nhIbernate Analyiser
  16. 16. 3.