Linq to NHibernate入门示例
Linq to NHibernate入门示例
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在微软发布C# 3.0后， LINQ在项目中发挥了重要作用。作为3.0语言身份的象征之一，学习LINQ有为重要。而NHibernate作为运用最广的ORM框架之一，在大型项目中广受开发人员的青睐。前不久，NHibernate Forge宣布NHiberante Linq 1.0正式发布了（参考）。 Linq to NHibernate有机的在NHibernate结合了Linq的查询功能，良好的把LINQ表达式转换为Criteria API。下面针对Linq to NHibernate做一个简单的Demo。
一、建立一个类名为NHibernateHelper的类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NHibernate;
using NHibernate.Cfg;
using System.Web;
namespace DBUtility
{
public sealed class NHibernateHelper
{
private const string CurrentSessionKey = "nhibernate.current_session";
private static readonly ISessionFactory sessionFactory;
static NHibernateHelper()
{
sessionFactory = new Configuration().Configure().BuildSessionFactory();
}
public static ISession GetCurrentSession()
{
HttpContext context = HttpContext.Current;
ISession currentSession = context.Items[CurrentSessionKey] as ISession;
if (currentSession == null)
{
currentSession = sessionFactory.OpenSession();
context.Items[CurrentSessionKey] = currentSession;
}
return currentSession;
}
public static void CloseSession()
{
HttpContext context = HttpContext.Current;
ISession currentSession = context.Items[CurrentSessionKey] as ISession;
if (currentSession == null)
{
// No current session
return;
}
currentSession.Close();
context.Items.Remove(CurrentSessionKey);
}
public static void CloseSessionFactory()
{
if (sessionFactory != null)
{
sessionFactory.Close();
}
}
}
}二、使用sql2k自带的northwind数据中的Products表为，建立Products实体和对应的Products.hbm.xml文件加上Categories和Categories.hbm.xml。
/*
Class Library : Domain
Author : Liudong
Create Date : 2009-10-15
*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.Serialization;
namespace Domain.Entities
{
Products#region Products
/// <summary>
/// Entitiy:Products object for NHibernate mapped table
/// </summary>
[DataContract]
public partial class Products
{
ProductID#region ProductID
/// <summary>
/// Field:ProductID
/// </summary>
[DataMember]
public virtual int? ProductID { get; set; }
#endregion
ProductName#region ProductName
/// <summary>
/// Field:ProductName
/// </summary>
[DataMember]
public virtual string ProductName { get; set; }
#endregion
QuantityPerUnit#region QuantityPerUnit
/// <summary>
/// Field:QuantityPerUnit
/// </summary>
[DataMember]
public virtual string QuantityPerUnit { get; set; }
#endregion
UnitPrice#region UnitPrice
/// <summary>
/// Field:UnitPrice
/// </summary>
[DataMember]
public virtual decimal UnitPrice { get; set; }
#endregion
UnitsInStock#region UnitsInStock
/// <summary>
/// Field:UnitsInStock
/// </summary>
[DataMember]
public virtual short UnitsInStock { get; set; }
#endregion
UnitsOnOrder#region UnitsOnOrder
/// <summary>
/// Field:UnitsOnOrder
/// </summary>
[DataMember]
public virtual short UnitsOnOrder { get; set; }
#endregion
ReorderLevel#region ReorderLevel
/// <summary>
/// Field:ReorderLevel
/// </summary>
[DataMember]
public virtual short ReorderLevel { get; set; }
#endregion
Discontinued#region Discontinued
/// <summary>
/// Field:Discontinued
/// </summary>
[DataMember]
public virtual bool Discontinued { get; set; }
#endregion
Categories#region Categories
/// <summary>
/// PrimaryKeyField:Categories
/// </summary>
[DataMember]
public virtual Categories CategoriesEntitiy { get; set; }
#endregion
}
#endregion
}
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Domain" namespace="Domain.Entities">
<class name="Domain.Entities.Products, Domain" table="Products">
<id name="ProductID" column="ProductID" type="int" >
<generator class="native" />
</id>
<property name="ProductName" column="ProductName" type="String" not-null="false"/>
<property name="QuantityPerUnit" column="QuantityPerUnit" type="String" not-null="true"/>
<property name="UnitPrice" column="UnitPrice" type="Decimal" not-null="true"/>
<property name="UnitsInStock" column="UnitsInStock" type="Int16" not-null="true"/>
<property name="UnitsOnOrder" column="UnitsOnOrder" type="Int16" not-null="true"/>
<property name="ReorderLevel" column="ReorderLevel" type="Int16" not-null="true"/>
<property name="Discontinued" column="Discontinued" type="Boolean" not-null="false"/>
<many-to-one name="CategoriesEntitiy" column="CategoryID" class="Domain.Entities.Categories, Domain" />
</class>
</hibernate-mapping>
/*
Class Library : Domain
Author : Liudong
Create Date : 2009-10-15
*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.Serialization;
namespace Domain.Entities
{
#region Categories
/// <summary>
/// Entitiy:Categories object for NHibernate mapped table
/// </summary>
[DataContract]
public partial class Categories
{
#region CategoryID
/// <summary>
/// Field:CategoryID
/// </summary>
[DataMember]
public virtual int? CategoryID { get; set; }
#endregion
#region CategoryName
/// <summary>
/// Field:CategoryName
/// </summary>
[DataMember]
public virtual string CategoryName { get; set; }
#endregion
#region Description
/// <summary>
/// Field:Description
/// </summary>
[DataMember]
public virtual string Description { get; set; }
#endregion
#region Picture
/// <summary>
/// Field:Picture
/// </summary>
[DataMember]
public virtual byte[] Picture { get; set; }
#endregion
#region Products
/// <summary>
/// ForeignKeyField:Products
/// </summary>
[DataMember]
public virtual IList<Products> ProductsList { get; set; }
#endregion
}
#endregion
}
/*
Class Library : Domain
Author : Liudong
Create Date : 2009-10-15
*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.Serialization;
namespace Domain.Entities
{
#region Categories
/// <summary>
/// Entitiy:Categories object for NHibernate mapped table
/// </summary>
[DataContract]
public partial class Categories
{
#region CategoryID
/// <summary>
/// Field:CategoryID
/// </summary>
[DataMember]
public virtual int? CategoryID { get; set; }
#endregion
#region CategoryName
/// <summary>
/// Field:CategoryName
/// </summary>
[DataMember]
public virtual string CategoryName { get; set; }
#endregion
#region Description
/// <summary>
/// Field:Description
/// </summary>
[DataMember]
public virtual string Description { get; set; }
#endregion
#region Picture
/// <summary>
/// Field:Picture
/// </summary>
[DataMember]
public virtual byte[] Picture { get; set; }
#endregion
#region Products
/// <summary>
/// ForeignKeyField:Products
/// </summary>
[DataMember]
public virtual IList<Products> ProductsList { get; set; }
#endregion
}
#endregion
}<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Domain" namespace="Domain.Entities">
<class name="Domain.Entities.Categories, Domain" table="Categories">
<id name="CategoryID" column="CategoryID" type="int" >
<generator class="native" />
</id>
<property name="CategoryName" column="CategoryName" type="String" not-null="false"/>
<property name="Description" column="Description" type="String" not-null="true"/>
<property name="Picture" column="Picture" type="Byte[]" not-null="true"/>
<bag name="ProductsList" inverse="true" lazy="true" cascade="all-delete-orphan">
<key column="CategoryID" />
<one-to-many class="Domain.Entities.Products, Domain" />
</bag>
</class>
</hibernate-mapping>
三、建立数据库访问层接口(IRepository)和其实现(Repository)，随便引入程序集 (Antlr3.Runtime.dll,Castle.Core.dll,Castle.DynamicProxy2.dll,Iesi.Collections.dll,log4net.dll,NHibernate.ByteCode.Castle.dll,NHibernate.dll,NHibernate.Linq.dll)。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace RepositoryDao
{
public interface IRepository<T> where T : class
{
/// <summary>
/// 返回IQueryable延迟加载集合
/// </summary>
/// <returns></returns>
IQueryable<T> GetAll();
}
}using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NHibernate;
using NHibernate.Linq;
namespace RepositoryDao
{
public class Repository<T> : IRepository<T> where T : class
{
public IQueryable<T> GetAll()
{
ISession session = DBUtility.NHibernateHelper.GetCurrentSession();
var result=from s in session.Linq<T>() select s;
return result;
}
}
}
四、建立一个ASP.NET MVC应用程序，同样引入上述的程序集。在Global.asax配置相应的MapRoute
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using System.Text;
namespace Linq2NHibernate
{
// Note: For instructions on enabling IIS6 or IIS7 classic mode,
// visit http://go.microsoft.com/?LinkId=9394801
public class MvcApplication : System.Web.HttpApplication
{
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
"GetPage", // Route name
"page/{pageId}/{pageSize}", // URL with parameters
new { controller = "Home", action = "GetPage", pageId = 1, pageSize = 10 } // Parameter defaults
);
routes.MapRoute(
"GetOrderBy", // Route name
"order", // URL with parameters
new { controller = "Home", action = "GetOrderBy" } // Parameter defaults
);
routes.MapRoute(
"GetWhere", // Route name
"where/{query}", // URL with parameters
new { controller = "Home", action = "GetWhere", query = "C" } // Parameter defaults
);
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = "" } // Parameter defaults
);
}
protected void Application_Start()
{
RegisterRoutes(RouteTable.Routes);
//log4net配置信息
log4net.Config.XmlConfigurator.Configure();//.DOMConfigurator.Configure();
}
protected void Application_Error(object sender, EventArgs e)
{
log4net.ILog logger = log4net.LogManager.GetLogger("Logger");
if (Server.GetLastError() != null)
{
Exception ex = Server.GetLastError().GetBaseException();
StringBuilder sb = new StringBuilder();
sb.Append(ex.Message);
sb.Append("\r\nSOURCE: " + ex.Source);
sb.Append("\r\nFORM: " + Request == null ? string.Empty : Request.Form.ToString());
sb.Append("\r\nQUERYSTRING: " + Request == null ? string.Empty : Request.QueryString.ToString());
sb.Append("\r\n引发当前异常的原因: " + ex.TargetSite);
sb.Append("\r\n堆栈跟踪: " + ex.StackTrace);
logger.Error(sb.ToString());
Server.ClearError();
}
}
}
}在Web.config中配置hibernate和log4net
<configuration>
<configSections>
<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
<sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>
<section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
<section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
<section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
</sectionGroup>
</sectionGroup>
</sectionGroup>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
<sectionGroup name="common">
<section name="logging" type="Common.Logging.ConfigurationSectionHandler, Common.Logging"/>
</sectionGroup>
<section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate"/>
</configSections>
<appSettings/>
<connectionStrings>
<add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
</connectionStrings>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<session-factory name="Linq2NHibernate">
<property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
<property name="connection.connection_string">
Server=(local);initial catalog=Northwind;Integrated Security=SSPI
</property>
<property name="adonet.batch_size">10</property>
<property name="show_sql">false</property>
<property name="dialect">NHibernate.Dialect.MsSql2000Dialect</property>
<property name="use_outer_join">true</property>
<property name="command_timeout">60</property>
<property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>
<!--2.1要配置延迟加载的代理 这里配置为Castle -->
<property name="proxyfactory.factory_class">NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property>
<!--实体xml隐射文件的程序集-->
<mapping assembly="Domain"/>
</session-factory>
</hibernate-configuration>
<log4net debug="true">
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<param name="File" value="Logs\Application.log.txt"/>
<param name="datePattern" value="MM-dd HH:mm"/>
<param name="AppendToFile" value="true"/>
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n"/>
</layout>
</appender>
<appender name="HttpTraceAppender" type="log4net.Appender.ASPNetTraceAppender">
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n"/>
</layout>
</appender>
<appender name="EventLogAppender" type="log4net.Appender.EventLogAppender">
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n"/>
</layout>
</appender>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="Logs/Log.txt"/>
<param name="AppendToFile" value="true"/>
<param name="MaxSizeRollBackups" value="10"/>
<param name="MaximumFileSize" value="100K"/>
<param name="RollingStyle" value="Size"/>
<param name="StaticLogFileName" value="true"/>
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n"/>
</layout>
</appender>
<root>
<level value="ALL"/>
<appender-ref ref="RollingLogFileAppender"/>
</root>
</log4net>
<system.web>在HomeController加入如下方法
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Domain.Entities;
using RepositoryDao;
namespace Linq2NHibernate.Controllers
{
[HandleError]
public class HomeController : Controller
{
public ActionResult Index()
{
ViewData["Message"] = "Welcome to ASP.NET MVC!";
return View();
}
public ActionResult About()
{
return View();
}
/// <summary>
/// 获取所有
/// </summary>
/// <returns></returns>
public ActionResult GetAll()
{
IRepository<Products> dao = new Repository<Products>();
var products = dao.GetAll();
ViewData["List"] = products;
return View();
}
/// <summary>