NHibernate数据持久框架在多层项目开发中的应用

NHibernate数据持久框架在多层项目开发中的应用（一）

作者：jargon

一、工程环境：

在Microsoft Visual.net新建一解决方案，新建三个工程：

1、数据层 Search.Data

2、业务逻辑层Search.Mid

3、表现层：Search.Web
项目结构如《使用Nhibernate框架，快速开发Dotnet应用》中的图所示。

二、编写数据层：

1、编写数据对象的XML描术文件：

在Search.Data项目中新建hbm目录，并在该目录下新建一个Dir.hbm.xml的XML文件如下：

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">

</id>

<many-to-one name="UpArea" column="upId" />

</class>

</hibernate-mapping>

注意粗体的这一句，其中“Search.Data.Area”为数据类的名称，“Search.Data”为该项目的装配集名称，“aArea”为数据库表名。

? 2、编写数据对象的类：

??? 在该项目中新建一个类代码文件“Search.Data.Area.cs”如下：

using System;

using NHibernate;

using Search.Data;

using Search.Core.Utils;

namespace Search.Core.Mid

{

/// <summary>

///[模块名称]AreaImpl对区域的管理

///<remarks>

///[功能描述]

/// 1）添加区域、修改、删除

/// 2）

///</remarks>

///<remarks>

///[作者]

///</remarks>

///<remarks>

///-------------------------------------------------------

///[修改历史]

///2004-04-14 Initial creation

///-------------------------------------------------------

///</remarks>

/// </summary>

public class AreaImpl

{

private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(AreaImpl));

public AreaImpl()

{

}

public void AddArea(Area area)

{

ISession s = HibernateUtil.OpenSession();

ITransaction t = s.BeginTransaction();

try

{

s.Save(area);

t.Commit();

log.Info("Save " + area.ToString() + " ...OK");

}

catch(Exception e)

{

t.Rollback();

log.Error("Save " + area.ToString() + " ...Failed!", e);

throw e;

}

finally

{

s.Close();

}

public void UpdateArea(Area area)

{

ISession s = HibernateUtil.OpenSession();

ITransaction t = s.BeginTransaction();

try

{

s.Save(area);

t.Commit();

log.Info("Update " + area.ToString() + " ...OK");

}

catch(Exception e)

{

t.Rollback();

log.Error("Update " + area.ToString() + " ...Failed!", e);

throw e;

}

finally

{

s.Close();

}

public void DeleteArea(int areaId)

{

Area area = (Area)Util.LoadObject(typeof(Area), areaId, false);

if (area == null)

{

throw new Exception("No object " + typeof(Area).ToString() + " ID:" + areaId);

}

this.DeleteArea(area);

}

public void DeleteArea(Area area)

{

ISession s = HibernateUtil.OpenSession();

ITransaction t = s.BeginTransaction();

try

{

s.Delete(area);

t.Commit();

log.Info("Delete " + area.ToString() + " ...OK");

}

catch(Exception e)

{

t.Rollback();

log.Error("Delete " + area.ToString() + " ...Failed!", e);

throw e;

}

finally

{

s.Close();

}

三、编写中间层应用：

??? 在Search.Core中编写以下类：

??? 1、新建一个NHibernateUtil持久Session工厂工具类HibernateUtil.cs，代码如下，注意该类中使用了SingleTon模式，确保Session工厂的唯一性：

using System;

using System.Reflection;

using System.Data;

using System.Data.SqlClient;

using NHibernate;

using NHibernate.Cfg;

using NHibernate.Dialect;

using NHibernate.Tool.hbm2ddl;

namespace Search.Core.Utils

{

/// <summary>

///[模块名称]HibernateUtil NHibernate的Session工厂工具

///<remarks>

///[功能描述]

/// 采用SingleTon建立Session工厂；

///</remarks>

///<remarks>

///[作者]

///</remarks>

///<remarks>

///-----------------------------------------------------------

///[修改历史]

///2004-04-15 Initial creation

///-------------------------------------------------------

///</remarks>

/// </summary>

public class HibernateUtil

{

private static ISessionFactory sessions;

private static Configuration cfg;

private static Dialect dialect;

private HibernateUtil()

{

}

public static ISession OpenSession()

{

if (sessions == null)

{

//创建Session工厂

BuildSessionFactory();

}

return sessions.OpenSession();

}

private static void BuildSessionFactory()

{

ExportSchema( new string[] {

"Area.hbm.xml",

"Dir.hbm.xml"

} , false);

}

private static void ExportSchema(string[] files, bool exportSchema)

{

cfg = new Configuration();

for (int i=0; i<files.Length; i++)

{

cfg.AddResource("Search.Data.hbm." + files[i], Assembly.Load("Search.Data"));

}

dialect = Dialect.GetDialect();

if(exportSchema) new SchemaExport(cfg).Create(true, true);

sessions = cfg.BuildSessionFactory( );

}

/// <summary>

/// Drops the schema that was built with the TestCase's Configuration.

/// </summary>

public void DropSchema()

{

new SchemaExport(cfg).Drop(true, true);

}

2、编写中间层应用类AreaImpl.cs，注意事务的控制，另该类中使用了Log4net作为日志工具。

using System;

using NHibernate;
using Search.Data;
using Search.Core.Utils;

namespace Search.Core.Mid
{
/// <summary>
///[模块名称]AreaImpl对区域的管理 
///<remarks>
///[功能描述] 
/// 1）添加区域、修改、删除 
/// 2） 
///</remarks>
///<remarks>
///[作者] 
///</remarks>
///<remarks>
///------------------------------------------------------- 
///[修改历史] 
///2004-04-14 Initial creation 
///------------------------------------------------------- 
///</remarks>
/// </summary>
public class AreaImpl
{
 private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(AreaImpl));

  public AreaImpl()
  {
  }

    public void AddArea(Area area)
  {
   ISession s = HibernateUtil.OpenSession();
   ITransaction t = s.BeginTransaction();
   try
   {
    s.Save(area);
    t.Commit();
    log.Info("Save " + area.ToString() + " ...OK");
   }
   catch(Exception e)
   {
    t.Rollback();
    log.Error("Save " + area.ToString() + " ...Failed!", e);
    throw e;
   }
   finally
   {
    s.Close();
   }
  }

  public void UpdateArea(Area area)
  {
   ISession s = HibernateUtil.OpenSession();
   ITransaction t = s.BeginTransaction();
   try
   {
    s.Save(area);
    t.Commit();
    log.Info("Update " + area.ToString() + " ...OK");
   }
   catch(Exception e)
   {
    t.Rollback();
    log.Error("Update " + area.ToString() + " ...Failed!", e);
    throw e;
   }
   finally
   {
    s.Close();
   }
  }

  public void DeleteArea(int areaId)
  {
   Area area = (Area)Util.LoadObject(typeof(Area), areaId, false);
   if (area == null)
   {
    throw new Exception("No object " + typeof(Area).ToString() + " ID:" + areaId);
   }
   this.DeleteArea(area);
  }

  public void DeleteArea(Area area)
  {
   ISession s = HibernateUtil.OpenSession();
   ITransaction t = s.BeginTransaction();
   try
   {
    s.Delete(area);
    t.Commit();
    log.Info("Delete " + area.ToString() + " ...OK");
   }
   catch(Exception e)
   {
    t.Rollback();
    log.Error("Delete " + area.ToString() + " ...Failed!", e);
    throw e;
   }
   finally
   {
    s.Close();
   }
  }
}
}

三、编写表现层

??? 哈表现层就不用写了吧，直接调用AreaImpl类就可以了。。。还是说说吧

??? 1、增加Dir（注，这是另一个数据对象）

DirImpl ob = new DirImpl();

Dir dir = new Dir();

dir.Id = this.lbDirId.Text.Trim();

dir.Name = this.lbDirName.Text.Trim();

dir.UpDir = (Dir)Util.LoadObject(typeof(Dir), this.upId, false);

dir.UrlCount = 0;

ob.AddDir(dir);

??? 2、删除。。。

posted on Monday, April 26, 2004 8:07 PM

posted on 2005-02-17 16:53 老烟阅读(523) 评论(0) 编辑收藏举报

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NHibernate数据持久框架在多层项目开发中的应用

NHibernate数据持久框架在多层项目开发中的应用（一）