MVC框架示例

框架脱胎于PetShop3.0
分为如下几层
Web
BLL
IDAL
Model
DALFactory
NHDAL

根据PetShop3.0的框架:Web层只依赖于BLL和Model,也就是说web层调用BLL层方法返回的Model层定义的数据;BLL层依赖于IDAL,Model,这一层实际是使用IDAL中的方法组合为业务,并处理IDAL层返回的Model;IDAL定义了所有底层方法,给DAL层留下接口;Model定义了对象实体,只有属性没有方法,基本上可以作为抽象类定义。DALFactory的作用是根据配置文件中的设置动态取出取出数据访问层(Data Access Layer)对象的实例,这样做就把实际使用的DAL跟BLL层分离,如果需要切换到其他DAL,只要修改此层就可以了。

本项目使用NH(NHibernate)作为DAl,所以命名为NHDAL。NHDAL依赖于Model,继承Model中属性的定义,并添加了NH需要用到的属性器。同时NHDAL实现IDAL中定义的方法。

下面是对登陆验证和储存日志的实例
先看看IDAL和Model中的定义吧

代码段一 IDAL接口定义

using System;

namespace CManager.IDAL.Log
{
    /**//// <summary>
    /// ILoginLog 的摘要说明。
    /// </summary>
    public interface ISignLog
    {
        void LogSignIn( string userid, string sessionid, string clientip, DateTime logindate );

        bool CheckPassword( string userid, string password);
    }
}

代码段二 Model对象定义


using System;

namespace CManager.Model.Log
{
    /**//// <summary>
    /// LoginInfo 的摘要说明。
    /// </summary>
    public class SignLogInfo
    {
        public int SignLogID
        {
            get {return _SignLogID;}
        }
        public string UserID
        {
            get {return _UserID;}
        }
        public string SessionID
        {
            get {return _SessionID;}
        }
        public string ClientIP
        {
            get {return _ClientIP;}
        }
        public DateTime SignInDate
        {
            get {return _SignInDate;}
        }
        public DateTime SignOutDate
        {
            get {return _SignOutDate;}
        }

        protected int _SignLogID;
        protected string _UserID;
        protected string _SessionID;
        protected string _ClientIP;
        protected DateTime _SignInDate;
        protected DateTime _SignOutDate;
    }
}

然后是BLL中调用。因为BLL不依赖于任何DAL,所以通过中间层DALFactory创建DAL的实例,并通过IDAl定义的接口返回给BLL。

代码段三 BLL方法


using System;
using System.Collections;
using System.Web;

using CManager.Model.Log;
using CManager.Model.Collections;
using CManager.DALFactory.Log;
using CManager.IDAL.Log;


namespace CManager.BLL.Log
{
    public class Log
    {

        //未完成,应该返回Module.Log.Account
        public static bool Login ( string userid, string password, HttpContext context )
        {
            ISignLog log = LogFactory.CreateSignLog();
            if (log.CheckPassword(userid,password))
            {
                log.LogSignIn( userid ,context.Session.SessionID, context.Request.UserHostAddress, DateTime.Now );
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}

代码段四 DALFactory方法


using System;
using CManager.IDAL.Log;
using System.Reflection;

namespace CManager.DALFactory.Log
{
    public class LogFactory
    {
        public static ISignLog CreateSignLog()
        {
            //获取web.config里DAL的设置
            string path = System.Configuration.ConfigurationSettings.AppSettings["WebDAL"];
            //组合出类名
            string className = path + ".Log.SignLog";
            //运行时创建类实例,需要类实现实例化
            return (ISignLog) Assembly.Load(path).CreateInstance(className);
        }
    }
}
代码段五 web.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <!-- 这段大家都熟悉了 -->
  <configSections>
      <section name="nhibernate" type="System.Configuration.NameValueSectionHandler, System, Version=1.0.5000.0,Culture=neutral, PublicKeyToken=b77a5c561934e089" />
  </configSections>
  <nhibernate>
    <add key="hibernate.connection.provider" value="NHibernate.Connection.DriverConnectionProvider" />
    <add key="hibernate.connection.driver_class" value="NHibernate.Driver.SqlClientDriver" />
    <add key="hibernate.connection.connection_string" value="server=127.0.0.1;database=CManager;uid=sa;pwd=;" />
    <add key="hibernate.connection.isolation" value="ReadCommitted"/>
    <add key="hibernate.dialect" value="NHibernate.Dialect.MsSql2000Dialect" />
  </nhibernate>
    <appSettings>
        <!-- 默认显示每页显示记录数 -->
        <add key="DefaultRecordCount" value="20" />
        <!-- *数据库层所在命名空间* 实际使用的DAL在这里设置   -->
        <add key="WebDAL" value="CManager.NHDAL" />
  </appSettings>
  <system.web>
                <!-- 这段按下,不占页面了 -->  
 </system.web>

</configuration>

理论上Web层并不知道IDAL层定义的原子方法,只使用BLL层给出的方法。这就是所谓的业务层与表现层分开。Web层只接受用户发出的请求,然后处理参数交给BLL层,并对BLL层返回的结果进行判断返回给结果。

代码段六 Web层调用


using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

using CManager.BLL.Log;
using CManager.Model.Log;

namespace BTTech.CManager.Web
{
    /**//// <summary>
    /// Login 的摘要说明。
    /// </summary>
    public class Login : PageBase
    {
        protected System.Web.UI.WebControls.TextBox UserName;
        protected System.Web.UI.WebControls.TextBox Password;
        protected System.Web.UI.HtmlControls.HtmlInputImage ImageButton1;
   
        private void Page_Load(object sender, System.EventArgs e)
        {
           
        }

        private void ImageButton1_ServerClick(object sender, System.Web.UI.ImageClickEventArgs e)
        {
            if (Log.Login( UserName.Text, Password.Text, this.Context))
                Response.Redirect("",true);
            else
                Alert("用户名或密码错误");
        }
    }
}

最后是本文的主角NHDAL了,虽然最后出现,却是所有实际操作的最终执行者。

代码段七 实现IDAL

 

using System;
using NHibernate.Cfg;
using NHibernate;

namespace CManager.NHDAL.Log
{
    /**//// <summary>
    /// SignLog 的摘要说明。
    /// </summary>
    public class SignLog : NHObject,CManager.IDAL.Log.ISignLog
    {
        public SignLog()
        {
        }

        public void LogSignIn(string userid, string sessionid, string clientip, DateTime logindate)
        {
            ISession session = CreateSession();
            session.Save(new SignLogInfo(userid, sessionid, clientip, logindate));
        }

        public bool CheckPassword( string userid, string password)
        {//未完成
            return true;
        }
    }
}

代码段八 继承Model

using System;
using CManager.Model;

namespace CManager.NHDAL.Log
{
    /**//// <summary>
    /// SignLog 的摘要说明。
    /// </summary>
    public class SignLogInfo : CManager.Model.Log.SignLogInfo
    {
        private int Id
        {
            get {return this._SignLogID;}
            set    {this._SignLogID = value;}
        }
        private string NH_UserID
        {
            get {return _UserID;}
            set {_UserID = value;}
        }
        private string NH_SessionID
        {
            get {return _SessionID;}
            set {_SessionID = value;}
        }
        private string NH_ClientIP
        {
            get {return _ClientIP;}
            set {_ClientIP = value;}
        }
        private DateTime NH_SignInDate
        {
            get {return _SignInDate;}
            set {_SignInDate = value;}
        }
        private DateTime NH_SignOutDate
        {
            get {return _SignOutDate;}
            set {_SignOutDate = value;}
        }

        private SignLogInfo()
        {

        }

        internal SignLogInfo(string userid, string sessionid, string clientip, DateTime signdate )
        {
            this._UserID = userid;
            this._SessionID = sessionid;
            this._ClientIP = clientip;
            this._SignInDate = signdate;
            this._SignOutDate = signdate;
        }
    }
}

代码段九 影射文件  SignLogInfo.hbm.xml  这里用到上篇文章《不让NH属性器破坏封装》提到的方法

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
    <class name="CManager.NHDAL.Log.SignLogInfo, CManager.NHDAL" table="CM_SignLog">
        <id name="Id" type="Int32" unsaved-value="0">
            <column name="SignLogID" sql-type="int" not-null="true" unique="true" index="PK__CM_SignLog__79A81403"/>
            <generator class="native" />
        </id>
        <property name="NH_UserID" type="String">
            <column name="UserID" length="50" sql-type="nvarchar" not-null="true"/>
        </property>
        <property name="NH_SessionID" type="String">
            <column name="SessionID" length="24" sql-type="nvarchar" not-null="true"/>
        </property>
        <property name="NH_ClientIP" type="String">
            <column name="ClientIP" length="20" sql-type="nvarchar" not-null="true"/>
        </property>
        <property name="NH_SignInDate" type="DateTime">
            <column name="SignInDate" sql-type="datetime" not-null="true"/>
        </property>
        <property name="NH_SignOutDate" type="DateTime">
            <column name="SignOutDate" sql-type="datetime" not-null="false"/>
        </property>
    </class>
</hibernate-mapping>
代码段十 小技巧,NHObject基类
定义了一个NHObject的基类,因为任何实际操作对象is a NHObject,所以均继承这个类
这样做的好处是当我们需要更改加载连接字符串方法(比如解密)的时候只需在此出修改,还可以比较大面积地更改NH的使用方法。

using System;
using NHibernate;
using NHibernate.Cfg;

namespace CManager.NHDAL
{
    /**//// <summary>
    /// NHConfigBase 的摘要说明。
    /// </summary>
    public class NHObject
    {
        private static Configuration config = new Configuration().AddAssembly(System.Reflection.Assembly.Load("CManager.NHDAL"));
        private static ISessionFactory sessionFactory = config.BuildSessionFactory();
        protected static NHibernate.ISession CreateSession()
        {
            return sessionFactory.OpenSession();
        }
    }
}

 这样一个完整的框架就成功地搭建并运行了。:)

posted on 2007-05-01 23:48  live-evil  阅读(460)  评论(0编辑  收藏  举报

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