[.NET中三层构架开发实例-用户注册系统]

数据库基类

using System;

using System.Data;

using System.Data.SqlClient;

namespace HaiSky.HtJob

{

     ///

     /// DbClass 的摘要说明。

     ///

     public class DbClass

     {

         private string connectionString;

         protected SqlConnection Connection;

         public DbClass(string newConnectionString)

         {

             connectionString = newConnectionString;

             Connection = new SqlConnection(connectionString);

         }

         public string ConnectionString

         {

             get

             {

                 return connectionString;

             }

         }

         private SqlCommand BuildQueryCommand(string storedProcName,IDataParameter[] parameters)

         {

             SqlCommand command = new SqlCommand(storedProcName,Connection);

             command.CommandType = CommandType.StoredProcedure;

             foreach (SqlParameter parameter in parameters)

                 {

                     command.Parameters.Add(parameter);

                 }

             return command;

         }

         private SqlCommand BuildIntCommand(string storedProcName,IDataParameter[] parameters)

         {

             SqlCommand command = BuildQueryCommand(storedProcName,parameters);

             command.Parameters.Add(new SqlParameter("ReturnValue",SqlDbType.Int,4,

                 ParameterDirection.ReturnValue,false,

                 0,

                 0,

                 string.Empty,DataRowVersion.Default,null));

             return command;        

         }

         protected int RunProcedure(string storedProcName,IDataParameter[] parameters,out int rowsAffected)

         {

             int result;

             Connection.Open();

             SqlCommand command = BuildIntCommand(storedProcName,parameters);

             rowsAffected = command.ExecuteNonQuery();

             result = (int)command.Parameters["ReturnValue"].Value;

             Connection.Close();

             return result;

         }

         protected SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )

         {

             SqlDataReader returnReader;

             Connection.Open();

             SqlCommand command = BuildQueryCommand( storedProcName, parameters );

             command.CommandType = CommandType.StoredProcedure;

             returnReader = command.ExecuteReader();

             return returnReader;

         }

         protected DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )

         {

             DataSet dataSet = new DataSet();

             Connection.Open();

             SqlDataAdapter sqlDA = new SqlDataAdapter();

             sqlDA.SelectCommand = BuildQueryCommand( storedProcName, parameters );

             sqlDA.Fill( dataSet, tableName );

             Connection.Close();

             return dataSet;

         }

         protected void RunProcedure(string storedProcName, IDataParameter[] parameters, DataSet dataSet, string tableName )

         {

             Connection.Open();

             SqlDataAdapter sqlDA = new SqlDataAdapter();

             sqlDA.SelectCommand = BuildIntCommand( storedProcName, parameters );

             sqlDA.Fill( dataSet, tableName );

             Connection.Close();            

         }

     }

}

商务层基类（逻辑层）

using System;

namespace Wrox.WebModules.Business

{

     public class BizObject

     {

         public BizObject()

         {             }

     }

}

下面是用户注册系统开发的三层构架实例：数据库基类采用上面提供的代码。

1、     用户注册模块数据层开发：

using System;

using System.Data;

using System.Data.SqlClient;

using HaiSky.HtJob;

using System.Xml;

namespace HaiSky.HtJob.Accounts.AccountsData

{

     public class User : HaiSky.HtJob.HaiSkyDbObject

     {

         public User(string newConnectionString) : base(newConnectionString)

         {//直接路由连接字符串}

         public int Create(string user_nm,string user_pwd)

         {

             int rowsAffected;

             SqlParameter[] parameters = {new SqlParameter("@user_nm",SqlDbType.Char,16),

                                         new

SqlParameter("@user_pwd",SqlDbType.Char,16)};

             parameters[0].Value = user_nm;

             parameters[1].Value = user_pwd;

             parameters[2].Direction = ParameterDirection.Output;

             try

             {

                 RunProcedure("IF_user_info",parameters,out rowsAffected);

             }

             catch

             {     }

             return (int)parameters[2].Value;

         }

     }

}

2、用户注册商务层开发：

using System;

using System.Configuration;

using HaiSky.HtJob.Accounts.AccountsData;

namespace HaiSky.HtJob.Accounts.AccountBusiness

{

     public class User : HaiSky.HtJob.HaiSkyBizObject

     {

         int userID;

         string userName;

         string userPwd;

         string strConn;

         public User()

         {

             strConn = ConfigurationSettings.AppSettings["strConn"];

         }

         public int Careate()

         {

             AccountsData.User dataUser = new AccountsData.User(strConn);

             userID = dataUser.Create(userName,userPwd);

             return userID;

         }

         public int UserID

         {

             get

             {

                 return userID;

             }

             set

             {

                 userID = value;

             }

         }

         public string UserName

         {

             get

             {

                 return userName;

             }

             set

             {

                 userName = value;

             }

         }

         public string UserPwd

         {

             get

             {

                 return userPwd;

             }

             set

             {

                 userPwd = value;

             }

         }

     }

}

3、     用户注册表示层开发：

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 HaiSky.HtJob.Accounts.AccountBusiness;

namespace HaiSky.HtJob.Modules.Accounts

{

     public class Register : System.Web.UI.Page

     {

         protected System.Web.UI.WebControls.TextBox TextBox1;

         protected System.Web.UI.WebControls.TextBox TextBox2;

         protected System.Web.UI.WebControls.Table Table1;

         protected System.Web.UI.WebControls.Button Button1;

         private void Page_Load(object sender, System.EventArgs e)

         {

             Table1.Rows[0].Cells[0].Visible = false;

         }

         #region Web Form Designer generated code

         override protected void OnInit(EventArgs e)

         {

             InitializeComponent();

             base.OnInit(e);

         }    

         private void InitializeComponent()

         {    

             this.Button1.Click += new System.EventHandler(this.Button1_Click);

             this.Load += new System.EventHandler(this.Page_Load);

         }

         #endregion

         private void Button1_Click(object sender, System.EventArgs e)

         {

             int i;

             HtJob.Accounts.AccountBusiness.User BusinessUser = new HtJob.Accounts.AccountBusiness.User();

             BusinessUser.UserName = TextBox1.Text;

             BusinessUser.UserPwd = TextBox2.Text;

             i = BusinessUser.Careate();

             Response.Write (i.ToString());                          //这里输出返回值

         }

     }

}

4、     该系统调用的存储过程：

CREATE PROCEDURE IF_user_info

(@user_nm char(16),@user_pwd char(16),@user_ID int output)

AS

     insert user_info(user_nm,user_pwd) values(@user_nm,@user_pwd)

set @user_ID = @@identity

     IF @@ERROR > 0

         BEGIN

         RAISERROR (Insert of Article failed, 16, 1)

         RETURN 99

     END

GO