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방금 C#에서 프로그래밍을 시작했고 응용 프로그램/웹 사이트를 세 가지 다른 레이어로 나누는 것에 대한 정보를 읽는 것이 가장 좋은 방법 이었지만 정확히 어떻게하는지 잘 이해하지 못했습니다. 임씨는 C#에 대해 좀 더 의지 할 애완 동물 프로젝트를 진행하고 있지만 나쁜 습관을 시작하고 싶지는 않습니다. 내가 가지고있는 것을 보면서 내가이 일을 제대로하고 있는지 볼 수 있니? 모든 것을 여러 레이어로 나누는 방법에 대한 몇 가지 힌트 제안을 제공 하시겠습니까?프리젠 테이션, 비즈니스 및 데이터 레이어
프리젠 테이션 레이어
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Project: Ruth</title>
<link href="CSS/StyleSheet.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div class="Body">
<div class="Header">
<div class="Nav">
<img src="images/Header_Main.gif" alt="" width="217" height="101" />
<div class="Menu">
<a href="Default.aspx">
<img src="images/Header_Home-Off.gif" alt="" /></a>
<a href="Default.aspx">
<img src="images/Header_About-Off.gif" alt="" /></a>
<a href="Register.aspx">
<img src="images/Header_Register-Off.gif" alt="" /></a>
<a href="Default.aspx">
<img src="images/Header_Credits-Off.gif" alt="" /></a>
</div>
</div>
</div>
<div class="Content">
<div class="CurrentlyListening">
<asp:Label ID="lblCurrentListen" runat="server" Text="(Nothing Now)" CssClass="Txt"></asp:Label>
</div>
<asp:GridView ID="gvLibrary" runat="server" AutoGenerateColumns="False" DataKeyNames="lib_id" DataSourceID="sdsLibrary" EmptyDataText="There are no data records to display." Width="760" GridLines="None">
<RowStyle CssClass="RowStyle" />
<AlternatingRowStyle CssClass="AltRowStyle" />
<HeaderStyle CssClass="HeaderStyle" />
<Columns>
<asp:BoundField DataField="artist_name" HeaderText="Artist" SortExpression="artist_name" HeaderStyle-Width="200" />
<asp:BoundField DataField="album_title" HeaderText="Album" SortExpression="album_title" HeaderStyle-Width="200" />
<asp:BoundField DataField="song_title" HeaderText="Track" SortExpression="song_title" HeaderStyle-Width="200" />
<asp:TemplateField HeaderText="DL">
<ItemTemplate>
<a href="http://####/Proj_Ruth/Data/<%# Eval("file_path") %>" class="lnk">Link</a>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="sdsLibrary" runat="server" ConnectionString="<%$ ConnectionStrings:MusicLibraryConnectionString %>" DeleteCommand="DELETE FROM [Library] WHERE [lib_id] = @lib_id" InsertCommand="INSERT INTO [Library] ([artist_name], [album_title], [song_title], [file_path]) VALUES (@artist_name, @album_title, @song_title, @file_path)" ProviderName="<%$ ConnectionStrings:MusicLibraryConnectionString.ProviderName %>" SelectCommand="SELECT [lib_id], [artist_name], [album_title], [song_title], [file_path] FROM [Library] ORDER BY [artist_name], [album_title]" UpdateCommand="UPDATE [Library] SET [artist_name] = @artist_name, [album_title] = @album_title, [song_title] = @song_title, [file_path] = @file_path WHERE [lib_id] = @lib_id">
<DeleteParameters>
<asp:Parameter Name="lib_id" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="artist_name" Type="String" />
<asp:Parameter Name="album_title" Type="String" />
<asp:Parameter Name="song_title" Type="String" />
<asp:Parameter Name="file_path" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="artist_name" Type="String" />
<asp:Parameter Name="album_title" Type="String" />
<asp:Parameter Name="song_title" Type="String" />
<asp:Parameter Name="file_path" Type="String" />
<asp:Parameter Name="lib_id" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
</div>
</div>
</form>
</body>
</html>
비즈니스 계층
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
public class User
{
DA da = new DA();
public string FirstName { get; set; }
public string LastName { get; set; }
public string EmailAddress { get; set; }
public string Password { get; set; }
public string AccessCode { get; set; }
public User(string firstName, string lastName, string emailAddress, string password, string accessCode)
{
FirstName = firstName;
LastName = lastName;
EmailAddress = emailAddress;
Password = password;
AccessCode = accessCode;
}
public void CreateUser(User newUser)
{
if (da.IsValidAccessCode(newUser.AccessCode))
{
da.CreateUser(newUser);
}
}
}
데이터 액세스 계층 (DAL)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlTypes;
using System.Data.SqlClient;
using System.Configuration;
public class DA
{
public DA()
{
}
public bool IsValidAccessCode(string accessCode)
{
bool isValid = false;
int count = 0;
using (SqlConnection sqlCnn = new SqlConnection(ConfigurationManager.ConnectionStrings["MusicLibraryConnectionString"].ConnectionString))
{
sqlCnn.Open();
using (SqlCommand sqlCmd = new SqlCommand(String.Format("SELECT COUNT(*) FROM [AccessCodes] WHERE [accessCode_accessCode] = '{0}';", accessCode), sqlCnn))
{
count = (int)sqlCmd.ExecuteScalar();
if (count == 1)
{
isValid = true;
}
}
}
return isValid;
}
public void CreateUser(User newUser)
{
using (SqlConnection sqlCnn = new SqlConnection(ConfigurationManager.ConnectionStrings["MusicLibraryConnectionString"].ConnectionString))
{
sqlCnn.Open();
using (SqlCommand sqlCmd = new SqlCommand(String.Format("INSERT INTO [Users] (user_firstName, user_lastName, user_emailAddress, user_password, user_accessCode) VALUES ('{0}', '{1}', '{2}', '{3}', '{4}');", newUser.FirstName, newUser.LastName, newUser.EmailAddress, newUser.Password, newUser.AccessCode), sqlCnn))
{
sqlCmd.ExecuteNonQuery();
}
}
DeleteAccessCode(newUser.AccessCode);
}
public void DeleteAccessCode(string accessCode)
{
using (SqlConnection sqlCnn = new SqlConnection(ConfigurationManager.ConnectionStrings["MusicLibraryConnectionString"].ConnectionString))
{
sqlCnn.Open();
using (SqlCommand sqlCmd = new SqlCommand(String.Format("DELETE FROM [AccessCodes] WHERE [accessCode_accessCode] = '{0}';", accessCode), sqlCnn))
{
sqlCmd.ExecuteNonQuery();
}
}
}
}
아마도 주제를 벗어나지 만 DAL의 예에서 연결을 닫아야합니까? –
위의 코드를 어떻게 평가할 수 있습니까? –
@ 존 : 연결을 처리하지 않는 "using 구문"을 사용하기 때문에 명시 적으로 닫을 필요가 없습니다. 즉, 명확성을 위해 닫으십시오. – Cerebrus