ASP.net+SQL server2008简单的数据库增删改查 VS2012

工具：VS2012

数据库：SQL server

简单说明：根据老师上课给的代码，进行了简单的改正适用于VS2012环境，包括注册、登录、查询、修改、删除功能，多数参考了网上的代码

百度云源代码连接testDAO：http://pan.baidu.com/s/1c0CTRgs

遇见的问题：

1、字符文本中字符太多: 在html中用的<a href=" ">,在.NET中需要把双引号变成单引号，javascript中的部分双引号也需变成单引号，此处代码详见register.aspx

2、如何javascript获取表格中的行数：通过varx=document.getElementById("表格id");找到table，x.rows[].cells[]即可找到第几行第几列     此处代码详见register.aspx的javascript代码

3、如何通过asp获取url中参数的值：http://localhost:30965/testDAO/list.aspx？username=16&psaaword=21

String x= Request.QueryString["username"];即可获得username的值16

文件结构如右图所示

数据库名字：easylife  表的名字：table_user  表内容如图：

界面如下图所示：

DBHelper.cs代码：在每一个对象的数据库访问类中：1、数据库连接反复出现  2、数据库连接打开和关闭反复出现  3、执行Sql语句的方法相似

因此，定义DBHelper类，封装常用的方法

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Data.SqlClient; 

 /// <summary>
 /// DBHelper 的摘要说明
 /// </summary>
 namespace testDAO.Library
 {
     public class DBHelper
     {//server=.;Trusted_Connection=SSPI;database=easylife
         private String connectionString = "server=.;database=easylife;uid=sa;pwd=root";

         public SqlDataReader ExecuteReader(String sql)
         {
             SqlConnection connection = new SqlConnection(connectionString);
             connection.Open();

             SqlCommand command = new SqlCommand(sql,connection);

             SqlDataReader result = command.ExecuteReader();

             return result;
         }

         public bool ExecuteCommand(String sql)
         {
             bool result = false;

             try
             {
                 SqlConnection connection = new SqlConnection(connectionString);
                 connection.Open();

                 SqlCommand command = new SqlCommand(sql,connection);
                 //command.Connection = connection;
                 //command.CommandText = sql;
                 command.ExecuteNonQuery();

                 connection.Close();

                 result = true;
             }
             catch (Exception e)
             {
                 throw e;
             }

             return result;
         }

     }
 }

定义User类封装用户信息  User.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// User 的摘要说明
/// </summary>
namespace testDAO.Library
{
    public class User
    {
        private String userName = "";
        private String userLogin = "";
        private String userPwd = "";

        public String UserName
        {
            get
            {
                return userName;
            }
            set
            {
                userName = value;
            }
        }

        public String UserLogin
        {
            get
            {
                return userLogin;
            }
            set
            {
                userLogin = value;
            }
        }

        public String UserPwd
        {
            get
            {
                return userPwd;
            }
            set
            {
                userPwd = value;
            }
        }
    }
}

 采用UserService实现将用户信息的数据库操作 UserService.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;

 using System.Data.SqlClient;
 /// <summary>
 /// UserService 的摘要说明
 /// </summary>
 namespace testDAO.Library
 {
     public class UserService
     {
         public bool AddUser(User user)
         {
             bool result = false;
             String sql = "";

             sql = "insert into table_user (userName,userLogin,userPwd)values(";
             sql += "'" + user.UserName + "',";
             sql += "'" + user.UserLogin + "',";
             sql += "'" + user.UserPwd + "'";
             sql += ")";

             DBHelper helper = new DBHelper();
             result = helper.ExecuteCommand(sql);
             return result;

         }

         public User GetUserByLogin(User user)
         {
             String sql = "";

             sql = "select * from table_user where userLogin='" + user.UserLogin + "'";

             DBHelper helper = new DBHelper();
             SqlDataReader reader = helper.ExecuteReader(sql);
             User result = new User();
             if (reader.Read())
             {

                 result.UserName = reader.GetString();
                 result.UserLogin = reader.GetString();
                 result.UserPwd = reader.GetString();

             }
             else
             {
                 return null;
             }

             return result;
         }

         public List<User> GetAllUsers()
         {
             String sql = "";

             sql = "select * from table_user";

             DBHelper helper = new DBHelper();
             SqlDataReader reader = helper.ExecuteReader(sql);

             if (!reader.HasRows)
             {
                 return null;
             }

             List<User> list = new List<User>();
             while (reader.Read())
             {
                 User item = new User();

                 item.UserName = reader.GetString();
                 item.UserLogin = reader.GetString();
                 item.UserPwd = reader.GetString();

                 list.Add(item);
             }

             return list;
         }

         public bool DeleteUsers(String i)
         {
             bool result = false;
             String sql = "";
             sql = "delete  from table_user where userLogin ='"+ i+" '" ;
             DBHelper helper = new DBHelper();
             result = helper.ExecuteCommand(sql);
             return result;
         }

         public bool UpdateUsers(User user)
         {
             bool result = false;
             String sql = "";
             sql = "update table_user set userName= '" + user.UserName + "',userPwd='" + user.UserPwd + " '  where userlogin='" + user.UserLogin + " '";
           //  update  table_user set userName='1',userPwd='1' where userLogin='5'
             DBHelper helper = new DBHelper();
             result = helper.ExecuteCommand(sql);
             return result;
         }

     }
 }

业务逻辑层UserManager.cs，是表示层与数据访问层的桥梁 ，用于完成逻辑判断、业务处理、数据传递等操作。

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;

 /// <summary>
 /// UserManager 的摘要说明
 /// </summary>
 namespace testDAO.Library
 {
     public class UserManager
     {
         public bool AddUser(User user)
         {
             UserService service = new UserService();
             User temp = service.GetUserByLogin(user);

             if (temp != null)
             {
                 return false;
             }

             bool result = service.AddUser(user);
             return result;
         }

         public bool Login(User user)
         {
             bool result = false;

             UserService service = new UserService();

             User temp = service.GetUserByLogin(user);
             if (temp == null)
             {
                 result = false;
             }
             else if (user.UserPwd.Equals(temp.UserPwd))
             {
                 result = true;
             }

             return result;
         }

         public List<User> GetAllUsers()
         {
             UserService service = new UserService();
             return service.GetAllUsers();
         }
         public bool DeleteUser(User user)
         {
             UserService service = new UserService();

             bool result = service.DeleteUsers(user.UserLogin);
             return result;

         }

         public bool UpdateUser(User user)
         {
             UserService service = new UserService();
             bool result = service.UpdateUsers(user);
             return result;
         }
     }
 }

注册界面代码regeister.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="register.aspx.cs" Inherits="register" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">

    <div>
        <br />
        <asp:Label ID="Label1" runat="server" Text="姓名："></asp:Label>
        <asp:TextBox ID="nameText" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Label ID="Label2" runat="server" Text="帐号："></asp:Label>
        <asp:TextBox ID="loginText" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Label ID="Label3" runat="server" Text="密码："></asp:Label>
        <asp:TextBox ID="pwdText" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="注册" />
        <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="转向登录" />
    </div>
    </form>
</body>
</html>

注册界面逻辑代码 regeister.aspx.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using System.Data.SqlClient;
 using testDAO.Library;

     public partial class register : System.Web.UI.Page
     {
         protected void Page_Load(object sender, EventArgs e)
         {

         }

         public void CreateTable()
         {
             String connectionString = "server=.;Trusted_Connection=SSPI;database=easylife";
             SqlConnection connection = new SqlConnection(connectionString);
             connection.Open();
             SqlCommand command = new SqlCommand();
             command.Connection = connection;
             command.ExecuteNonQuery();
             connection.Close();
         }
         protected void Button1_Click(object sender, EventArgs e)
         {
             String userName = nameText.Text;
             String userLogin = loginText.Text;
             String userPwd = pwdText.Text;

             User user = new User();
             user.UserName = userName;
             user.UserLogin = userLogin;
             user.UserPwd = userPwd;

             bool result = false;
             UserManager manager = new UserManager();
             result = manager.AddUser(user);
             Response.Write(result);
             if (result)
             {
                 Response.Write("注册成功");
             }
             else
             {
                 Response.Write("注册失败");
             }
         }
         protected void Button2_Click(object sender, EventArgs e)
         {
             Response.Redirect("login.aspx");
         }
     }

regeister.aspx.cs

登录界面代码 login.aspx

 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="login.aspx.cs" Inherits="login" %>

 <!DOCTYPE html>

 <html xmlns="http://www.w3.org/1999/xhtml">
 <head runat="server">
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     <title></title>
 </head>
 <body>
     <form id="form1" runat="server">
     <div>
         <br />
         <asp:Label ID="Label1" runat="server" Text="帐号："></asp:Label>
         <asp:TextBox ID="loginText" runat="server"></asp:TextBox>
         <br />
         <br />
         <asp:Label ID="Label2" runat="server" Text="密码："></asp:Label>
         <asp:TextBox ID="pwdText" runat="server"></asp:TextBox>
         <br />
         <br />
         <asp:Button ID="loginButton" runat="server" onclick="loginButton_Click"
             Text="登录" />
         <asp:Button ID="Button1" runat="server" Text="转向注册" OnClick="Button1_Click" />
     </div>
     </form>
 </body>
 </html>

login.aspx

 

登录界面逻辑代码 login.aspx.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using testDAO.Library;

 public partial class login : System.Web.UI.Page
 {
     protected void Page_Load(object sender, EventArgs e)
     {

     }
     protected void Button1_Click(object sender, EventArgs e)
     {
         Response.Redirect("register.aspx");
     }

     protected void loginButton_Click(object sender, EventArgs e)
     {
         User user = new User();    

         user.UserLogin = loginText.Text;
         user.UserPwd = pwdText.Text;

         UserManager manager = new UserManager();
         bool result = manager.Login(user);
         if (result)
         {
             Response.Redirect("list.aspx");
         }
         else
         {
             Response.Write("登录失败,请输入正确的用户名和密码");
         }

     }
 }

login.aspx.cs

显示界面代码：

显示界面相关说明：

显示界面图片是这样：

当点击修改时图片如下：

点击修改时通过table获得table中的行数，从而改变行数中相应的内容，相关代码在javascript中

参数传值通过URL获取

 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="list.aspx.cs" Inherits="list" %>

 <%@ Import Namespace="testDAO.Library" %>
 <!DOCTYPE html>

 <html xmlns="http://www.w3.org/1999/xhtml">
 <head runat="server">
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     <title></title>
 </head>
 <body>
     <form id="form1" runat="server">
     <div>
         <table id="test" width="" align="center" border = "" cellpadding="" cellspacing="" bordercolordark="#808080" bordercolorlight="#ffffff" >
 <tr>
   <td align="center">序号</td>
   <td align="center">姓名</td>
   <td align="center">帐号</td>
   <td align="center">密码</td>
   <td align="center">修改</td>
   <td align="center">删除</td>
 </tr>
 <%
     UserManager manager = new UserManager();
     List<User> list = manager.GetAllUsers();

     for (int i = ; i < list.Count; i++)
     {
         Response.Write("<tr >");
         Response.Write("<td align='center'>" + i + "</td>");
         Response.Write("<td align='center'>" + list[i].UserName + "</td>");
         Response.Write("<td align='center' id='loginText'>" + list[i].UserLogin + "</td>");
         Response.Write("<td align='center'>" + list[i].UserPwd + "</td>");

         Response.Write("<td align='center'><input type='Button' value='修改' onclick='test1("+i+")'  >修改</td>");
         Response.Write("<td align='center'><a href='userDelete.aspx?userLogin=" + list[i].UserLogin + "'>删除</a></td>");

         Response.Write("</tr>");
     }
 %>
 </table>
         <asp:Button ID="button" runat="server" Text="转向注册" OnClick="Button1_Click" />

     </div>
     </form>
     <script type="text/javascript">

         function test1(j)
         {
             var table = document.getElementById("test");
             table.rows[j + ].cells[].innerHTML = "<input type='text' id='nameText' >";
             table.rows[j + ].cells[].innerHTML = "<input type='text' id='pwdText' >";
             table.rows[j + ].cells[].innerHTML="<input type='button' value='确定' onclick='tiaozhuan("+j+")' >"

         }
         function tiaozhuan(i) {
             var table = document.getElementById("test");
             var userName=document.getElementById("nameText").value;
             var userPwd = document.getElementById("pwdText").value;
             var userLogin=table.rows[i + ].cells[].innerHTML;

             location.href="userUpdate.aspx?userName="+ userName+"&userPwd="+userPwd+"&userLogin="+userLogin+" ";
         }
         </script>
 </body>
 </html>

list.aspx

list.aspx.cs代码只有通过点击button按钮转向到注册页面，对其它功能并无影响

通过点击修改进行更新逻辑代码 UserUpdate.aspx.cs代码

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using testDAO.Library;

 public partial class userUpdate : System.Web.UI.Page
 {
     protected void Page_Load(object sender, EventArgs e)
     {

      User user = new User();

      user.UserName= Request.QueryString["userName"];
      user.UserLogin = Request.QueryString["userLogin"];
      user.UserPwd = Request.QueryString["userPwd"];
      UserManager manager = new UserManager();
      bool result = manager.UpdateUser(user);
      if (result)
      {
          Response.Redirect("list.aspx");
      }
      else
      {
          Response.Write("修改失败");
      }

     }
 }

通过点击删除进行删除逻辑代码 userDelete.aspx.cs代码

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using testDAO.Library;
 public partial class userDelete : System.Web.UI.Page
 {
     protected void Page_Load(object sender, EventArgs e)
     {
         User user = new User();

         user.UserLogin = Request.QueryString["userLogin"];

         UserManager manager = new UserManager();
         bool result = manager.DeleteUser(user);
         if (result)
         {
             Response.Redirect("list.aspx");
         }
         else
         {
             Response.Write("删除失败");
         }

     }
 }