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用VS2010做一个增删改查的小程序

时间：2014-08-09 23:38    点击：次

整个程序如下：用户登录--进入用户文章页面--可对文章进行增删改
首先打开VS2010 文件--新建--网站

确定

接着是数据库，这里用SQL2005
选择window验证登陆方式



进入数据库，点新建查询，建库加建表

create database Test use Test create table UserInfo
(
id int primary key identity(1,1), 
username varchar(20),
password varchar(20)
) create table Article
(
id int primary key identity(1,1), 
title varchar(50),
content varchar(100),
uid int FOREIGN KEY REFERENCES UserInfo(id)
) 
insert into UserInfo values('test','123')



最后一句插入一条数据，用户名为test 密码为123

下面回到VS2010

在所选位置右键添加新项--选择类--名称定义为DBcon.cs
这时会提示是否放入APP_Code文件夹，选择是，就自动建了个文件夹，次文件夹只放类文件


双击DBcon.cs
添加代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
/// <summary>
///DBcon 的摘要说明
/// </summary>
public class DBcon
{
private static SqlConnection sqlcon;
public DBcon()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
public static SqlConnection getconnection()
{
sqlcon = new SqlConnection("Data Source=.;Integrated Security=SSPI;Initial Catalog=Test"); 
return sqlcon; 
} 
}





还有另一条SQL验证登录的语句
sqlcon = new SqlConnection("server=.;uid=sa;pwd=123456;database=Test");


在项目新建一个web窗体 名称为Login.aspx
里面有个对应的cs文件 叫Login.aspx.cs
打开它

在 protected void Page_Load(object sender, EventArgs e)
{ }里添加如下代码，目的只是测试数据库是否能连接上

protected void Page_Load(object sender, EventArgs e)
{
SqlConnection sqlcon = DBcon.getconnection();
sqlcon.Open();
if (sqlcon.State == ConnectionState.Open)
Response.Write("数据库连接成功");
}

运行一下，如果窗体显示 数据库连接成功成功 那就是成功了
然后上面里面的代码也可以删除了


接着就是布局了，一个登录的页面很简单，拖拖控件就OK，但最好还是动手写代码
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr><td>用户名：</td><td><asp:TextBox ID="txtusername" runat="server"></asp:TextBox></td></tr>
<tr><td>密码：</td><td><asp:TextBox ID="txtpassword" runat="server" TextMode="Password"></asp:TextBox></td></tr>
<tr><td colspan="2">
<asp:Button ID="btnLogin" runat="server" Text="登录" /></td></tr>
</table>
</div>

</form>
</body>
</html>


很简单的布局

双击按钮 进入事件代码

注：可能设计界面显示不出控件，这时候需要手动加代码
<asp:Button ID="btnLogin" runat="server" Text="登录" onclick="btnLogin_Click"/>

Login.aspx.cs如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient; public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void btnLogin_Click(object sender, EventArgs e)
{
if(this.txtusername.Text.Trim()=="" || this.txtpassword.Text.Trim()=="")
Response.Write("<script>alert('用户名或密码不能为空')</script>");
}
}



App_Code文件夹需要添加两个cs文件 Method.cs 和TestService.cs

Method.cs 如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient; /// <summary>
///Method 的摘要说明
/// </summary>
public class Method
{
public Method()
{
//
//TODO: 在此处添加构造函数逻辑
//
} /// <summary>
/// 对数据插入，更改,删除方法
/// </summary>
/// <param name="sql">SQL语句</param>
public static void DataMethod(string sql)
{
SqlConnection mycon = DBcon.getconnection();
mycon.Open();
SqlCommand cmd = new SqlCommand(sql, mycon);
try
{
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
throw (ex);
}
finally
{
mycon.Dispose();
mycon.Close();
}
}


/// <summary>
/// 检查数据
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static bool DataCheak(string sql)
{
SqlConnection mycon = DBcon.getconnection();
mycon.Open();
SqlCommand cmd = new SqlCommand(sql, mycon);
SqlDataReader dr = cmd.ExecuteReader();
bool b = false;
if (dr.Read())
{
b = true;
}
dr.Dispose();
cmd.Dispose();
mycon.Dispose(); return b; } /// <summary>
/// 以DataSet获取数据
/// </summary>
/// <param name="sql"></param>
/// <param name="table"></param>
/// <returns></returns>
public static DataSet GetData(string sql, string table)
{
SqlConnection mycon = DBcon.getconnection();
SqlCommand cmd = new SqlCommand(sql, mycon);
try
{
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds, table);
return ds;
}
catch (Exception ex)
{
throw (ex);
}
finally
{
mycon.Dispose();
mycon.Close();
}
} 
public static SqlDataReader GetData(string sql)
{
SqlConnection mycon = DBcon.getconnection();
mycon.Open();
SqlCommand cmd = new SqlCommand(sql, mycon);
try
{
SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return dr;
}
catch (Exception ex)
{
throw (ex);
} 
}
}


TestService.cs如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient; /// <summary>
///TestService 的摘要说明
/// </summary>
public class TestService
{
public TestService()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
public Boolean Login(string username,string password) 
{
String sql = "select * from UserInfo where username='"+username+"' and password='"+password+"'";
if (Method.DataCheak(sql))
return true;
else
return false; }
public DataSet ShowList(int Userid)
{
String sql = "select * from Article where uid="+Userid+"";
DataSet ds = Method.GetData(sql, "list");
return ds; } public DataSet GetUser(string username, string password)
{
String sql = "select * from UserInfo where username='"+username+"' and password='"+password+"'";
DataSet ds = Method.GetData(sql, "UserInfo");
return ds; } public void Add(string title, string content,int uid)
{
String sql = string.Format("insert into Article values('{0}','{1}',{2})", title, content, uid);
Method.DataMethod(sql);
} public SqlDataReader GetOneList(int id)
{
String sql = "select * from Article where id="+id+"";
SqlDataReader dr = Method.GetData(sql);
return dr;
} public void Update(string title, string content, int id)
{
String sql = "update Article set title='" + title + "',content='" + content + "' where id=" + id + " ";
Method.DataMethod(sql);
} public void Delete(int id)
{
String sql = "delete from Article where id=" + id + " ";
Method.DataMethod(sql);
} }


Login.aspx.cs 最终如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient; public partial class Login : System.Web.UI.Page
{
TestService ts = new TestService();
protected void Page_Load(object sender, EventArgs e)
{

}
protected void btnLogin_Click(object sender, EventArgs e)
{
if(this.txtusername.Text.Trim()=="" || this.txtpassword.Text.Trim()=="")
Response.Write("<script>alert('用户名或密码不能为空')</script>");
else if (!ts.Login(this.txtusername.Text.Trim(), this.txtpassword.Text.Trim()))
Response.Write("<script>alert('用户名或密码错误')</script>");
else
{
DataSet ds = ts.GetUser(this.txtusername.Text.Trim(), this.txtpassword.Text.Trim());
Session["UID"] = Convert.ToInt32(ds.Tables["UserInfo"].Rows[0][0].ToString());
Session["Username"] = ds.Tables["UserInfo"].Rows[0][1].ToString();
Response.Write("<script>alert('登录成功');location.href='ArticleList.aspx'</script>");
} }
}



添加页面ArticleList.aspx 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ArticleList.aspx.cs" Inherits="ArticleList" %> <!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></title>
</head>
<body>
<form id="form1" runat="server">
<p>用户名：<asp:Label ID="Label1" runat="server" Text=""></asp:Label></p>
<div>
文章标题
<asp:DataList ID="Dl_List" runat="server" DataKeyField="id" 
onitemcommand="Dl_List_ItemCommand">
<ItemTemplate>
<a href="Update.aspx?id=<%# Eval("id")%> "> <%# Eval("title")%> </a> 
<asp:LinkButton ID="LB_Del" runat="server" CommandName="delete">删除</asp:LinkButton>
</ItemTemplate>
</asp:DataList>
</div>
<div id="sorry" style="display:none" runat="server">
<p style=" margin-left:10px;color:Red;font-weight:bold">对不起，你还没有文章</p>
</div>
<asp:LinkButton ID="LB_Add" runat="server" onclick="LB_Add_Click" >添加</asp:LinkButton>
</form>
</body>
</html>

对应代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient; public partial class ArticleList : System.Web.UI.Page
{
TestService ts = new TestService();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.Label1.Text = Session["Username"].ToString();
DLBind();
}
} public void DLBind()
{
DataSet ds = ts.ShowList(int.Parse(Session["UID"].ToString()));
this.Dl_List.DataSource = ds.Tables["List"].DefaultView;
this.Dl_List.DataBind();
if (ds.Tables[0].Rows.Count <= 0)
{
sorry.Style["display"] = "block";
}
}
protected void LB_Add_Click(object sender, EventArgs e)
{
Response.Redirect("Add.aspx");
}
protected void Dl_List_ItemCommand(object source, DataListCommandEventArgs e)
{
switch (e.CommandName)
{
case "delete":
ts.Delete(int.Parse(Dl_List.DataKeys[e.Item.ItemIndex].ToString()));
Response.Write("<script>alert('删除成功')</script>");
DLBind();
break;
}
}
}


添加页面Add.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Add.aspx.cs" Inherits="Add" %> <!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<p>添加文章</p>
标题：<asp:TextBox ID="txtTitle" runat="server"></asp:TextBox><br />
内容：<asp:TextBox ID="txtContent" runat="server" TextMode="MultiLine"></asp:TextBox><br />
<asp:Button ID="btnAdd" runat="server" Text="添加" onclick="btnAdd_Click" />
</div>
</form>
</body>
</html>


对应代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls; public partial class Add : System.Web.UI.Page
{
TestService ts = new TestService();
protected void Page_Load(object sender, EventArgs e)
{ }
protected void btnAdd_Click(object sender, EventArgs e)
{
string title=this.txtTitle.Text.Trim();
string content=this.txtContent.Text.Trim();
int uid=int.Parse(Session["UID"].ToString());
ts.Add(title, content, uid);
Response.Write("<script>alert('添加成功');location.href='ArticleList.aspx'</script>");
}
}


添加页面Update.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Update.aspx.cs" Inherits="Update" %> <!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<p>修改文章</p>
标题：<asp:TextBox ID="txtTitle" runat="server"></asp:TextBox><br />
内容：<asp:TextBox ID="txtContent" runat="server" TextMode="MultiLine"></asp:TextBox><br />
<asp:Button ID="btnUpdate" runat="server" Text="修改" onclick="btnUpdate_Click" />
</div>
</form>
</body>
</html>


对应代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient; public partial class Update : System.Web.UI.Page
{
TestService ts = new TestService();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ListBind(Convert.ToInt32(Request.QueryString["id"].ToString())); }
} public void ListBind(int id)
{
SqlDataReader dr = ts.GetOneList(id);
if (dr.Read())
{
this.txtTitle.Text = dr["title"].ToString();
this.txtContent.Text = dr["content"].ToString();
}
}
protected void btnUpdate_Click(object sender, EventArgs e)
{
ts.Update(this.txtTitle.Text, this.txtContent.Text, Convert.ToInt32(Request.QueryString["id"].ToString()));
Response.Write("<script>alert('修改成功');location.href='ArticleList.aspx'</script>");
}
}



OK 完成

来源：幻想编程//所属分类：C语言/更新时间：2014-08-09 23:38
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