网站投票系统！

旧城等待， 2022-05-25 01:54 156阅读 0赞

一、数据库脚本

需要建立两张表，脚本如下：

create table VoteTitle  --投票主题表
    (
    TitleID int identity primary key,--主题编号
    Title varchar(200) not null,--主题信息
    SumNumber int default 0,--主题的所有项目投票总数
    Mode bit default 0,--0为单选，1为复选，默认为0
    Status bit default 0--0表示关闭主题，1为打开主题，默认为0
    )
    
    go 
    insert into VoteTitle(Title,Mode,Status)values('你对我们网站评价如何？',0,1)
    insert into VoteTitle(Title,Mode,Status)values('请选择你喜欢的编程语言',0,0)
    go
    create table VoteItem--投票主题项目表
    (
    ItemID int identity primary key,--项目编号
    Item varchar(200)not null,--项目信息
    Number int default 0,--项目的投票总数
    TitleID int references VoteTitle(TitleID)on delete cascade on update cascade
    --设置级联关系，当对父表中的TtileID进行删除和更新时，会影响子表
    
    )
    go
    insert into VoteItem(Item,TitleID)values('非常好','1')
    insert into VoteItem(Item,TitleID)values('好','1')
    insert into VoteItem(Item,TitleID)values('一般','1')
    insert into VoteItem(Item,TitleID)values('差','1')
    insert into VoteItem(Item,TitleID)values('很差','1')
    
    go
    insert into VoteItem(Item,TitleID)values('asp,net web开发语言','2')
    insert into VoteItem(Item,TitleID)values('C# 窗体开发语言','2')
    insert into VoteItem(Item,TitleID)values('html页面语言','2')
    insert into VoteItem(Item,TitleID)values('JS脚本语言','2')
    go
    create trigger trigger_VoteItem on VoteItem for update--建立触发器
    as
    begin
        if update(Number)--当项目表的投票更新时
        begin
             update VoteTitle set SumNumber=SumNumber+1 where TitleID=(select TitleID from inserted)
        end
    end
    --触发器结束
    go
    select * from VoteTitle
    select * from VoteItem
    go

注意，这里只进行第一个主题的讨论，也就是说默认是让用户对网站进行评价，关于投票选择喜欢语言的主题这里不演示。  
表的效果图如下：

![1348642910_3597.jpg][]

二、页面编辑，这里有两张表，第一张是显示投票的页面ShowVote.aspx，第二张是显示投票结果的页面LookVote.aspx

ShowVote.aspx页面的代码如下：

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Data.SqlClient;
    using System.Data;
    
    namespace VoteSystem
    {
        public partial class ShowVote : System.Web.UI.Page
        {
            protected void Page_Load(object sender, EventArgs e)
            {
                Bind();
            }
            private void Bind()
    
            {  //数据库操作
                  string str="Server=.;DataBase=Exercise;uid=sa;pwd=;";
                SqlConnection conn = new SqlConnection(str);
                string sql="select * from VoteTitle where Status=1";
                SqlDataAdapter da = new SqlDataAdapter(sql, conn);
                DataSet ds = new DataSet();
                da.Fill(ds, "TitleTable");
                sql = "select *from VoteItem where TitleID=(select TitleID from VoteTitle where Status=1)";
                da = new SqlDataAdapter(sql, conn);
                da.Fill(ds, "ItemTable");
                DataView dv = ds.Tables["ItemTable"].DefaultView;
                dv.Sort = "ItemID asc";
                //获取主题
                lblTitle.Text = ds.Tables["TitleTable"].Rows[0]["Title"].ToString();
                //获取启用的主题的Mode来决定是用单选框还是复选框，这里我默认的主题是进行网站评论，那么就默认是RadiobuttonList（即单选框）
                bool Mode = Convert.ToBoolean(ds.Tables["TitleTable"].Rows[0]["Mode"]);
                hfMode.Value = Mode.ToString();
                if (Mode)
                {
                    //表示选择的是复选
                    CheckBoxList obj = new CheckBoxList();
                    obj.BackColor = System.Drawing.ColorTranslator.FromHtml("#EDEDED");
                    obj.ID = "listVoteItem";
                    obj.Width = 180;
                    obj.DataSource = dv;
                    obj.DataTextField = "Item";
                    obj.DataValueField = "ItemID";
                    obj.DataBind();
                    Panel1.Controls.Add(obj);
                }
                else
                {
                    //表示添加的是单选
                    RadioButtonList obj = new RadioButtonList();
                    obj.DataSource = dv;
                    obj.ID = "listVoteItem";
                    obj.DataTextField = "Item";
                    obj.DataValueField = "ItemID";
                    obj.DataBind();
                    Panel1.Controls.Add(obj);
                }
            }
            //投票按钮
            protected void btnVote_Click(object sender, EventArgs e)
            {
                string pass = string.Empty;
                if (Request.Cookies["pass"] == null)
                {
                    pass = "";
                }
                else
                {
                    pass = Request.Cookies["pass"].Value.ToString();//读取客户端cookies
                }
                if (pass == "pass")
                {
                    Response.Write("<script language='javascript'>alert('你每天只能投票一次');history.back();</script>");
                    Response.End();
                }
                else
                {   
                    string str = "Server=.;DataBase=Exercise;uid=sa;pwd=;";
                    SqlConnection conn = new SqlConnection(str);
                    conn.Open();
                    SqlCommand cmd = new SqlCommand();
                    cmd.CommandType = CommandType.Text;
                    cmd.Connection = conn;
                    bool Mode = Convert.ToBoolean(hfMode.Value);//hfMode是隐藏控件，用于记录Mode
                    if (Mode)
                    {
                        CheckBoxList rb = (CheckBoxList)Panel1.FindControl("listVoteItem");
                        if (rb.SelectedIndex == -1)
                        {
                            Response.Write("<script language='javascript'>alert('你必须至少选择一项！');history.back();</script>");
                            Response.End();
                        }
                        else
                        {
                            //表示用户进行了选择
                            foreach (ListItem item in rb.Items)
                            {
                                if (item.Selected)
                                {
                                    cmd.CommandText = "update VoteItem set Number=Number+1 where ItemID=" + item.Value.ToString();
                                    cmd.ExecuteNonQuery();
                                }
                            }
                            
                            Response.Cookies["pass"].Value = "pass";
                            Response.Cookies["pass"].Expires = DateTime.Now.AddDays(1);
                            Response.Write("<script language='javascript'>alert('投票成功！');history.back();</script>");
                            Response.End();
    
                        }
    
                    }
                    else
                    {
                        //表示添加的是单选
                        RadioButtonList rb = (RadioButtonList)Panel1.FindControl("listVoteItem");
                        if (rb.SelectedIndex == -1)
                        {
                           
                            Response.Write("<script language='javascript'>alert('你必须至少选择一项!');history.back();</script>");
                            Response.End();
                        }
                        else
                        {
                            //表示用户进行了选择
                            foreach (ListItem item in rb.Items)
                            {
                                if (item.Selected)
                                {
                                    cmd.CommandText = "update VoteItem set Number=Number+1 where ItemID=" + item.Value.ToString();
                                    cmd.ExecuteNonQuery();
                                }
                            }
                            Response.Cookies["pass"].Value = "pass";
                            Response.Cookies["pass"].Expires = DateTime.Now.AddDays(1);
                            Response.Write("<script language='javascript'>alert('投票成功！');history.back();</script>");
                            Response.End();
    
                        }
                        conn.Close();
                        conn.Dispose();
                    }
                }
            }
            //查看按钮
            protected void btnLook_Click(object sender, EventArgs e)
            {
                Response.Redirect("LookVote.aspx");
            }
           
        }
    }

由于LookVote.aspx页面需要有一些样式布局，毕竟要显示给用户，所以先给出Html代码，代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="LookVote.aspx.cs" Inherits="VoteSystem.LookVote" %>
    
    <!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 style="height: 382px">
            <asp:Label ID="lblInfo" runat="server" Text="lblInfo"></asp:Label>
            <br />
            <asp:Label ID="lblTitle" runat="server" Text="lblTitle"></asp:Label>
        <asp:Repeater ID="Repeater1" runat="server">
        <HeaderTemplate>
        <table style="color:#333333; text-align:left; border:0 width:90%; background-color:#b18a02;
        font-size:12px; font-family:宋体;"
        cellpadding="2" cellspacing="1">
        <tr style="height:25px; background-color:#FFFFFF; text-align:center;">
            <td style="width:50px;"> </td>
             <td style="width:170px;">选项</td>
              <td style="width:170px;">比例</td>
               <td style="width:170px;">票数</td>
        </tr>
        </HeaderTemplate>
        <ItemTemplate>
        <tr style="height:25px; background-color:#FFFFFF; text-align:left;">
        <td style=" text-align:center;"><%#DataBinder.Eval(Container.DataItem,"ItemID") %>
    
        </td>
         <td><%#DataBinder.Eval(Container.DataItem,"Item") %>
    
        </td>
         <td><%#DataBinder.Eval(Container.DataItem,"ItemPercent","<img src='Images/1.jpg' height='15' width='{0}'>") %> 
         <%#DataBinder.Eval(Container.DataItem,"ItemPercent","{0}%") %>
    
        </td>
        <td style=" text-align:center;"><%#DataBinder.Eval(Container.DataItem,"Number") %>
    
        </td>
        </tr>
        </ItemTemplate>
        <FooterTemplate>
        <tr style="height:25px; background-color:#FFFFFF; text-align:center;">
            <td colspan="4">
            <asp:LinkButton ID="LinkButton1" runat="server" OnClientClick="javascript:winow.print();return false;">[打印]
            </asp:LinkButton>
             <asp:LinkButton ID="LinkButton2" runat="server" OnClientClick="javascript:winow.close();return false;">[关闭]
            </asp:LinkButton>
            </td>
            </tr>
            </table></FooterTemplate>
        </asp:Repeater>
        </div>
        </form>
    </body>
    </html>

其中，<td><%\#DataBinder.Eval(Container.DataItem,"ItemPercent","<img src='Images/1.jpg' height='15' width='\{0\}'>") %>  <%\#DataBinder.Eval(Container.DataItem,"ItemPercent","\{0\}%") %> </td>

这个单元格实现了最核心的柱形图的显示。

下面是LookVote.aspx的后台代码：

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;
    namespace VoteSystem
    {
        public partial class LookVote : System.Web.UI.Page
        {
            protected void Page_Load(object sender, EventArgs e)
            {
                string str = "Server=.;DataBase=Exercise;uid=sa;pwd=;";
                SqlConnection conn = new SqlConnection(str);
                string sql = "select a.Title,a.SumNumber,a.Mode,a.Status,b.*,case a.SumNumber when 0 then 0 else round(cast(b.Number as float)/cast(a.SumNumber as float)*100,2) end as ItemPercent from VoteTitle a,VoteItem b where a.TitleID=b.TitleID and a.Status=1";
                SqlDataAdapter da = new SqlDataAdapter(sql, conn);
                DataSet ds = new DataSet();
                da.Fill(ds);
                Repeater1.DataSource = ds.Tables[0].DefaultView;
                Repeater1.DataBind();
                lblInfo.Text = "共有" + ds.Tables[0].Rows[0]["SumNumber"].ToString() + "人参加投票";
                lblTitle.Text = ds.Tables[0].Rows[0]["Title"].ToString();
            }
        }
    }

这部分的重点是SQL语句，string sql = "select a.Title,a.SumNumber,a.Mode,a.Status,b.\*,case a.SumNumber when 0 then 0 else round(cast(b.Number as float)/cast(a.SumNumber as float)\*100,2) end as ItemPercent from VoteTitle a,VoteItem b where a.TitleID=b.TitleID and a.Status=1";

为了求出百分比，必须将投票数（整型）转换为浮点型，避免整型除以整型=整型的错误结果。另外还需用 when 表达式 then 结果 这样的语句来描述特殊情况（因为如果投票数0的话，就不能用项目票数/主题总票数这种单一的公式来计算了）

原设计图如下：

投票页面的后台外观

![1348644439_9652.jpg][]

投票结果显示的页面外观如下：

![1348644547_7755.jpg][]

最后这个小程序的运行效果如下：

![1348645058_4238.jpg][]

![1348645063_5598.jpg][]

[1348642910_3597.jpg]: https://img-my.csdn.net/uploads/201209/26/1348642910_3597.jpg
[1348644439_9652.jpg]: https://img-my.csdn.net/uploads/201209/26/1348644439_9652.jpg
[1348644547_7755.jpg]: https://img-my.csdn.net/uploads/201209/26/1348644547_7755.jpg
[1348645058_4238.jpg]: https://img-my.csdn.net/uploads/201209/26/1348645058_4238.jpg
[1348645063_5598.jpg]: https://img-my.csdn.net/uploads/201209/26/1348645063_5598.jpg