投票系统前台 C#，数据库SQL

------------vote.aspx.cs--------------------
  private void Page_Load(object sender, System.EventArgs e)   {    // 在此处放置用户代码以初始化页面    if(!Page.IsPostBack)    {     SqlConnection con=db.createrConnection();     con.Open();     SqlCommand cmd=new SqlCommand("select votetitle from votemaster where voteid="+this.idd,con);     string title=Convert.ToString(cmd.ExecuteScalar());     this.title.Text=title;     cmd.CommandText="select * from vote where voteid="+this.idd;     SqlDataReader sdr=cmd.ExecuteReader();     this.rad.DataSource=sdr;     this.rad.DataTextField="voteitem";     this.rad.DataValueField="id";     this.rad.DataBind();     sdr.Close();     con.Close();    }   } 窗体代码 private void tp_Click(object sender, System.EventArgs e)   {   SqlConnection con=db.createrConnection();   con.Open();   SqlCommand cmd=new SqlCommand();   cmd.Connection=con;   cmd.CommandText="update vote set votenun=votenun+1 where voteid="+this.idd+" and id="+this.rad.SelectedValue.ToString();   cmd.ExecuteNonQuery();  con.Close();

}

private void show_Click(object sender, System.EventArgs e)   {    Response.Redirect("show.aspx?voteid="+this.idd);   }  } } ---------------------完----------vote.aspx -----------------

Label

------------------------------完-----------db.cs-----------------------

// TODO: 在此处添加构造函数逻辑
   //
  }
  public static SqlConnection createrConnection()
  {
 SqlConnection con=new SqlConnection("server=.;database=vote;uid=sa;pwd=980123");
  return con;
  }
 }
}
------------------------show.aspx.cs--------------------------
private void Page_Load(object sender, System.EventArgs e)
  {
   string id=Request.QueryString["voteid"].ToString();
   SqlConnection con=db.createrConnection();
   con.Open();
   SqlCommand cmd=new SqlCommand("select * from vote where voteid="+id,con);
   SqlDataReader sdr=cmd.ExecuteReader();
   while (sdr.Read())
  {
  Response.Write(sdr.GetString(2)+"--"+sdr.GetInt32(3).ToString());
  }
---------------------完-------------sql文件------------------

create database vote

use vote

create table votemaster ( voteid int primary key,--投票编号 votetitle varchar(100) not null,--投票标题 votesum int default 0 --投票的总票数 )

insert into votemaster values(1,'书记选举',0) insert into votemaster values(2,'市长选举',0)

select * from votemaster

create table vote (  voteid int foreign key references votemaster(voteid),--该键是主表的联系键  id int not null,  voteitem varchar(20) not null,  votenun int default 0, )

insert into vote values(1,1,'张三',0) insert into vote values(1,2,'李达',0) insert into vote values(1,3,'钟馗',0) insert into vote values(1,4,'江尚',0) insert into vote values(2,1,'刘文采',0) insert into vote values(2,2,'李世民',0) insert into vote values(2,3,'周正',0) insert into vote values(2,4,'张三疯',0)

select * from vote where voteid=2

create trigger updatemaster--这里是触发器 on vote for update as begin   update votemaster set votesum=votesum+1 where voteid=(select top 1 voteid from inserted) end

update vote set votenun=votenun+1 where voteid=2 and id=2
------------------------------完--------------------