Question

我目前正在通过C＃创建一个虚构的商店来练习ASP。

问题出在篮子里，因为每当点击第一行时（对于行删除），整个选择查询再次执行并附加到现有结果。

这对数据库没有影响，单击的其他行也能正常运行。

行（productid）的值隐藏在表单中并通过GET提交，并在另一个页面上检索，该页面删除与提交的ID相关联的购物篮数据。

购物篮页面

// #### SELECT ALL ITEMS THAT HAVE BEEN ORDERED BY THE USER #####
           queryStr = @"SELECT products.ProductImage, products.ProductName,products.ProductDesc,products.ProductPrice,purchase.ProductID, purchase.Quantity 
    FROM products, purchase
    WHERE purchase.UserID=?uid AND purchase.ProductID = products.ProductID";

            cmd = new MySql.Data.MySqlClient.MySqlCommand(queryStr, conn);
            cmd.Parameters.AddWithValue("?uid", uid);



            reader = cmd.ExecuteReader();

           // pname = "";



            while (reader.HasRows && reader.Read())
            {

                prodid = reader.GetInt32(reader.GetOrdinal("ProductID"));
                pimg = reader.GetString(reader.GetOrdinal("ProductImage"));
                pname = reader.GetString(reader.GetOrdinal("ProductName"));
                desc = reader.GetString(reader.GetOrdinal("ProductDesc"));
                price = reader.GetFloat(reader.GetOrdinal("ProductPrice"));

                if (Session["uname"] != null)
                {
                    output.InnerHtml += "<tr runat='server'><td><img src='" + pimg + "'></td><td>" + pname + "</td><td>" + desc + "</td><td>£" + price +
                        "</td><td>  <form runat='server' action='removebasketitem.aspx' method='get'><input type='hidden' ID='registerButton' runat='server' name='remove' value='" + prodid + "' /><input type='submit' ID='registerButton' runat='server' value='Remove' /></form></td></tr>";
                }
                else
                {
                Response.Redirect("index.aspx", false);
            }

删除购物篮项目页

    protected void Page_Load(object sender, EventArgs e)
    {
        int prod = Convert.ToInt32(Request.QueryString["remove"]);
        int uid = Convert.ToInt32(Session["uid"]);



        String connString = System.Configuration.ConfigurationManager.ConnectionStrings["WebAppConnString"].ToString();

        conn = new MySql.Data.MySqlClient.MySqlConnection(connString);
        conn.Open();

        queryStr = "";

        queryStr = "DELETE FROM purchase WHERE ProductID=?prod";

        cmd = new MySql.Data.MySqlClient.MySqlCommand(queryStr, conn);
        //cmd.Parameters.AddWithValue("?uid", uid);
        cmd.Parameters.AddWithValue("?prod", prod);
        cmd.ExecuteReader();

        conn.Close();



        Response.Redirect(Request.UrlReferrer.ToString());


    }

删除后，会重新返回上一页。当剩下的行工作时，有没有人知道为什么第一行以这种方式作出反应？

每次单击第一行时结果都会重复

0 个答案: