使用 asp.net 中的超链接更新 sql 列

Question

我有一个 sql 数据源内部连接了 2 个表 (product table[product quantity column] 和 customer product table[ProductID,CustomerID,TotalProducts, UpdatedProducts])

目前我使用 sql 按钮将这段代码放在后面：

using (SqlConnection scn = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True"))
        {
            scn.Open();
            SqlCommand cmd = new SqlCommand("update o set o.Updatedproduct = p.ProductQuantity - o.Totalproduct from CustomerProducts o inner join Products p on o.ProductID = p.ProductID", scn);
            cmd.ExecuteNonQuery();
        }

虽然它工作正常并且在单击按钮时，它会更新updated products column 中的所有字段，但我想做的是使用超链接执行相同的功能。此外，它只会更新特定字段。这是一张更清晰的图像：

更新： 到目前为止，我得到了这个。 html:

   <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="btnApprove" runat="server" Text="Approve" CommandName="UpdateProduct" CommandArgument='<%#Eval("CustomerID")+","+ Eval("ProductID") %>' />
            </ItemTemplate>
        </asp:TemplateField>

后面的代码：

 protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "Approve")
        {
            using (SqlConnection scn = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True"))
            {
                scn.Open();
                SqlCommand cmd = new SqlCommand("update o set o.Updatedproduct = p.ProductQuantity - o.Totalproduct from CustomerProducts o inner join Products p on o.ProductID = p.ProductID WHERE WHERE ProductID=@ProductID", scn);
                cmd.Parameters.AddWithValue("@ProductID", ID);
                cmd.ExecuteNonQuery();
            }
        }
    }

这里什么都没有发生

Answer 1

这是一个完整的例子。希望对您有所帮助：

.ASPX：

 <asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_RowCommand" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField DataField="CustomerID" />
            <asp:BoundField DataField="ProductID" />
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:LinkButton ID="btnApprove" runat="server" Text="Approve" CommandName="UpdateProduct" CommandArgument='<%#Eval("CustomerID")+","+ Eval("ProductID") %>' />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

背后的代码：

  public partial class GridViewRowCommandExample : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if(!Page.IsPostBack)
            {
                var p1 = new Product { CustomerID = 1, ProductID = 11 };
                var p2 = new Product { CustomerID = 2, ProductID = 22 };

                GridView1.DataSource = new List<Product> { p1, p2 };
                GridView1.DataBind();
            }
        }

        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "UpdateProduct")
            {
                string[] parameters = e.CommandArgument.ToString().Split(',');
                int customerID = Int32.Parse(parameters[0]);
                int productID = Int32.Parse(parameters[1]);
                //Now that you know which row to update run the SQL update statement 
            }
        }
    }

    public class Product
    {
        public int CustomerID { get; set; }
        public int ProductID { get; set; }
    }

Answer 2

首先在 GridView 控件中放置一个带有“ButtonFieldName”的按钮字段，然后尝试 GridView 控件的 RowCommand 事件。

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "ButtonFieldName")
    {
       // Your Logic goes here
    }
}