删除特定客户表C＃SQL数据库

Question

我有一个客户购物车，其中显示了客户想要购买的购物车。我要在客户购物车上删除行。

基于cust_id的购物车显示。

我正在使用此查询来显示。

SELECT 
    tableCustomerCart.cart_quantity, tableFoodDetail.food_title, 
    tableFoodDetail.food_price, tableFoodDetail.food_image, 
    tableCustomerCart.cart_price 
FROM
    tableFoodDetail 
INNER JOIN 
    tableCustomerCart ON tableFoodDetail.food_id = tableCustomerCart.cart_id 
WHERE 
    tableCustomerCart.cust_id = @cust_id

我的问题是删除特定ID（cust_id）的特定行的查询是什么？

这是我的sql数据源。

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" DeleteCommand="DELETE FROM tableCustomerCart WHERE cust_id=@cust_id" SelectCommand="SELECT tableCustomerCart.cart_quantity, tableFoodDetail.food_title, tableFoodDetail.food_price, tableFoodDetail.food_image, tableCustomerCart.cart_price FROM tableFoodDetail INNER JOIN tableCustomerCart ON tableFoodDetail.food_id = tableCustomerCart.cart_id WHERE tableCustomerCart.cust_id = @cust_id">
    <DeleteParameters>
        <asp:Parameter Name="cust_id"/>
    </DeleteParameters>
    <SelectParameters>
        <asp:SessionParameter Name="cust_id" SessionField="cust_id" />
    </SelectParameters>
</asp:SqlDataSource>

我的Gridview

<asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
    <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
    <Columns>
        <asp:CommandField ShowDeleteButton="True" />
        <asp:BoundField DataField="cart_quantity" HeaderText="cart_quantity" SortExpression="cart_quantity" />
        <asp:BoundField DataField="food_title" HeaderText="food_title" SortExpression="food_title" />
        <asp:BoundField DataField="food_price" HeaderText="food_price" SortExpression="food_price" />
        <asp:BoundField DataField="food_image" HeaderText="food_image" SortExpression="food_image" />
        <asp:BoundField DataField="cart_price" HeaderText="cart_price" SortExpression="cart_price" />
    </Columns>
    <EditRowStyle BackColor="#999999" />
    <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
    <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#E9E7E2" />
    <SortedAscendingHeaderStyle BackColor="#506C8C" />
    <SortedDescendingCellStyle BackColor="#FFFDF8" />
    <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>

“删除”标签。

DELETE FROM tableCustomerCart WHERE cust_id=@cust_id

Answer 1

可能未设置cust_id值，请尝试将DataKeyNames属性添加到您的网格视图中，即

<asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" DataSourceID="SqlDataSource1" DataKeyNames="cust_id" ForeColor="#333333" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">

Answer 2

如果我正确地理解您，您的字段和架构。然后，您似乎要删除购物车项目。您可能会使用这样的查询

"Delete from FROM tableCustomerCart where cart_id = @cart_id"

免责声明 ，对于您要订购的人，我不承担任何责任，否则会因该代码而受伤