如何在1个DataSource上添加多个SQL语句/查询字符串？

Question

I currently have the following statement with QueryString set to ProductCategory on my ListView control:

SELECT * FROM Products WHERE (ProductCategory = ?)

I would like to add this statement and query string on the same DataSource to allow query string for ProductModel as well, how can I do that?

SELECT * FROM Products WHERE (ProductModel = ?)

ListVIew

  <asp:ListView runat="server" ID="listView" GroupItemCount="3" 
        DataSourceID="AccessDataSource1">
    <LayoutTemplate>
        <div style="height: 966px;">
        <div style="width: 771px;">
            <asp:PlaceHolder runat="server" ID="groupPlaceHolder" />
        <asp:DataPager runat="server" ID="dpMyDatePager" PageSize="9"
 PagedControlID="listView">
<Fields>
    <asp:NextPreviousPagerField ButtonType="Button" ShowLastPageButton="True"
     ShowFirstPageButton="True" />
     <asp:NumericPagerField />
</Fields>
</asp:DataPager>
        </div>
    </LayoutTemplate>
    <GroupTemplate>
        <div style="clear: both;">
            <asp:PlaceHolder runat="server" ID="itemPlaceHolder" />
        </div>
    </GroupTemplate>
    <ItemTemplate>
<div class="productItem">
    <div>
        <img src='<%# Eval("ProductUrl") %>' >
    </div>
    <div class="catalog-price">
    <br />    
            <%# Eval("ProductBrand") %>
            <%# Eval("ProductModel") %></div>

    <div class="catalog-price2">
        <b>
        Our Price: S$<%# Eval("NormalPrice") %></div>
        </b><br />
    <div class="cell1">
        Add to cart</div>
    <div class="cell2">
    <asp:HyperLink ID="HypViewDetails" style="text-decoration:none"      NavigateUrl='<%#Eval("ProductId", "ProductDetails.aspx?ProductID={0}")%>'
 runat="server">View Details</asp:HyperLink>
        </div>
</div>
</ItemTemplate>
    <ItemSeparatorTemplate>
        <div class="itemSeparator">
        </div>
    </ItemSeparatorTemplate>
    <GroupSeparatorTemplate>
        <div class="groupSeparator">
        </div>
    </GroupSeparatorTemplate>
    <EmptyDataTemplate>
    </EmptyDataTemplate>
</asp:ListView>
    <asp:AccessDataSource ID="AccessDataSource1" runat="server" 
        DataFile="~/App_Data/TabStoreDB.mdb" 

            SelectCommand="SELECT * FROM Products WHERE (ProductCategory = ?) OR    (ProductBrand = ?)">
        <SelectParameters>
            <asp:QueryStringParameter Name="?" QueryStringField="ProductCategory" />
            <asp:QueryStringParameter Name="?" QueryStringField="ProductBrand" />
        </SelectParameters>
    </asp:AccessDataSource>

Answer 1

Unless I am totally not understanding your problem. You can just add AND/OR to you WHERE clause

OR WHERE clause

SELECT * 
FROM Products 
WHERE (ProductCategory = ?)
OR (ProductModel = ?)

AND WHERE Clause

SELECT * 
FROM Products 
WHERE (ProductCategory = ?)
AND (ProductModel = ?)

Based on your edit you have both query parameters are ? - they each need to have a specific name

SelectCommand="SELECT * FROM Products WHERE (ProductCategory = @ProductCategory) OR    (ProductBrand = @ProductBrand)">
        <SelectParameters>
            <asp:QueryStringParameter Name="ProductCategory" QueryStringField="ProductCategory" />
            <asp:QueryStringParameter Name="ProductBrand" QueryStringField="ProductBrand" />
        </SelectParameters>

If you are unsure of how to use the parameters, I suggest the following reading:

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.sqldatasource.selectparameters.aspx

http://msdn.microsoft.com/en-us/library/xt50s8kz.aspx

Answer 2

You gave both parameters the same name. You need to be specfic -- try this:

SelectCommand="SELECT * FROM Products WHERE (ProductCategory = @cat) OR    (ProductBrand = @brand)">

And then this:

<SelectParameters>
            <asp:QueryStringParameter Name="cat" QueryStringField="ProductCategory" />
            <asp:QueryStringParameter Name="brand" QueryStringField="ProductBrand" />
        </SelectParameters>