需要VB.net帮助搜索查询？

Question

我正在尝试使用名为search的按钮使用下拉框执行搜索查询。我想让它调出搜索的数据。我不知道从哪里开始，我已经寻找了一些编码和不同的方式来做到这一点，但他们似乎很复杂，这是ASP的一点，这是我的弱点，需要一些帮助和指导。下面是该页面的代码;

<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="ForSale.aspx.vb" Inherits="Users_ForSale" title="Properties For Sale" %> 

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> 
    </asp:Content> 
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> 


    <h3>Properties For Sale</h3> 
    <h5> 
     <asp:Label ID="lblTown" runat="server" Text="Town:"></asp:Label> 
     <asp:DropDownList ID="ddlTownSearch" runat="server"> 
      <asp:ListItem></asp:ListItem> 
      <asp:ListItem>Chadderton</asp:ListItem> 
      <asp:ListItem Value="Failsworth"></asp:ListItem> 
      <asp:ListItem>Oldham</asp:ListItem> 
      <asp:ListItem>Royton</asp:ListItem> 
      <asp:ListItem>Shaw</asp:ListItem> 
     </asp:DropDownList> 
     <asp:Label ID="lblBedroomsSearch" runat="server" Text="Bedrooms:"></asp:Label> 
     <asp:DropDownList ID="DropDownList1" runat="server"> 
      <asp:ListItem></asp:ListItem> 
      <asp:ListItem>1</asp:ListItem> 
      <asp:ListItem Value="2"></asp:ListItem> 
      <asp:ListItem Value="3"></asp:ListItem> 
      <asp:ListItem>4</asp:ListItem> 
      <asp:ListItem>5</asp:ListItem> 
      <asp:ListItem>6+</asp:ListItem> 
     </asp:DropDownList> 
     <asp:Label ID="lblMinPrice" runat="server" Text="Min Price (£):"></asp:Label> 
     <asp:TextBox ID="txtMinPriceSearch" runat="server" Width="87px"></asp:TextBox> 
     <asp:Label ID="lblMaxPriceSearch" runat="server" style="text-align: left" 
      Text="Max Price (£):"></asp:Label> 
     <asp:TextBox ID="TextBox1" runat="server" Width="87px"></asp:TextBox> 
    </h5> 
    <h5> 
     <asp:Button ID="btnForsaleSearch" runat="server" Text="Search" /> 
    </h5> 
    <p> 
     <asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
      AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" 
      DataKeyNames="ProductId" DataSourceID="SqlDataSource1" ForeColor="#333333" 
      GridLines="None" Width="588px"> 
      <RowStyle BackColor="#FFFBD6" ForeColor="#333333" /> 
      <Columns> 
       <asp:ImageField DataImageUrlField="ImageURL"> 
       </asp:ImageField> 
       <asp:BoundField DataField="ProductId" HeaderText="ProductId" ReadOnly="True" 
        SortExpression="ProductId" /> 
       <asp:BoundField DataField="Description" HeaderText="Description" 
        SortExpression="Description" /> 
       <asp:BoundField DataField="Price" HeaderText="Price" SortExpression="Price" /> 
       <asp:BoundField DataField="Town" HeaderText="Town" 
        SortExpression="Town" /> 
      </Columns> 
      <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" /> 
      <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" /> 
      <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" /> 
      <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" /> 
      <AlternatingRowStyle BackColor="White" /> 
     </asp:GridView> 
    </p> 
     <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
    ConnectionString="<%$ ConnectionStrings:JPEstatesConnectionString %>" 
    SelectCommand="SELECT * FROM [Products]" 
     DeleteCommand="DELETE FROM [Products] WHERE [ProductId] = @ProductId" 
     InsertCommand="INSERT INTO [Products] ([ProductId], [Description], [Price], [Category], [ImageURL]) VALUES (@ProductId, @Description, @Price, @Category, @ImageURL)" 
     UpdateCommand="UPDATE [Products] SET [Description] = @Description, [Price] = @Price, [Category] = @Category, [ImageURL] = @ImageURL WHERE [ProductId] = @ProductId"> 
      <DeleteParameters> 
       <asp:Parameter Name="ProductId" Type="String" /> 
      </DeleteParameters> 
      <UpdateParameters> 
       <asp:Parameter Name="Description" Type="String" /> 
       <asp:Parameter Name="Price" Type="Decimal" /> 
       <asp:Parameter Name="Category" Type="String" /> 
       <asp:Parameter Name="ImageURL" Type="String" /> 
       <asp:Parameter Name="ProductId" Type="String" /> 
      </UpdateParameters> 
      <InsertParameters> 
       <asp:Parameter Name="ProductId" Type="String" /> 
       <asp:Parameter Name="Description" Type="String" /> 
       <asp:Parameter Name="Price" Type="Decimal" /> 
       <asp:Parameter Name="Category" Type="String" /> 
       <asp:Parameter Name="ImageURL" Type="String" /> 
      </InsertParameters> 
    </asp:SqlDataSource> 

</asp:Content> 

Answer 1

这取决于你的战略，如果你想用完全一样的匹配搜索查询来搜索将是这样的： SELECT * FROM [Products] WHERE [ProductId]=@ProductID AND [Price]=@Price AND ...那你需要的其他条件。

，如果你想取回了类似的结果，你要喜欢，而不是使用“=”像这样的： SELECT * FROM [Products] WHERE [ProductId] LIKE '%' + @ProductId+ '%' AND ([Price] BETWEEN @Price1 AND @Price2) AND ...等条件

价格1和Price2可以是用户输入的价格范围

它可以帮助您使用ASP.NET SQLParameters with LIKE statement