Question

我正在尝试使用带有名为search的按钮的下拉框执行搜索查询。我希望它能够显示搜索到的数据。我不知道从哪里开始，我已经四处寻找一些编码和不同的方法，但它们看起来很复杂，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

这取决于您的策略，如果您想使用完全相同的匹配进行搜索，则您的搜索查询将如下所示： SELECT * FROM [Products] WHERE [ProductId]=@ProductID AND [Price]=@Price AND ......以及您需要的其他条件。

如果你想要检索类似的结果，你必须像这样使用LIKE而不是'='： SELECT * FROM [Products] WHERE [ProductId] LIKE '%' + @ProductId+ '%' AND ([Price] BETWEEN @Price1 AND @Price2) AND ......以及其他条件

Price1和Price2可以是用户输入价格的范围

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

在VB.net中搜索查询需要帮助吗？

1 个答案: