Question

我利用向导创建了“插入编辑更新”和“删除”语句。问题是它们在我的网格视图中不起作用。当我去使用它时，我收到一个错误：

没有给出一个或多个必需参数的值。

我想知道可能是什么问题？它可以查询和显示数据。

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    <asp:LoginStatus ID="LoginStatus1" runat="server" />
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<p>&nbsp;Current Posts:
    <asp:GridView ID="GridView1" runat="server" DataSourceID="AccessDataSource1" 
        AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" 
        BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" 
        CellPadding="3" CellSpacing="2" DataKeyNames="Title">
        <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
        <Columns>
            <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" 
                ReadOnly="True" />
            <asp:BoundField DataField="User" HeaderText="User" SortExpression="User" />
            <asp:BoundField DataField="Timeof" HeaderText="Date" 
                SortExpression="Timeof" />
            <asp:BoundField DataField="Post" HeaderText="Post" SortExpression="Post" />
            <asp:CommandField ButtonType="Button" ShowEditButton="True" />
            <asp:CommandField ButtonType="Button" ShowDeleteButton="True" />
        </Columns>
        <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
        <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
    </asp:GridView>

    <asp:AccessDataSource ID="AccessDataSource1" runat="server" 
        DataFile="~/App_Data/Posts.mdb" 
        SelectCommand="SELECT * FROM [UserPost] ORDER BY [Timeof]" 
        DeleteCommand="DELETE FROM [UserPost] WHERE (([Title] = ?) OR ([Title] IS NULL AND ? IS NULL))" 
        InsertCommand="INSERT INTO [UserPost] ([Title], [User], [Timeof], [Post]) VALUES (?, ?, ?, ?)" 
        UpdateCommand="UPDATE [UserPost] SET [User] = ?, [Timeof] = ?, [Post] = ? WHERE (([Title] = ?) OR ([Title] IS NULL AND ? IS NULL))">
        <DeleteParameters>
            <asp:Parameter Name="Title" Type="String" />
        </DeleteParameters>
        <UpdateParameters>
            <asp:Parameter Name="User" Type="String" />
            <asp:Parameter Name="Timeof" Type="DateTime" />
            <asp:Parameter Name="Post" Type="String" />
            <asp:Parameter Name="Title" Type="String" />
        </UpdateParameters>
        <InsertParameters>
            <asp:Parameter Name="Title" Type="String" />
            <asp:Parameter Name="User" Type="String" />
            <asp:Parameter Name="Timeof" Type="DateTime" />
            <asp:Parameter Name="Post" Type="String" />
        </InsertParameters>
    </asp:AccessDataSource>

</p>

    <table>
    <tr><td> <asp:Label ID="Label1" runat="server" Text="User: "></asp:Label></td><td> 
        <asp:TextBox ID="TextBox1" runat="server" ValidationGroup="createpost"></asp:TextBox></td></tr>
    <tr><td><asp:Label ID="Label2" runat="server" Text="Title: "></asp:Label></td><td><asp:TextBox ID="TextBox2"
            runat="server" ValidationGroup="createpost"></asp:TextBox></td></tr>
    <tr><td><asp:Label ID="Label3" runat="server" Text="Date: "></asp:Label></td><td> <asp:TextBox ID="TextBox3"
            runat="server"></asp:TextBox></td></tr>
    <tr><td valign="top"><asp:Label ID="Label4" runat="server" Text="Story: "></asp:Label></td><td valign="top">
        <asp:TextBox ID="TextBox4" runat="server" Height="129px" Width="474px" 
            TextMode="MultiLine"></asp:TextBox></td></tr>
    </table>
        <asp:Button ID="makepost" runat="server" Text="Post My Tip/Story" 
            ValidationGroup="createpost" onclick="makepost_Click" /><br />

</div>

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Answer 1

我现在对访问权限不是很好，但正如我在DeleteCommand中看到（并经过测试）你指定2个参数但只声明1，这与命名参数的SQL Server不同，你可以使用一个参数在查询中有很多时间，在UpdateCommand中发生相同但有更多参数...请参见Where语句。

尝试做这样的事情：

DeleteCommand="DELETE FROM UserPost WHERE (Title = ?)" 
UpdateCommand="UPDATE UserPost SET [User] = ?, Timeof = ?, Post = ? WHERE (Title = ?)"

我测试过它。

编辑：您的表中大多数都有一个ID（唯一主键）可以使用它而不是标题字段。

ASP.NET删除/插入/更新问题但显示有效吗？使用向导

1 个答案: