Question

第3个SelectParameter在SQL语句中无法识别的问题：[UsersDataTbl.UID] NOT IN (SELECT UID FROM [EnrollmentsTbl] WHERE ClassName = ?) AND Completed = True我也使用了@ClassName并得到了同样的错误：＆＃34;没有给出一个或多个必需参数的值。＆＃34;

如果我更换？使用＆＃39;实际的班级名称＆＃39;，结果符合要求。

   <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
    DataSourceID="AccessDataSource2" DataTextField="ClassName" DataValueField="ClassName">
</asp:DropDownList>&nbsp;

<asp:DropDownList ID="DropDownList3" runat="server" 
    DataSourceID="AccessDataSource4" DataTextField="Battallion" 
    DataValueField="Battallion" AutoPostBack="True">
</asp:DropDownList>&nbsp;

<asp:DropDownList ID="DropDownList4" runat="server" 
    DataSourceID="AccessDataSource5" DataTextField="Shift" 
    DataValueField="Shift" AutoPostBack="True">
</asp:DropDownList>&nbsp;

<asp:AccessDataSource ID="AccessDataSource1" runat="server" 
DataFile="<%$ ConnectionStrings:AccessSubSiteString %>"
    SelectCommand="SELECT [UsersDataTbl.StudentID], [UsersDataTbl.UserName], 
    [UsersDataTbl.LastName], [UsersDataTbl.FirstName], [UsersDataTbl.Affiliation], [UsersDataCareerTbl.Battallion], [UsersDataCareerTbl.Shift], [UsersDataTbl.UID], [ALSProviders.ALS] 
    FROM ([UsersDataTbl] INNER JOIN [UsersDataCareerTbl] ON (UsersDataTbl.UID = UsersDataCareerTbl.UID)) LEFT JOIN [ALSProviders] ON (UsersDataTbl.UID = ALSProviders.UID)
    WHERE [UsersDataTbl.Career] = True AND [UsersDataTbl.Active] = True AND (UsersDataCareerTbl.Battallion = ?) AND (UsersDataCareerTbl.Shift = ?) 
    AND ([UsersDataTbl.UID] NOT IN (SELECT UID FROM [EnrollmentsTbl] WHERE ClassName = ?) AND Completed = True)
    ORDER BY [UsersDataTbl.LastName]">
    <SelectParameters>
        <asp:ControlParameter ControlID="DropDownList3" Name="Battallion" PropertyName="SelectedValue" Type="String" />
        <asp:ControlParameter ControlID="DropDownList4" Name="Shift" PropertyName="SelectedValue" Type="String" /> 
        <asp:ControlParameter ControlID="DropDownList1" Name="ClassName" PropertyName="SelectedValue" Type="String" />           
    </SelectParameters>
</asp:AccessDataSource>

Answer 1

感谢@Rafael的指导，添加额外的JOIN似乎解决了这个问题。仍然需要IS NULL。这是决议：

<asp:AccessDataSource ID="AccessDataSource1" runat="server" 
DataFile="<%$ ConnectionStrings:AccessSubSiteString %>"
    SelectCommand="SELECT [UsersDataTbl.StudentID], [UsersDataTbl.UserName], [UsersDataTbl.LastName], [UsersDataTbl.FirstName], [UsersDataTbl.Affiliation], [UsersDataCareerTbl.Battallion], [UsersDataCareerTbl.Shift], [UsersDataTbl.UID], [ALSProviders.ALS] 
    FROM (([UsersDataTbl] INNER JOIN [UsersDataCareerTbl] ON (UsersDataTbl.UID = UsersDataCareerTbl.UID)) 
    LEFT JOIN [ALSProviders] ON (UsersDataTbl.UID = ALSProviders.UID)) 
    LEFT JOIN [EnrollmentsTbl] ON (UsersDataTbl.UID = EnrollmentsTbl.UID AND ClassName = ?) 
    WHERE [UsersDataCareerTbl.Battallion] = ?  
    AND [UsersDataCareerTbl.Shift] = ?  
    AND [EnrollmentsTbl.UID] IS NULL 
    ORDER BY [UsersDataTbl.LastName]">
    <SelectParameters>
        <asp:ControlParameter ControlID="DropDownList3" Name="Battallion" PropertyName="SelectedValue" Type="String" />
        <asp:ControlParameter ControlID="DropDownList4" Name="Shift" PropertyName="SelectedValue" Type="String" /> 
        <asp:ControlParameter ControlID="DropDownList1" Name="ClassName" PropertyName="SelectedValue" Type="String" />           
    </SelectParameters>
</asp:AccessDataSource>

SelectParameter使用失败？要么 @

1 个答案: