Question

我正在尝试开发一个ASP.NET页面，它将显示我的数据库中的条目。我的查询中大约有16列。但是，如果我在我的代码中放入包含所有16列的查询，则GridView不会显示。

仅当我的查询中的列数不超过8列时，它才会显示在页面上。我不知道该怎么办可以帮助我吗？

这些是查询的代码示例和用于填充查询的bask结尾

 <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" 
        GridLines="None" Width="900px">
        <AlternatingRowStyle BackColor="White" />
        <EditRowStyle BackColor="#2461BF" />
        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#EFF3FB" />
        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
        <SortedAscendingCellStyle BackColor="#F5F7FB" />
        <SortedAscendingHeaderStyle BackColor="#6D95E1" />
        <SortedDescendingCellStyle BackColor="#E9EBEF" />
        <SortedDescendingHeaderStyle BackColor="#4870BE" />
    </asp:GridView>

这就是我填充它的方式：

Try
        myconn.Open()
        Dim sqlstring As String = "SELECT a.account_id AS 'No', a.accountid_number AS 'ID', CONCAT(account_name,' ',account_midname,' ',account_surname ) AS 'Student Name', a.account_type As 'Type', l.live_mail AS 'Acount Name' AS 'Password' FROM account a, liveaccount l WHERE a.account_id = l.l_account_id"
        Dim smd As MySqlCommand
        smd = New MySqlCommand(sqlstring, myconn)
        smd.CommandType = CommandType.Text

        Dim da As New MySqlDataAdapter(smd)
        Dim cb As New MySqlCommandBuilder(da)
        Dim ds As New DataSet()
        da.Fill(ds)

        GridView1.DataSource = ds.Tables(0)
        GridView1.DataBind()

        myconn.Close()
    Catch ex As Exception
        myconn.Close()
    End Try

这是有效的查询。如果我再添加一列，则不会显示：

SELECT a.account_id AS 'No', a.accountid_number AS 'ID', CONCAT(account_name,' ',account_midname,' ',account_surname ) AS 'Student Name', a.account_type As 'Type', l.live_mail AS 'Acount Name' FROM account a, liveaccount l WHERE a.account_id = l.l_account_id"

这个假设可以工作，但如果我插入它，则gridView不显示：

SELECT a.account_id AS 'No', a.accountid_number AS 'ID', a.account_type AS 'Type', a.account_name || ' ' || a.account_midname || ' ' || a.account_surname  AS 'Student Name', a.account_birthdate AS 'BirthDate', l.gender AS 'Gender', l.position AS 'Position', l.office_department AS 'Office/Department', l.date_created AS 'Date Created', time_created AS 'Time Created', l.office_tel AS 'Tel No', office_localno AS 'Office Tel', l.contact_no 'Cell Phone', l.alternate_email AS 'Other Email', l.classification AS 'Classification', l.registered AS 'Status' FROM account a, liveaccount l WHERE a.account_id = l.l_account_id AND l.registered = 'NOTREGISTERED' AND a.account_deleted = 0 ORDER BY a.account_id Desc;

Answer 1

运行查询后，您是否验证过DataSet有任何数据？您可以尝试将SQL粘贴到管理工作室或查询分析器中，看看是否存在SQL代码问题。

此外，您正在使用try / catch，但没有捕获任何特定异常。我会改变它。这是C＃，你应该能够轻松地翻译成VB。

catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex.ToString());}

这将显示加载数据时发生的情况以及数据绑定的任何错误。

所有数据都不适合数据网格视图

1 个答案: