数据库显示 gridview 应该是什么，gridview 没有完全填充答案

【问题标题】：Database showing what gridview should, gridview not completely filling数据库显示 gridview 应该是什么，gridview 没有完全填充
【发布时间】：2014-08-15 13:56:45
【问题描述】：

只是为了澄清一下，让我的标题有意义：我在我的数据库中测试了我的查询，它确实有效，所有数据都显示了。当我把它放在 gridview 中时，它不会填充最后一个字段。我不确定是不是因为有两个数据字段被称为“笔记”，或者我只是遗漏了一些东西，一遍又一遍地阅读它并没有帮助。

这是我的查询（我不擅长格式化）：

cmd.CommandText =

@"SELECT c.customer_id, c.customer_name, c.product_mgr, p.license_start_date, p.version, pd.processor, pd.notes, ci.f_name, ci.l_name, ci.phone, ci.email, ci.title, ci.notes FROM Customer c LEFT OUTER JOIN " + p + @" p ON c.customer_id = p.customer_id LEFT OUTER JOIN " + p + @"Details pd ON p.customer_id = pd.customer_id LEFT OUTER JOIN ContactInfo ci ON c.customer_id = ci.customer_id ORDER BY customer_id";

这是我的网格视图：

<asp:GridView id="gvProd" runat="server" EnableViewState="true" AutoGenerateColumns="false">

    <Columns>
        <asp:boundfield datafield="customer_id" headertext="Customer ID" />
        <asp:boundfield datafield="customer_name" headertext="Customer Name" />
        <asp:BoundField DataField="product_mgr" HeaderText="Product Mgr" />
        <asp:BoundField DataField="license_start_date" HeaderText="Start Date" DataFormatString="{0:d}" />
        <asp:BoundField DataField="version" headertext="Product Version" />
        <asp:BoundField DataField="processor" HeaderText="Payment Processor" /> 
        <asp:BoundField DataField="notes" HeaderText="Product Notes" />
        <asp:BoundField DataField="f_name" HeaderText="First Name" />
        <asp:BoundField DataField="l_name" HeaderText="Last Name" />
        <asp:BoundField DataField="phone" HeaderText="Phone" />
        <asp:BoundField DataField="email" HeaderText="Email" />
        <asp:BoundField DataField="title" HeaderText="Position/Title" />
        <asp:BoundField DataField="notes" HeaderText="Contact Notes" />
    </Columns>
    </asp:GridView>

该死，我认为最重要的部分我忽略了。第二个注释字段未填写。我知道里面有数据。但是其他联系人的东西已经填满了，所以我知道那是有效的

【问题讨论】：

标签： c# sql asp.net gridview

【解决方案1】：

您在查询中有两个名为 notes 的字段。为其中一个添加别名并在网格视图中使用它。

cmd.CommandText =
@"SELECT c.customer_id, c.customer_name, c.product_mgr, p.license_start_date, p.version, 
pd.processor, pd.notes AS product_notes, ci.f_name, ci.l_name, ci.phone, ci.email, 
ci.title, ci.notes AS contact_notes FROM Customer c LEFT OUTER JOIN " + p + @" p ON c.customer_id = p.customer_id
LEFT OUTER JOIN " + p + @"Details pd ON p.customer_id = pd.customer_id 
LEFT OUTER JOIN ContactInfo ci ON c.customer_id = ci.customer_id ORDER BY customer_id";



<asp:GridView id="gvProd" runat="server" EnableViewState="true" AutoGenerateColumns="false">

    <Columns>
        <asp:boundfield datafield="customer_id" headertext="Customer ID" />
        <asp:boundfield datafield="customer_name" headertext="Customer Name" />
        <asp:BoundField DataField="product_mgr" HeaderText="Product Mgr" />
        <asp:BoundField DataField="license_start_date" HeaderText="Start Date" DataFormatString="{0:d}" />
        <asp:BoundField DataField="version" headertext="Product Version" />
        <asp:BoundField DataField="processor" HeaderText="Payment Processor" /> 
        <asp:BoundField DataField="product_notes" HeaderText="Product Notes" />
        <asp:BoundField DataField="f_name" HeaderText="First Name" />
        <asp:BoundField DataField="l_name" HeaderText="Last Name" />
        <asp:BoundField DataField="phone" HeaderText="Phone" />
        <asp:BoundField DataField="email" HeaderText="Email" />
        <asp:BoundField DataField="title" HeaderText="Position/Title" />
        <asp:BoundField DataField="contact_notes" HeaderText="Contact Notes" />
    </Columns>
    </asp:GridView>

【讨论】：

我不知道这是一回事，谢谢。有空时我会标记为答案
列的名称是软件（无论是 SQL Server 还是 .NET）区分列的方式。在这种情况下，SQL Server 可能会为第二个注释列提供一些生成的名称，因此它不匹配。顺便说一句，第一个注释列是否正确显示？
如果不是以前，就是现在。该字段一开始就已经是空的（数据库仍然没有完全填充），但我添加了一些假人只是为了检查。
是的，你可能也需要一个别名。

【解决方案2】：

您是否尝试为您的笔记（在查询中）提供别名，然后将别名用作该列的数据字段值？

可能是这样的：

cmd.CommandText = @"SELECT c.customer_id, c.customer_name, c.product_mgr, p.license_start_date, p.version, 
pd.processor, pd.notes as Pd_Note, ci.f_name, ci.l_name, ci.phone, ci.email, 
ci.title, ci.notes as CI_Note FROM Customer c LEFT OUTER JOIN " + p + @" p ON c.customer_id = p.customer_id
LEFT OUTER JOIN " + p + @"Details pd ON p.customer_id = pd.customer_id 
LEFT OUTER JOIN ContactInfo ci ON c.customer_id = ci.customer_id ORDER BY customer_id";

然后：

<Columns>
    <asp:boundfield datafield="customer_id" headertext="Customer ID" />
    <asp:boundfield datafield="customer_name" headertext="Customer Name" />
    <asp:BoundField DataField="product_mgr" HeaderText="Product Mgr" />
    <asp:BoundField DataField="license_start_date" HeaderText="Start Date" DataFormatString="{0:d}" />
    <asp:BoundField DataField="version" headertext="Product Version" />
    <asp:BoundField DataField="processor" HeaderText="Payment Processor" /> 
    <asp:BoundField DataField="Pd_Note" HeaderText="Product Notes" />
    <asp:BoundField DataField="f_name" HeaderText="First Name" />
    <asp:BoundField DataField="l_name" HeaderText="Last Name" />
    <asp:BoundField DataField="phone" HeaderText="Phone" />
    <asp:BoundField DataField="email" HeaderText="Email" />
    <asp:BoundField DataField="title" HeaderText="Position/Title" />
    <asp:BoundField DataField="CI_Note" HeaderText="Contact Notes" />
</Columns>
</asp:GridView>

【讨论】：