Question

我的转发器正在SQL Server数据库中搜索日期并返回每个月的前3个字母。有没有办法以我想要的方式显示转发器？

<asp:repeater id="rptLetters" runat="server" datasourceid="dsLetters">
<headertemplate>
|
</headertemplate>
<itemtemplate>
<asp:linkbutton id="btnLetter" runat="server" onclick="btnLetter_Click" text='<%#Eval("Letter")%>' />
</itemtemplate>

<separatortemplate>
|
</separatortemplate>
</asp:repeater>

 <asp:DropDownList ID="ddlLetters" runat="server" Visible="False"  DataSourceID="dsLetters">
</asp:DropDownList>

<asp:sqldatasource id="dsLetters" runat="server" connectionstring="<%$  
 ConnectionStrings:ProductsConnectionString %>"  
   selectcommand="SELECT DISTINCT LEFT       
   (p.LaunchDate, 3) AS [Letter] 
   FROM Product p, Category c 
   WHERE c.ParentID = 37 
   AND p.LaunchDate IS NOT NULL">
</asp:sqldatasource>

显示为：ALL |四月|八月| 12月|二月| Jan |七月|君| Mar |五月| 11月|十月|月

想：ALL | Jan |二月| Mar |四月|五月|君|七月|八月|九月|十月| 11月|癸

Answer 1

尽管上面提出了反对意见，但这演示了如何在提取不同内容之前处理对依赖项进行排序的需求：

select distinct left(launchdate,3) as Abbreviated from
(   select * from product 
    where launchdate is not null order by month(launchdate) asc) p,     
category c where c.parentid=@ParentId

对于这种特殊情况，您不应该使用查询来提取月份缩写，假设默认的日期到字符串转换将使您的左侧3个字符成为准确的月份缩写。

Answer 2

我放弃了转发器的想法，我只是使用链接按钮来列出月份。然后，我的SQL查询将根据点击的月份查找结果。

<asp:linkbutton id="btnAll" runat="server" text="ALL" onclick="btnAll_Click" /> |
<asp:linkbutton id="btnJan" runat="server" text="Jan" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnFeb" runat="server" text="Feb" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnMar" runat="server" text="Mar" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnApr" runat="server" text="Apr" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnMay" runat="server" text="May" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnJune" runat="server" text="June" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnJuly" runat="server" text="July" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnAug" runat="server" text="Aug" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnSep" runat="server" text="Sep" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnOct" runat="server" text="Oct" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnNov" runat="server" text="Nov" onclick="btnMonths_Click" /> |
<asp:linkbutton id="btnDec" runat="server" text="Dec" onclick="btnMonths_Click" />



SELECT p.ProductID, p.ProductName, p.LaunchDate 
FROM Product p JOIN CategoryLink l 
ON p.ProductID = l.ProductID 
JOIN Category c ON c.CategoryID = l.CategoryID 
WHERE(p.LaunchDate LIKE '{0}%') 
AND c.ParentID = '37' 
AND p.ProductName IS NOT NULL 
ORDER BY Month(p.LaunchDate), Day(p.LaunchDate)

VB.NET转发器按月分组

2 个答案: