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Gridview SqlDataSource toggle between Ascending and Descding order using a control param

Posted on 2009-07-06
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Last Modified: 2013-11-07
Am using a simple radiobutton to let the user toggle between ascending and descending order on a gridview. Already have a CASE WHEN THEN statement to let the user toggle between the sort key but the same approach does not seem to work on ASC or DESC.

See code for a clearer explanation. NB : code does not work
<asp:SqlDataSource ID="SqlDataSource_ContactHyperlink" runat="server" ConnectionString="<%$ ConnectionStrings:conn_db1 %>"
                                            ProviderName="System.Data.SqlClient" 
                                           SelectCommand="SELECT IndexID, OrderID, hyperlink_url, DomainName, 
                                            hyperlink_memo, origin_UserName, origin_UserID, origin_Visibility, origin_dateTime, starRating 
                                            FROM tbl_bookmarks 
                                            WHERE (origin_UserID = @curUserID) 
                                            ORDER BY CASE @SortBy 
                                            WHEN 'IndexID' THEN cast(IndexID AS varchar(256))
                                            WHEN 'starRating' THEN cast(starRating AS varchar(256))
                                            WHEN 'domain' THEN DomainName
                                            END
                                            CASE @SortOrder
                                            WHEN 'ascending' THEN ASC
                                            WHEN 'descending' THEN DESC
                                            END">
                                            <SelectParameters>
                                                <asp:SessionParameter Name="curUserID" SessionField="UserGUID" Type="String" />
                                                <asp:ControlParameter ControlID="DropDownList_sortOrder" Name="SortBy" PropertyName="SelectedValue" Type="String" />
                                                 <asp:ControlParameter ControlID="RadioButtonList_sortType" Name="SortOrder" PropertyName="SelectedValue" Type="String" />
                                            </SelectParameters>
                                        </asp:SqlDataSource>

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Question by:JOHNFROG
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5 Comments
 
LVL 57

Expert Comment

by:Raja Jegan R
ID: 24784744
You cannot achieve this is in a T-SQL statement and you need to use Dynamic SQL like below:

Hope this helps
Declare @sql nvarchar(1000);
set @sql = 'SELECT IndexID, OrderID, hyperlink_url, DomainName, 
hyperlink_memo, origin_UserName, origin_UserID, origin_Visibility, origin_dateTime, starRating 
FROM tbl_bookmarks 
WHERE (origin_UserID = ' + @curUserID + ') 
ORDER BY CASE @SortBy 
WHEN 'IndexID' THEN cast(IndexID AS varchar(256))
WHEN 'starRating' THEN cast(starRating AS varchar(256))
WHEN 'domain' THEN DomainName
END ' + (SELECT CASE @SortOrder WHEN 'ascending' THEN 'ASC' WHEN 'descending' THEN 'DESC' END);
EXEC sp_executesql @sql;

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Author Comment

by:JOHNFROG
ID: 24784834
think I am losing something in my implementation as am getting an error

"Incorrect syntax near 'IndexID'

See code snippet my interpretation of what you have suggested
  <asp:SqlDataSource ID="SqlDataSource_ContactHyperlink" runat="server" ConnectionString="<%$ ConnectionStrings:conn_trymoreharder %>"
                                            ProviderName="System.Data.SqlClient" 
                                           SelectCommand="Declare @sql nvarchar(1000);
                                            set @sql = 'SELECT IndexID, OrderID, hyperlink_url, DomainName, 
                                            hyperlink_memo, origin_UserName, origin_UserID, origin_Visibility, origin_dateTime, starRating 
                                            FROM tbl_bookmarks 
                                            WHERE (origin_UserID = ' + @curUserID + ') 
                                            ORDER BY CASE @SortBy 
                                            WHEN 'IndexID' THEN cast(IndexID AS varchar(256))
                                            WHEN 'starRating' THEN cast(starRating AS varchar(256))
                                            WHEN 'domain' THEN DomainName
                                            END ' + (SELECT CASE @SortOrder WHEN 'ascending' THEN 'ASC' WHEN 'descending' THEN 'DESC' END);
                                            EXEC sp_executesql @sql;">
 
                                            <SelectParameters>
                                                <asp:SessionParameter Name="curUserID" SessionField="UserGUID" Type="String" />
                                                <asp:ControlParameter ControlID="DropDownList_sortOrder" Name="SortBy" PropertyName="SelectedValue" Type="String" />
                                                <asp:ControlParameter ControlID="RadioButtonList_sortType" Name="SortOrder" PropertyName="SelectedValue" Type="String" />
                                            </SelectParameters>
                                        </asp:SqlDataSource>

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Accepted Solution

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Raja Jegan R earned 2000 total points
ID: 24785056
Script which I gave you will work fine.
Just take care of single and double quotes to correct it out.
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Author Closing Comment

by:JOHNFROG
ID: 31600131
genius
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LVL 57

Expert Comment

by:Raja Jegan R
ID: 24785132
Thanks..
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