Solved

Howto use multiple QueryStringParameters in a SelectCommand for a MySQL SqlDataSource

Posted on 2008-10-29
2
1,004 Views
Last Modified: 2012-05-05
I am trying to use multiple QueryStringParameters in a SelectCommand for a MySQL SqlDataSource. I can use 1 just fine like this:

[CODE]
<asp:SqlDataSource ID="db_faa" runat="server"
                ConnectionString="Dsn=my_faa;uid=root;pwd=root"
                ProviderName="System.Data.Odbc"
                SelectCommand="SELECT faa_part, faa_part_desc, faa_status FROM tbl_faa_tracking WHERE faa_pl_desc = ?">
                <SelectParameters>
                       <asp:QueryStringParameter Name="value" QueryStringField="value" />
                </SelectParameters>
            </asp:SqlDataSource>
[/CODE]

and a query string like this:  ?value=TE456

But I actually need to pass in the field name as well like this:  ?field=faa_pl_desc&value=TE456
so I tried changing the code to this:

[CODE]
<asp:SqlDataSource ID="db_faa" runat="server"
                ConnectionString="Dsn=my_faa;uid=root;pwd=root"
                ProviderName="System.Data.Odbc"
                SelectCommand="SELECT faa_part, faa_part_desc, faa_status FROM tbl_faa_tracking WHERE ? = ?">
                <SelectParameters>
                    <asp:QueryStringParameter Name="field" QueryStringField="field" />
                    <asp:QueryStringParameter Name="value" QueryStringField="value" />
                </SelectParameters>
            </asp:SqlDataSource>
[/CODE]

I get no error, I just get a blank data set. It is as if the Select is returning no data even tho it has the same field name and search value in both instances. I have tired reversing the order of the 2 QueryStringParameters just in case the parameters are in a stack instead of a FIFO. No joy...

I think I just must be passing the 2 Query strings with some syntax missing?

Dave
0
Comment
Question by:davecove
2 Comments
 
LVL 32

Assisted Solution

by:Daniel Wilson
Daniel Wilson earned 100 total points
ID: 22831528
You can't use a parameter value as a field name.  What you have is translating as:

SELECT faa_part, faa_part_desc, faa_status FROM tbl_faa_tracking WHERE 'faa_pl' = 'TE465'

And that is going to return no records.

The number of valid fields is going to be finite, so coding for each branch is reasonable:

SELECT faa_part, faa_part_desc, faa_status FROM tbl_faa_tracking
WHERE
 (@Field = 'faa_pl' and faa_pl = @Value)
OR   (@Field = 'Field2' and Field2 = @Value)
OR   (@Field = 'Field3' and Field3 = @Value)
0
 

Accepted Solution

by:
davecove earned 0 total points
ID: 22831809
Or something like that...
When you use MySQL you don't get to use things like @Field and @Value... you can only use a ? and then put the QueryStringParameters in the order you want to use them in the Select.
So your suggestion turns into:
SELECT faa_part, faa_part_desc, faa_status FROM tbl_faa_tracking
WHERE
(? = 'faa_pl' and faa_pl = ?)
OR   (? = 'Field2' and Field2 = ?)
OR   (? = 'Field3' and Field3 = ?)
followed by 6 QueryStringParameters to take care of the 6 question marks. Like so:
<asp:QueryStringParameter Name="field" QueryStringField="field" />
<asp:QueryStringParameter Name="value" QueryStringField="value" />
<asp:QueryStringParameter Name="field" QueryStringField="field" />
<asp:QueryStringParameter Name="value" QueryStringField="value" />
<asp:QueryStringParameter Name="field" QueryStringField="field" />
<asp:QueryStringParameter Name="value" QueryStringField="value" />  
Which is just fine with me... because it works!
Dave
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
In a recent question (https://www.experts-exchange.com/questions/28997919/Pagination-in-Adobe-Acrobat.html) here at Experts Exchange, a member asked how to add page numbers to a PDF file using Adobe Acrobat XI Pro. This short video Micro Tutorial sh…

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question