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Help with a where statement

Posted on 2009-07-06
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Last Modified: 2012-05-07
I am creating an ASP Application and have the following SQL Statement:

select assetname, serialnumber,parentserialnumber,(case when parentserialnumber = '' then 'False' else 'True' end) as assigned
from assets
where parentserialnumber like @asset

So what I have is a drop down box that allows the user to select:

Both
Assigned
Un-Assigned

The problem I am having is how to structure my SQL so that I can take advantage of the 3 possible states. Both would simply be a '%' while Un-Assigned would be ''

But how would I go about getting the Assigned Values, as I am not sure  how I could tweak my SQL statement to allow this.

Cheers
<asp:DropDownList ID="ddlAssigned" runat="server" AppendDataBoundItems="True" 

                            AutoPostBack="true" Width="150px">

                            <asp:ListItem Value="-1">All</asp:ListItem>

                            <asp:ListItem Value="1">Assigned</asp:ListItem>

                            <asp:ListItem Value="2">Un-Assigned</asp:ListItem>

                        </asp:DropDownList>
 
 

//in the code behind   
 
 
 

 Protected Sub SqlDataSource1_Selecting(ByVal sender As Object, ByVal e As SqlDataSourceSelectingEventArgs)
 

       If ddlAssigned.SelectedValue.Equals("1") Then

            e.Command.Parameters("@assigned").Value = ""

        ElseIf ddlAssigned.SelectedValue.Equals("2") Then

            e.Command.Parameters("@assigned").Value = ""

        End If

    End Sub

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Question by:directxBOB
3 Comments
 
LVL 9

Expert Comment

by:Rahul Goel
ID: 24783593
Your question is so confusing. Can you please give me some live example or make it so clear to me?
Thank you
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Author Comment

by:directxBOB
ID: 24783701
I have this SQL Statement

select assetname, serialnumber,parentserialnumber,(case when parentserialnumber = '' then 'False' else 'True' end) as assigned
from assets
where parentserialnumber like @asset

the @asset is an SQLDatasource Parameter, where I am going to inject data into the statement to get the desired results.

I am looking to adapt the SQL statement so that I can get the desired results depending on the state I am selecting:

Both
Assigned
Un-Assigned

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LVL 2

Accepted Solution

by:
diazluna earned 500 total points
ID: 24816958
The trick is in the Values you are passing plus your like statement.

if dropdown = "Both" then

    Param1 = "Assigned"

    Param2 = "Un-Assigned"

else

    Param1 = dropdown.value

    Param2 = ""

end if
 

//And then your query:

select assetname, serialnumber,parentserialnumber,(case when parentserialnumber = '' then 'False' else 'True' end) as assigned

from assets

where parentserialnumber = @asset1

   or parentserialnumber = @asset2
 

//Finally assigne @asset1 and @asset2 your values from parameter1 and parameter2.

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