Solved

How to select items from listbox and use sqlcommand

Posted on 2010-11-29
4
415 Views
Last Modified: 2012-08-13
Hi,

I want to select * from table where xxx = listbox.items

I have tried this:
SelectCommand="SELECT * FROM [XXX] WHERE [XXX] IN (@listbox)">
                 
                 <SelectParameters>  
                    <asp:ControlParameter ControlID="listbox" Name="listbox" Type="String" />                  
                                       
                 </SelectParameters>

Open in new window

0
Comment
Question by:mattegol
4 Comments
 
LVL 51

Expert Comment

by:HainKurt
ID: 34230061
remove the select parameter and and write a code for listbox_change event and get all selected values put into a string like

if it is a number : "1, 2, 3"
if it is string : "'Hain', 'Kurt', 'EE'"

then change the select command like:

SelectCommand="SELECT * FROM [XXX] WHERE [XXX] IN (" & selected_values & ")"

then reQuery/re-bind/refresh the control to get the new values from db...
0
 
LVL 5

Expert Comment

by:logideepak
ID: 34230119
you would need to create a procedure and a function and pass the comma seperated values to the procedure which would ultimately return a table object and then you can

select * from table where xxx in (Select ufn_CommaseperatedToTable(comma sepearated values)


Let me know if you want another code snippet for the procedure as well to see how the whole thing would work,.
create FUNCTION [dbo].[ufn_CommaseperatedToTable] ( @StringInput VARCHAR(8000) )
RETURNS @OutputTable TABLE ( [String] VARCHAR(10) )
AS
BEGIN

    DECLARE @String    VARCHAR(10)

    WHILE LEN(@StringInput) > 0
    BEGIN
        SET @String      = LEFT(@StringInput, 
                                ISNULL(NULLIF(CHARINDEX(',', @StringInput) - 1, -1),
                                LEN(@StringInput)))
        SET @StringInput = SUBSTRING(@StringInput,
                                     ISNULL(NULLIF(CHARINDEX(',', @StringInput), 0),
                                     LEN(@StringInput)) + 1, LEN(@StringInput))

        INSERT INTO @OutputTable ( [String] )
        VALUES ( @String )
    END
    
    RETURN
END

Open in new window

0
 
LVL 10

Accepted Solution

by:
P1ST0LPETE earned 250 total points
ID: 34230475
Here's a complete solution in C# with examples for using "All Items" and "Only Selected Items" in the ListBox.  If you want this to happen on a user triggered event, simply move the code from the Page_Load() event into your desired event handler.

//ASP Markup

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ListBox ID="ListBox1" runat="server" >
            <asp:ListItem Text="Item1" />
            <asp:ListItem Text="Item2" />
        </asp:ListBox>
    </div>
    </form>
</body>
</html>



//Code Behind:

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        StringBuilder items = new StringBuilder();
        bool first = true;

        //Using ALL items from ListBox:
        foreach (ListItem item in ListBox1.Items)
        {
            if (first) first = false;
            else items.Append(", ");
            items.Append("'" + item.Text + "'");
        }

        string sql = "SELECT * FROM [XXX] WHERE [XXX] IN (" + items.ToString() + ")";
        DataTable table = GetTable(sql);

        items = new StringBuilder();
        first = true;

        //Using only the selected items from ListBox:
        foreach (ListItem item in ListBox1.Items)
        {
            if (item.Selected)
            {
                if (first) first = false;
                else items.Append(", ");
                items.Append("'" + item.Text + "'");
            }
        }

        sql = "SELECT * FROM [XXX] WHERE [XXX] IN (" + items.ToString() + ")";
        DataTable table2 = GetTable(sql);
    }

    private DataTable GetTable(string sql)
    {
        DataTable table = new DataTable();
        SqlConnection conn = new SqlConnection("YourDbConnectionString");
        SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);

        try
        {
            adapter.Fill(table);
        }
        catch (Exception ex)
        {
            string error = ex.ToString();
        }
        finally
        {
            adapter.Dispose();
            conn.Dispose();
        }

        return table;
    }
}

Open in new window

0
 
LVL 3

Expert Comment

by:Sokrates
ID: 34230565
hmmm... it took me a while and i came into these findings:

You cannot have a Select Parameter and pass multiple values on to it. Even if it just a parameter, you are using a control parameter which is impossible to do it.

I found a solution for you.... Here it goes:

1)This will be your datasource which need to call the event SqlDataSource1_Selecting
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings %>" ProviderName="<%$ ConnectionStrings:ProviderName %>" SelectCommand="SELECT * FROM XXX" OnSelecting="SqlDataSource1_Selecting">
</asp:SqlDataSource>

2)SqlDataSource1_Selecting event
string myitems = "";
//strings XXX is a string
for (int j = 0; j < listbox.Items.Count; j++) myitems += "'" + listbox.Items[j].Value + "',";
//numbers XXX is a number
//for (int j = 0; j < DropDownList1.Items.Count; j++) myitems += listbox.Items[j].Value + ",";
e.Command.CommandText += " WHERE (XXX IN (" + myitems.Substring(0, myitems.Length-1) + "))";
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

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

In an ASP.NET application, I faced some technical problems. In this article, I list them out and show the solutions that I found.  I hope it will be useful. Problem: After closing a pop-up window, the parent page should be refreshed automaticall…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

789 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