No results from sql query

Hi.
Got a small problem here. Trying to read data from an Access 2007 database but I'm getting nowhere.
What I do know is that everything is spelled correctly and that the database actually contains data.
I get no error and the form launches but the labeltext is not changed.

thanks

btw, Using VS 2008

Code:

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Imports System.Data.OleDb
Public Class Form1
    Private conStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\SoccerQuiz.accdb;Jet OLEDB:Database Password=I_hate_Inter"
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        ReadData(conStr, "SELECT * FROM Tabell")

    End Sub
    Public Sub ReadData(ByVal connectionString As String, _
                    ByVal queryString As String)
        Using connection As New OleDbConnection(connectionString)
            Dim command As New OleDbCommand(queryString, connection)

            connection.Open()
            Dim reader As OleDbDataReader = command.ExecuteReader()
            While reader.Read()
                lblTest.Text = reader(0).ToString()
                'Console.WriteLine(reader(0).ToString())
            End While
            reader.Close()
        End Using
    End Sub
End Class

---

this code doesn't work either:

Code:

---

        conn = New OleDbConnection(connstring)
        conn.Open()
        Dim cmd As New OleDbCommand(sql_query, conn)
        Try
            Dim reader As OleDbDataReader = cmd.ExecuteReader()
            While reader.Read()
                MessageBox.Show(reader.GetValue(0).ToString())
            End While
            reader.Close()
        Catch err As OleDbException
            MessageBox.Show(err.Message)
        Finally
            conn.Close()
        End Try

---

Try this

Code:

---

Imports System.Data.OleDb

Public Class Form1

    Private connstring As String = "Your connection string"
    Private conn As OleDb.OleDbConnection

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        conn = New OleDbConnection(connstring)
        conn.Open()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim sSQL As String = String.Empty
        sSQL = "SELECT * FROM Tabell "
        Dim command As New OleDbCommand(sSQL, conn)
        Dim reader As OleDbDataReader = command.ExecuteReader()
        ListBox1.Items.Clear()
      If reader.HasRows = True Then 'make sure there is data returned
            While reader.Read()
                      ListBox1.Items.Add(reader.GetString(0))
              End While
      Else
              MessageBox.Show("No data matched your search criteria.")
      End If
        reader.Close()
    End Sub
End Class

---

You are returned multiple records so I would suggest using something other than a label.

Thanks Hack.
While this did not solve my problem I now get errors that I can try to resolve. For example "Microsoft.ACE.OLEDB.12.0-provider is not registerd on the computer". (Wich I guess is a big reason why it wont work :) ). I will try to figure this out in the morning. If someone knows how to fix this so that I don't need to spend an hour on Google I would be a very hapy dude :)
Thanks again.

Quote:

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Originally Posted by Rossonero

Thanks Hack.
While this did not solve my problem I now get errors that I can try to resolve. For example "Microsoft.ACE.OLEDB.12.0-provider is not registerd on the computer". (Wich I guess is a big reason why it wont work :) ). I will try to figure this out in the morning. If someone knows how to fix this so that I don't need to spend an hour on Google I would be a very hapy dude :)
Thanks again.

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That means that the system it's being run on doesn't have any Office drivers installed. To get the Access 2007 OLEDB provider you have to either install Access 2007 or the Office driver pack.

http://www.microsoft.com/downloads/d...displaylang=en

With regards to your original issue, you were using a While loop and testing the result of the DataReader's Read method. Most likely the method never returned True so the loop was never entered. That means that the query returned no data. You can confirm that by testing the reader's HasRows property.

Thanks everybody.