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Oledb query returns no records

Posted on 2009-07-12
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Last Modified: 2012-06-22
Hi

I am using a sample Oledb to query an excel file. The file exists the code runs with no errors but returns no data, can anyone spot an error in the code.

Rgards
JoeBo

Private Const connstring As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=C:\Documents and Settings\joe\My Documents\driver quals-input.xls;Extended Properties=""Excel 8.0;HDR=YES;"""
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try
 
            Dim conn As New OleDbConnection(connstring)
            Dim da As New OleDbDataAdapter("Select * From [Sheet1$]", conn)
            Dim ds As DataSet = New DataSet()
            da.Fill(ds)
            Debug.WriteLine(vbCrLf & "ContactData:" & vbCrLf & "==============")
            Dim dr As DataRow
            For Each dr In ds.Tables(0).Rows
                Debug.WriteLine(dr("Name") & " - " & dr("Mobile No") & " - " & dr("Home No"))
            Next
            conn.Close()
 
        Catch ex As Exception
            MsgBox(Err.Description)
        End Try
    End Sub

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Question by:JoeBo747
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6 Comments
 
LVL 15

Accepted Solution

by:
oobayly earned 2000 total points
ID: 24834018
I can't see anything wrong with the code. I've just tested the following code (it's in C#, but you can get the gist of it) with the attached XLS file, and the Rows array returned contains the correct data.


      string connString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
      @"Data Source=c:\foo.xls;Extended Properties=""Excel 8.0;HDR=YES;""";
 
      OleDbConnection conn = new OleDbConnection(connString);
      OleDbDataAdapter adapter = new OleDbDataAdapter(
        "SELECT * FROM [Sheet1$]", conn);
 
      DataSet ds = new DataSet();
      adapter.Fill(ds);
 
      DataRow[] rows = ds.Tables[0].Select();

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foo.xls
0
 
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Author Comment

by:JoeBo747
ID: 24834078
Hi oobaly
Thanks for your response, I have converted the code supplied to vb.net and attempted to query the file using the code below, I get no rows returned. I am using Excel 2007! Is this an issue(I have saved the workbook as an 2003 style workbook).
Regards
Joe  

 Dim conn As OleDbConnection = New OleDbConnection(connstring)
            Dim adapter = New OleDbDataAdapter("SELECT * FROM [Sheet1$]", conn)
 
            Dim ds As DataSet = New DataSet()
            adapter.Fill(ds)
 
            If ds.Tables(0).Rows.Count > 0 Then
                Dim rows() As DataRow = ds.Tables(0).Select()
 
                MsgBox(rows(0).Item(0).ToString)
            End If

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0
 
LVL 15

Expert Comment

by:jinal
ID: 24834224
can you please attach some part of your excel file over here ?
0
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A DoS is a malicious attempt to prevent the normal operation of a computer system. You may frequently see the terms 'DDoS' (Distributed Denial of Service) and 'DoS' used interchangeably, but there are some subtle differences.

 
LVL 15

Expert Comment

by:oobayly
ID: 24834234
Well, I don't even have Excel installed on my machine, I created the xls file using OpenOffice which allows me to save in "MS Excel 97/2000/XP", and I can't save in a newer versions to test.

I'm not convinced the version of Excel installed on the system should make a difference as you're using the MS Jet DB driver to access an Excel file.

You said "and attempted to query the file using the code below". Do you mean the sample Excel file that I provided, or your own Excel file? If it was the file I provided, I really can't see why nothing is being returned.

If you go to Control Panel -> Administrative Tools -> Data Sources (ODBC) -> Drivers, can you tell me what version of ODBCJT32.dll you're using, not that I'm entirely convinced that's the issue either.
0
 
LVL 1

Author Comment

by:JoeBo747
ID: 24836109
Hi oobaly
I am using  4.00.6305.00 dll the file I am trying to query is  both the file you supplied (foo.xls)and my own file!
Regards
Joebo
0
 
LVL 1

Author Comment

by:JoeBo747
ID: 24836290
Hi
I believe I may have fallen for excels positive indexing style because when I look at the table using

Dim rows() As DataRow = ds.Tables(1).Select()

Rather than

Dim rows() As DataRow = ds.Tables(0).Select()


I return a value as expected!

Thanks for your time
Joebo
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