Solved

Oledb query returns no records

Posted on 2009-07-12
6
487 Views
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

Open in new window

0
Comment
Question by:JoeBo747
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 15

Accepted Solution

by:
oobayly earned 500 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();

Open in new window

foo.xls
0
 
LVL 1

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

Open in new window

0
 
LVL 15

Expert Comment

by:jinal
ID: 24834224
can you please attach some part of your excel file over here ?
0
Instantly Create Instructional Tutorials

Contextual Guidance at the moment of need helps your employees adopt to new software or processes instantly. Boost knowledge retention and employee engagement step-by-step with one easy solution.

 
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
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

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

Flash (http://en.wikipedia.org/wiki/Adobe_Flash) has evolved over the years to where it has become a masterful tool for displaying content screen.  It has excellent layout placement, UI precision as well as rendering capabilities. This, along with t…
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
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…

697 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