Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Oledb query returns no records

Posted on 2009-07-12
6
Medium Priority
?
493 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 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();

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
Get your Conversational Ransomware Defense e‑book

This e-book gives you an insight into the ransomware threat and reviews the fundamentals of top-notch ransomware preparedness and recovery. To help you protect yourself and your organization. The initial infection may be inevitable, so the best protection is to be fully prepared.

 
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

Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

Question has a verified solution.

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

This document covers how to connect to SQL Server and browse its contents.  It is meant for those new to Visual Studio and/or working with Microsoft SQL Server.  It is not a guide to building SQL Server database connections in your code.  This is mo…
Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…

618 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