Solved

VFPOLEDB select deleted records

Posted on 2007-11-19
5
1,491 Views
Last Modified: 2008-02-01
Experts
I am using the VFPOLDB driver to connect to fox pro tables, to my understanding by default when running a select statement it will not return deleted records, how do you change this setting?  Is there something in the connection string that needs to be changed?
Thanks!
0
Comment
Question by:SZachmann
  • 3
  • 2
5 Comments
 
LVL 53

Expert Comment

by:Dhaest
ID: 20372401
How can you return deleted records ?
Do those records have a special status ?
0
 
LVL 2

Author Comment

by:SZachmann
ID: 20373318
Dhaest,

Yes, in Foxpro "deleted" records are really just records that are marked for deletion meaning that they will be permanently deleted next time the "PACK" command is run on that table.  If you were to look at the raw records in VFP 8.0 for instance, you would see the records however there would be a small black mark next to the ones that are marked for deletion.  These are the records that the VFPOLEDB driver does not seem to return.
0
 
LVL 53

Accepted Solution

by:
Dhaest earned 500 total points
ID: 20373363
Here's some example VB code to work with the deleted status of a row:

Source: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1566422&SiteID=1
  Try
 
   Dim cn1 As New OleDbConnection( _
    "Provider=VFPOLEDB.1;Data Source=C:\Temp\;")
   cn1.Open()
   '-- Make some VFP data to play with
   Dim cmd1 As New OleDbCommand( _
    "Create Table TestDBF (Field1 I, Field2 C(10))", cn1)
   Dim cmd2 As New OleDbCommand( _
    "Insert Into TestDBF Values (1, 'Hello')", cn1)
   Dim cmd3 As New OleDbCommand( _
    "Insert Into TestDBF Values (2, 'World')", cn1)
   Dim cmd4 As New OleDbCommand( _
    "Delete From TestDBF Where Field1 = 1", cn1)
   cmd1.ExecuteNonQuery()
   cmd2.ExecuteNonQuery()
   cmd3.ExecuteNonQuery()
   cmd4.ExecuteNonQuery()
   cn1.Close()
 
   Dim cn2 As New OleDbConnection( _
    "Provider=VFPOLEDB.1;Data Source=C:\Temp\;")
   cn2.Open()
 
   Dim cmd5 As New OleDbCommand( _
    "Select * From TestDBF", cn2)
   Dim da1 As New OleDbDataAdapter(cmd5)
   Dim ds1 As New DataSet
   Dim dr1 As DataRow
   da1.Fill(ds1)
   For Each dr1 In ds1.Tables(0).Rows
    Console.WriteLine( _
     dr1.Item(0).ToString() & ", " & dr1.Item(1).ToString)
   Next
   Console.ReadLine()
   cn2.Close()
 
   Dim cn3 As New OleDbConnection( _
    "Provider=VFPOLEDB.1;Data Source=C:\Temp\;")
   cn3.Open()
 
   Dim cmd6 As New OleDbCommand( _
    "Set Deleted Off", cn3)
   cmd6.ExecuteNonQuery()
   Dim cmd7 As New OleDbCommand( _
      "Select Deleted('TestDBF') As IsDeleted, TestDBF.* From TestDBF", cn3)
   Dim da2 As New OleDbDataAdapter(cmd7)
   Dim ds2 As New DataSet
   Dim dr2 As DataRow
   da2.Fill(ds2)
   For Each dr2 In ds2.Tables(0).Rows
    Console.WriteLine( _
    dr2.Item(0).ToString() & ", " & dr2.Item(1).ToString() & ", " & dr2.Item(2).ToString())
   Next
   Console.ReadLine()
   cn2.Close()
 
  Catch e As Exception
   MsgBox(e.ToString())
  End Try

Open in new window

0
 
LVL 2

Author Comment

by:SZachmann
ID: 20373417
I see, so basically you're opening your connection and executing several commands, each defined as a separate oledbcommand object.  I'm really wasn't familiar with doing that as I typically just expect to connect to a DB, run a single command (usually a select) and get my data.  I'll give that a try and let you know if it works, but it makes sense to me seeing the code.
0
 
LVL 2

Author Comment

by:SZachmann
ID: 20373571
I tested the code you sent and it worked perfectly.  Thanks for the help!
0

Featured Post

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

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

Suggested Solutions

Microsoft Reports are based on a report definition, which is an XML file that describes data and layout for the report, with a different extension. You can create a client-side report definition language (*.rdlc) file with Visual Studio, and build g…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …
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…

803 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