• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1573
  • Last Modified:

Error on connection string to Btrieve "database"

I am trying to connect to a Btrieve "database" on a server from my Visual Studio .NET C# code on my machine, but I am getting the Error "Data source name not found and no default driver specified".
Here is the connection string that I have:

Driver={Pervasive ODBC-32};DDFPATH=\\<server>\WinMPM22\<folder1>\<folderWithBtrieveFiles>;DATAPATH=\\pbydata1\WinMPM22\<folder1>\<folderWithBtrieveFiles>

I have tried using a connection string specifying the Server and the Database, but it gives the error as well, but I don't understand how it could find the database that way anyways since you have to navigate through several folders to get to it.

The path that I have specified has .DDF files as well as the data files. I am really getting frustrated with this and need a solution fast. Can someone please help?
Thanks,
Jen
0
jenndo
Asked:
jenndo
  • 7
  • 5
  • 5
2 Solutions
 
wayne_freemanCommented:
Hi Jen, it looks like a DSN doesn't exist for that database, which would make it easier.

If OLEDB is available, which it probably is if you're using .NET, you could use a connect string similar to this:

Provider=PervasiveOLEDB;Server=<server>;Data Source=<PathToDDFs> | <DSN Name>;User ID=<userid>;Password=<password>

If you want to use a DSN-less connection, just put the PathToDDFs in the Data Source parameter, or you can create a DSN through the Data Source Manager or ODBC Administrator and insert that DSN Name in the Data Source parameter.

Wayne Freeman
Analytica Business Systems
www.analyticabiz.com
0
 
mirtheilCommented:
A couple of quesitons:
- What version of PSQL/Btrieve are you using?  
- Are you using the OdbcConnection, OleDbConnection, or PsqlConnection object?  

Once you give the version of PSQL you're using, we can help with the Connection string.

The following C# code works for me with PSQL v8 and v9 (using the DSN DEMODATA).
using System;
using System.Data;
using System.IO;

namespace SimpleAdoNetConsole
{
      class Class1
      {
            [STAThread]
            static void Main(string[] args)
            {
                  try
                  {
                        OdbcConnection conn=new OdbcConnection("Driver={Pervasive ODBC Engine Interface};DBQ=DEMODATA;");
                        conn.Open();
                        // Create a SQL command
                        string SQLstr = "";
                        SQLstr = "SELECT * FROM CLASS";

                        OdbcCommand DBCmd = new OdbcCommand(SQLstr, conn);
                        OdbcDataReader myDataReader;
                        myDataReader = DBCmd.ExecuteReader();
                        Console.WriteLine("FieldCount: " + myDataReader.FieldCount.ToString());
                        \while (myDataReader.Read())
                        {
                              for (int i=0;i<myDataReader.FieldCount;i++)
                              {
                                    Console.WriteLine("Field " + i.ToString() + ": " + myDataReader[i].ToString());
                              }
                        }
                        myDataReader.Close();
                        conn.Close();
                        Console.WriteLine("Press Enter to continue");
                        Console.ReadLine();
                  }
                  catch (Exception ex)
                  {
                        Console.WriteLine(ex.Message);
                        Console.ReadLine();
                  }
                  
            }
      }
}
0
 
jenndoAuthor Commented:
I am using version 8 and I am using OdbcConnection.
I am trying to use a DSN-less connection string because I do not have access to the server the database files are on, not to mention I don't want to create a DSN for every database I want to access because there are a lot of them.

Thanks~
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
jenndoAuthor Commented:
Could it possibly have to do with security issues? If so, how would I figure out where the security issue lies?
0
 
mirtheilCommented:
Okay, with PSQL 8, you can't use the "Pervasive ODBC-32" driver because it doesn't exist.  You need to use the "Pervasive ODBC Client Interface" or the "Pervasive ODBC ENgine Interface".  

PSQL v8 doesn't really support using paths. You'd need to create at least a Pervasive Engine DSN on the server. Once you do that, you can use:
"Driver={Pervsive ODBC CLient Interface};ServerName=<servername>;ServerDSN=<serverDSN>"
0
 
jenndoAuthor Commented:
So I would have to create a DSN for every database I want to access?
0
 
mirtheilCommented:
One the server, yes.  How many databases are you trying to access?
0
 
wayne_freemanCommented:
Yes, you would.  There are ways to automate that, though.

This will give you some hints about that:

http://www.analyticabiz.com/Updatearticlesview.php?ID1=51

Wayne
www.analyticabiz.com
0
 
jenndoAuthor Commented:
Well, I'm not exactly sure yet. It could be anywhere between 10 and much more than that. :-/
0
 
wayne_freemanCommented:
If the DSN exists on each server, all you would need is the name of each one.  Are they the same name on every server?

Wayne
0
 
jenndoAuthor Commented:
I'm not sure I understand what you're asking Wayne. The database files exist on one server. I'm understanding that I have to create a DSN for each database on that server.
0
 
wayne_freemanCommented:
Oh, okay, I thought you were accessing a number of servers.  I understand now.

Yes, you have to create a DSN for every database.  My suggestion on ways to automate that still stands, but you would have to weigh the effort of each method of automation against the probably less effort of just doing it through the wizard.

My experience has been that creating one DSN through the wizard and then exporting, modifying, and re-importing the registry entries is fairly easy.

Wayne
0
 
mirtheilCommented:
THere are other ways to automate creating the DSN/DBNs as well using DTO/DTI functions from the Pervasive SDK.  

Are you saying you've got 10+ sets of DDFs and data files and need to access each one?  
0
 
jenndoAuthor Commented:
That is correct.
There is a way I just found out to be able to dynamically create DSN's, but I haven't started messing with it yet to find out if it will work or not. What do the DTO/DTI functions from the Pervasive SDK do?
0
 
mirtheilCommented:
The DTI/DTO functions allow you to create DSNs/DBN on the server from within an application.  With .NET, I would suggest DTO because it's COM based.  DTI would be "unsafe" functions.  
0
 
wayne_freemanCommented:
The DTI is a set of APIs, with which you can do a lot of the database maintenance and configuration from within an application, using embedded DTI/DTO calls to perform administrative functions that would typically require the use of external utilities like the Pervasive Control Center and the ODBC Administrator.

The DTI lets you do things inside an app like create databases, adjust parameters, obtain file handle usage, etc.

The DTO is a set of objects that abstract the DTI functions.

Wayne
www.analyticabiz.com
0
 
jenndoAuthor Commented:
Thanks for the info and help guys!
~Jen
0

Featured Post

Free Backup Tool for VMware and Hyper-V

Restore full virtual machine or individual guest files from 19 common file systems directly from the backup file. Schedule VM backups with PowerShell scripts. Set desired time, lean back and let the script to notify you via email upon completion.  

  • 7
  • 5
  • 5
Tackle projects and never again get stuck behind a technical roadblock.
Join Now