How to check if an OLEDB driver is installed on the system?

Question

How can I make sure that a certain OLEDB driver is installed when I start my application? I use ADO from Delphi and would like to display a descriptive error message if the driver is missing. The error that's returned from ADO isn't always that user-friendly.

There are probably a nice little function that returns all installed drivers but I haven't found it.

Fulgent

Just to make sure, and for everyone else coming later, if you're using ADO, and you do decide to use the modern MSOLEDBSQL driver (or the older SQLNCLI11, SQLNCLI10, SQLNCLI drivers), be sure to include DataTypeCompatibility=80 in your connection string. ADO doesn't understand some of the newer DBTYPE_xxx constants that the modern drivers will return; and Microsoft is committed to not updating ADO - so no fixes coming. Hence by the SQL Server team added DataTypeCompatibility connection string option. MSDN: Using ADO with SQL Server Native Client – Ascent

Answer 1

Each provider has a GUID associated with its class. To find the guid, open regedit and search the registry for the provider name. For example, search for "Microsoft Jet 4.0 OLE DB Provider". When you find it, copy the key (the GUID value) and use that in a registry search in your application.

function OleDBExists : boolean;
var
  reg : TRegistry;
begin
  Result := false;

  // See if Advantage OLE DB Provider is on this PC
  reg := TRegistry.Create;
  try
    reg.RootKey := HKEY_LOCAL_MACHINE;
    Result := reg.OpenKeyReadOnly( '\SOFTWARE\Classes\CLSID\{C1637B2F-CA37-11D2-AE5C-00609791DC73}' );
  finally
    reg.Free;
  end;
end;

Daw

Answer 2

This is an old question but I had the same problem now and maybe this can help others.

In Delphi 7 there is an procedure in ADODB that return a TStringList with the provider names.

Usage example:

names := TStringList.Create;
ADODB.GetProviderNames(names);

if names.IndexOf('SQLNCLI10')<>-1 then
  st := 'Provider=SQLNCLI10;'
else if names.IndexOf('SQLNCLI')<>-1 then
  st := 'Provider=SQLNCLI;'
else if names.IndexOf('SQLOLEDB')<>-1 then
  st := 'Provider=SQLOLEDB;';

Prinz

Nice of you to post the answer -- even though it's literally years later. – Bubbler

Answer 3

You can get a ADO provider name and check it in registry at path HKEY_CLASSES_ROOT\[Provider_Name].

Plait

Answer 4

Wouldn't the easiest way just be trying to make a connection at start-up and catching the error?

I mean you might get a few different errors back depending on, for example, the user is online, but they're cases that you should be able to test for.

Symphonist

Answer 5

I believe the OLEDB objects in question are buried someplace in the registry, since OLEDB / ADO is a COM solution. My guess would be to see if you can find the GUID that your driver is installed as in the registry.

Jat

Answer 6

namespace Common {
  public class CLSIDHelper {

  [DllImport("ole32.dll")]
  static extern int CLSIDFromProgID([MarshalAs(UnmanagedType.LPWStr)] string lpszProgID, out Guid pclsid);


  public static Guid RetrieveGUID(string Provider) {
    Guid CLSID = Guid.Empty;
    int Ok = CLSIDFromProgID(Provider, out CLSID);
    if (Ok == 0)
       return CLSID;
    return null;
  }
 }
}

Tragic