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Neil
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 Posted: Wed Dec 10, 2003 12:32 pm Post subject: TADoDataset.Recordset.Datasource |
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What interfaces does TADODataset.Recordset.Datasource support?
From the msdn literature it looks like it should be an IRowset (as defined
in oledb.pas) however
Rowset := ADODataset1.Recordset.DataSource as IRowset;
where Rowset is an IRowset returns an Interface not supported error.
In fact iterating through all the GUIDs in OLEDB:
for i := Low(GuidArr) to High(GuidArr) do
begin
if Supports(AdoDataset1.Recordset.Datasource, GuidArr[i], Quack) then
ShowMessage(GUIDToString(GuidArr[i]));
end;
where Quack is IUnknown
suggests that it doesn't support any of them.
Any ideas where i'm going wrong?
Thanks
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Viatcheslav V. Vassiliev
Guest
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| Posted: Wed Dec 10, 2003 12:45 pm Post subject: Re: TADoDataset.Recordset.Datasource |
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Recordset.DataSource should implement IDataSource
({7c0ffab3-cd84-11d0-949a-00a0c91110ed}).
You can get OLEDB interfaces
(including IRowset) with ADORecordsetConstruction
({00000283-0000-0010-8000-00AA006D2EA4}) interface (look implementation of
GetProviderNames in ADODB.pas).
To work with OLEDB interfaces without ADO you may try OLEDB Direct
([url]http://www.oledbdirect.com)[/url].
//------------------------------------------
Regards,
Vassiliev V. V.
http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net
http://www.oledbdirect.com - The fastest way to access MS SQL Server,
MS Jet (Access) and Interbase (through OLEDB)
"Neil" <firstname (AT) ggpsystems (DOT) co.uk> сообщил/сообщила в новостях следующее:
news:3fd71214 (AT) newsgroups (DOT) borland.com...
| Quote: | What interfaces does TADODataset.Recordset.Datasource support?
From the msdn literature it looks like it should be an IRowset (as defined
in oledb.pas) however
Rowset := ADODataset1.Recordset.DataSource as IRowset;
where Rowset is an IRowset returns an Interface not supported error.
In fact iterating through all the GUIDs in OLEDB:
for i := Low(GuidArr) to High(GuidArr) do
begin
if Supports(AdoDataset1.Recordset.Datasource, GuidArr[i], Quack) then
ShowMessage(GUIDToString(GuidArr[i]));
end;
where Quack is IUnknown
suggests that it doesn't support any of them.
Any ideas where i'm going wrong?
Thanks
|
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