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Exposing tabular data from your COM object - Part 2

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28 Jul 2000CPOL 95.2K   1.1K   33  
The ATL OLE DB Provider templates appear to rely on the fact that your data is kept in a simple array, but that's not really the case at all!
// ConversionProviderDS.h : Declaration of the CConversionProviderSource
#ifndef __CConversionProviderSource_H_
#define __CConversionProviderSource_H_
#include "resource.h"       // main symbols
#include "ConversionProviderRS.h"
/////////////////////////////////////////////////////////////////////////////
// CDataSource
class ATL_NO_VTABLE CConversionProviderSource : 
	public CComObjectRootEx<CComSingleThreadModel>,
	public CComCoClass<CConversionProviderSource, &CLSID_ConversionProvider>,
	public IDBCreateSessionImpl<CConversionProviderSource, CConversionProviderSession>,
	public IDBInitializeImpl<CConversionProviderSource>,
	public IDBPropertiesImpl<CConversionProviderSource>,
	public IPersistImpl<CConversionProviderSource>,
	public IInternalConnectionImpl<CConversionProviderSource>
{
public:
	HRESULT FinalConstruct()
	{
		return FInit();
	}
DECLARE_REGISTRY_RESOURCEID(IDR_CONVERSIONPROVIDER)
BEGIN_PROPSET_MAP(CConversionProviderSource)
	BEGIN_PROPERTY_SET(DBPROPSET_DATASOURCEINFO)
		PROPERTY_INFO_ENTRY(ACTIVESESSIONS)
		PROPERTY_INFO_ENTRY(DATASOURCEREADONLY)
		PROPERTY_INFO_ENTRY(BYREFACCESSORS)
		PROPERTY_INFO_ENTRY(OUTPUTPARAMETERAVAILABILITY)
		PROPERTY_INFO_ENTRY(PROVIDEROLEDBVER)
		PROPERTY_INFO_ENTRY(DSOTHREADMODEL)
		PROPERTY_INFO_ENTRY(SUPPORTEDTXNISOLEVELS)
		PROPERTY_INFO_ENTRY(USERNAME)
	END_PROPERTY_SET(DBPROPSET_DATASOURCEINFO)
	BEGIN_PROPERTY_SET(DBPROPSET_DBINIT)
		PROPERTY_INFO_ENTRY(AUTH_PASSWORD)
		PROPERTY_INFO_ENTRY(AUTH_PERSIST_SENSITIVE_AUTHINFO)
		PROPERTY_INFO_ENTRY(AUTH_USERID)
		PROPERTY_INFO_ENTRY(INIT_DATASOURCE)
		PROPERTY_INFO_ENTRY(INIT_HWND)
		PROPERTY_INFO_ENTRY(INIT_LCID)
		PROPERTY_INFO_ENTRY(INIT_LOCATION)
		PROPERTY_INFO_ENTRY(INIT_MODE)
		PROPERTY_INFO_ENTRY(INIT_PROMPT)
		PROPERTY_INFO_ENTRY(INIT_PROVIDERSTRING)
		PROPERTY_INFO_ENTRY(INIT_TIMEOUT)
	END_PROPERTY_SET(DBPROPSET_DBINIT)
	CHAIN_PROPERTY_SET(CConversionProviderCommand)
END_PROPSET_MAP()
BEGIN_COM_MAP(CConversionProviderSource)
	COM_INTERFACE_ENTRY(IDBCreateSession)
	COM_INTERFACE_ENTRY(IDBInitialize)
	COM_INTERFACE_ENTRY(IDBProperties)
	COM_INTERFACE_ENTRY(IPersist)
	COM_INTERFACE_ENTRY(IInternalConnection)
END_COM_MAP()
public:
};
#endif //__CConversionProviderSource_H_

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Software Developer (Senior) JetByte Limited
United Kingdom United Kingdom
Len has been programming for over 30 years, having first started with a Sinclair ZX-80. Now he runs his own consulting company, JetByte Limited and has a technical blog here.

JetByte provides contract programming and consultancy services. We can provide experience in COM, Corba, C++, Windows NT and UNIX. Our speciality is the design and implementation of systems but we are happy to work with you throughout the entire project life-cycle. We are happy to quote for fixed price work, or, if required, can work for an hourly rate.

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