Senden von Daten an FILESTREAM: eine ISequentialStream-Schnittstelle, die an ICommandText gebunden ist

Gilt für: SQL Server Azure SQL-Datenbank Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)

OLE DB-Treiber herunterladen

Dieses Beispiel verwendet eine ISequentialStream-Schnittstelle, die an einen ICommandText-Parameter gebunden ist und dazu dient, zwischen 4 MB und 4 GB Daten an eine FILESTREAM-Spalte zu senden.

Weitere Informationen zum Filestream-Feature finden Sie unter FILESTREAM-Unterstützung.

Beispiel

Aktivieren Sie die FILESTREAM-Unterstützung, bevor Sie dieses Beispiel kompilieren und ausführen (Aktivieren und Konfigurieren von FILESTREAM).

Stellen Sie sicher, dass die INCLUDE-Umgebungsvariable das Verzeichnis einschließt, das „msoledbsql.h“ enthält.

Der Server muss ein Verzeichnis mit dem Namen C:\DBFsa aufweisen; dort erstellt das Beispiel die Datenbank. Die Instanz von SQL Server muss Schreibzugriff auf diesen Speicherort haben (melden Sie sich z. B. als lokales Systemkonto an).

Kopieren Sie das erste Codelisting, und fügen Sie es in eine Datei mit dem Namen ISSHelper.h ein.

Kopieren Sie das zweite Codelisting, und fügen Sie es in eine Datei mit dem Namen ISSHelper.cpp ein.

Kopieren Sie das dritte Codelisting, und fügen Sie es in eine Datei mit dem Namen ICommandUpload.cpp ein.

Kompilieren Sie ICommandUpload.cpp, ISSHelper.cpp, ole32.lib und oleaut32.lib.

Wenn Sie dieses Beispiel ausführen, müssen Sie den Namen eines Servers oder Server\Instanzname sowie einen Wert zwischen 4 MB (0x400001) und 4 GB (0xFFFFFFFF) übergeben, der die Menge der zu schreibenden Daten angibt.

Das vierte Codelisting (Transact-SQL) löscht die in diesem Beispiel erstellte Datenbank.

// ISSHelper.h: interface for the CISSHelper class.  
  
#if !defined(AFX_ISSHELPER_H__7B88E5F3_263F_11D2_9D1F_00C04F96B8B2__INCLUDED_)  
#define AFX_ISSHELPER_H__7B88E5F3_263F_11D2_9D1F_00C04F96B8B2__INCLUDED_  
  
#if _MSC_VER > 1000  
#pragma once  
#endif // _MSC_VER > 1000  
  
class CISSHelper : public ISequentialStream {  
public:  
   CISSHelper(__int64 i64LobBytes);  
   virtual ~CISSHelper();  
  
   // Helper function to clean up memory.  
   virtual void Clear();  
  
   // ISequentialStream interface implementation.  
   STDMETHODIMP_(ULONG) AddRef(void);  
   STDMETHODIMP_(ULONG) Release(void);  
   STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppv);  
   STDMETHODIMP Read(   
      /* [out] */ void __RPC_FAR *pv,  
      /* [in] */ ULONG cb,  
      /* [out] */ ULONG __RPC_FAR *pcbRead);  
   STDMETHODIMP Write(   
      /* [in] */ const void __RPC_FAR *pv,  
      /* [in] */ ULONG cb,  
      /* [out] */ ULONG __RPC_FAR *pcbWritten);  
  
public:  
   void * m_pBuffer;   // Buffer  
   ULONG m_ulLength;   // Total buffer size.  
   ULONG m_ulStatus;   // Column status.  
  
   __int64 m_i64BytesUploaded;  
   __int64 m_i64LastPrintUploaded;  
   __int64 m_i64ThreshHold;  
   DWORD m_dwStartTick;  
   DWORD m_dwParamOrdinal;  
  
private:  
   ULONG m_cRef;   // Reference count (not used).  
   ULONG m_iReadPos;   // Current index position for reading from the buffer.  
   ULONG m_iWritePos;   // Current index position for writing to the buffer.  
  
};  
  
#endif   // !defined(AFX_ISSHELPER_H__7B88E5F3_263F_11D2_9D1F_00C04F96B8B2__INCLUDED_)  

// ISSHelper.cpp: implementation of the CISSHelper class.  
  
#pragma once  
  
#include <windows.h>  
#include <stdio.h>      // printf(...)  
#include <stddef.h>     // offsetof(...)  
#include <conio.h>      // _getch()  
#include <oledb.h>      // OLEDB  
#include <oledberr.h>   // OLEDB  
#include <objbase.h>    // CoInitializeEx()  
#include <msdasc.h>     // IDataInitialize  
#include <msdadc.h>     // OLEDB conversion library header.  
#include <msdaguid.h>   // OLEDB conversion library guids.  
  
#include "ISSHelper.h"  
  
#ifdef _DEBUG  
#undef THIS_FILE  
static char THIS_FILE[]=__FILE__;  
#define new DEBUm_NEW  
#endif  
  
// Class CISSHelper  
// Implementation of ISequentialStream interface  
  
CISSHelper::CISSHelper(__int64 i64LobBytes) {  
   m_cRef = 0;  
   m_pBuffer = NULL;  
   m_ulLength = 0;  
   m_ulStatus = DBSTATUS_S_OK;  
   m_iReadPos = 0;  
   m_iWritePos = 0;  
   m_i64ThreshHold = i64LobBytes;  
   m_i64BytesUploaded = 0;  
   m_i64LastPrintUploaded = 0;  
   m_dwStartTick = 0;  
   m_dwParamOrdinal = 0;  
}  
  
CISSHelper::~CISSHelper() {  
   Clear();  
}  
  
void CISSHelper::Clear() {  
   CoTaskMemFree( m_pBuffer );  
   m_cRef = 0;  
   m_pBuffer = NULL;  
   m_ulLength = 0;  
   m_ulStatus = DBSTATUS_S_OK;  
   m_iReadPos = 0;  
   m_iWritePos = 0;  
}  
  
ULONG CISSHelper::AddRef() {  
   return ++m_cRef;  
}  
  
ULONG CISSHelper::Release() {  
   return --m_cRef;  
}  
  
HRESULT CISSHelper::QueryInterface( REFIID riid, void** ppv ) {  
   *ppv = NULL;  
   if ( riid == IID_IUnknown ) *ppv = this;  
   if ( riid == IID_ISequentialStream ) *ppv = this;  
  
   if ( *ppv ) {  
      ( (IUnknown*) *ppv )->AddRef();  
      return S_OK;  
   }  
   return E_NOINTERFACE;  
}  
  
HRESULT CISSHelper::Read( void *pv, ULONG cb, ULONG* pcbRead ) {  
   // Check parameters.  
   if ( pcbRead ) *pcbRead = 0;  
   if ( !pv ) return STG_E_INVALIDPOINTER;  
   if ( 0 == cb ) return S_OK;   
  
   // Cut out now if threshold is hit.  
   __int64 left = m_i64ThreshHold-m_i64BytesUploaded;  
   if (left < cb)  
      cb = (ULONG)left;  
  
   if (0 == m_dwStartTick)  
      m_dwStartTick = GetTickCount();  
  
   m_i64BytesUploaded += cb;  
  
   if (( m_i64BytesUploaded - m_i64LastPrintUploaded ) >= (1024*1024*4))  {  
      __int64 i64Elapsed = (__int64) GetTickCount()-m_dwStartTick;  
      __int64 i64BytesPerSecond = m_i64BytesUploaded*1000/i64Elapsed;  
      printf("Param=%lu TotalBytes=%010I64u ElapsedMS=%010I64u BytesPerSec=%010I64u\n",   
         m_dwParamOrdinal, m_i64BytesUploaded, i64Elapsed, i64BytesPerSecond );  
      m_i64LastPrintUploaded = m_i64BytesUploaded;  
   }  
  
   if ( cb == left ) {  
      __int64 i64Elapsed = (__int64) GetTickCount()-m_dwStartTick;  
      __int64 i64BytesPerSecond = m_i64BytesUploaded * 1000 / i64Elapsed > 0 ? i64Elapsed : 1;  
      printf("Last read:\nParam=%lu TotalBytes=%010I64u ElapsedMS=%010I64u BytesPerSec=%010I64u\n",   
         m_dwParamOrdinal, m_i64BytesUploaded, i64Elapsed, i64BytesPerSecond );  
      m_i64LastPrintUploaded = m_i64BytesUploaded;  
    }  
  
*pcbRead = cb;  
return S_OK;  
}  
  
HRESULT CISSHelper::Write( const void *pv, ULONG cb, ULONG* pcbWritten ) {  
   // Check parameters.  
   if ( !pv ) return STG_E_INVALIDPOINTER;  
   if ( pcbWritten ) *pcbWritten = 0;  
   if ( 0 == cb ) return S_OK;  
  
   // Enlarge the current buffer.  
   m_ulLength += cb;  
  
   // Grow internal buffer to new size.  
   m_pBuffer = CoTaskMemRealloc( m_pBuffer, m_ulLength );  
  
   // Check for out of memory situation.  
   if ( NULL == m_pBuffer ) {  
      Clear();  
      return E_OUTOFMEMORY;  
   }  
  
   // Copy callers memory to internal buffer and update write position.  
   memcpy( (void*)((BYTE*)m_pBuffer + m_iWritePos), pv, cb );  
   m_iWritePos += cb;  
  
   // Return bytes written to caller.  
   if ( pcbWritten ) *pcbWritten = cb;  
  
   return S_OK;  
}  

// ICommandUpload.cpp  
#pragma once  
  
#include <windows.h>  
#include <stdio.h>      // printf(...)  
#include <stddef.h>     // offsetof(...)  
#include <conio.h>      // _getch()  
#include <oledb.h>      // OLEDB  
#include <oledberr.h>   // OLEDB  
#include <objbase.h>    // CoInitializeEx()  
#include <msdasc.h>     // IDataInitialize  
#include <msdadc.h>     // OLEDB conversion library header.  
#include <msdaguid.h>   // OLEDB conversion library guids.  
  
#define DBINITCONSTANTS  
#include <msoledbsql.h>  
#include "ISSHelper.h"  
  
// Simple data record used by DumpRowset function.  
#define MAX_DATA_LENGTH 8096  
struct DATA_REC {  
   DWORD status;  
   DWORD length;  
   BYTE Data[MAX_DATA_LENGTH];  
};  
  
// Helper macros for COM/OLEDB.  
#define SAFE_RELEASE(x)    { if (x) { x->Release(); x = NULL; } }  
#define SAFE_SYSFREE(bstr) { if (bstr) { ::SysFreeString(bstr); bstr = NULL; } }  
#define CHECK_HR(hr,jump)  { if ( FAILED(hr) ) goto jump; }  
#define CHECK_HR_ERR(hr,jump)  { if ( FAILED(hr) ) { DumpErrorRecords(); goto jump; } }  
  
#define CLEAR_PROPS(x) { for ( int i=0; i<x; i++ ) VariantClear( &InitProperties[i].vValue ); }  
  
#define SET_BSTR_PROP(index,propid,value) { \  
   InitProperties[index].dwOptions = DBPROPOPTIONS_REQUIRED; \  
   InitProperties[index].colid = DB_NULLID; \  
   InitProperties[index].dwStatus = DBPROPSTATUS_OK; \  
   InitProperties[index].dwPropertyID = propid; \  
   InitProperties[index].vValue.vt = VT_BSTR; \  
   InitProperties[index].vValue.bstrVal = SysAllocString(value); }  
  
// Helper function for DumpErrorRecords() to convert a clisd to string representation of clsid.  
LPWSTR CLSIDToString( CLSID* pclsid ) {  
   static WCHAR wszCLSID[1024];  
   if ( NULL == pclsid )  
      wcscpy_s(wszCLSID, 1024, L"(Null)");  
   else  
      ::StringFromGUID2( *pclsid, (OLECHAR*)wszCLSID, sizeof(wszCLSID) );  
   return wszCLSID;  
}  
  
// Helper function to dump out OLE DB errors to console window.  
HRESULT DumpErrorRecords() {  
   HRESULT hr = S_OK;  
   IErrorRecords * pIErrorRecords = NULL;  
   IErrorInfo * pIErrorInfo = NULL;  
   IErrorInfo * pIErrorInfoRecord = NULL;  
   BSTR bstrDescription = NULL;  
   BSTR bstrSource = NULL;  
   ULONG i;  
   ULONG cRecords = 0;  
   LCID lcid = 0;  
   ERRORINFO ErrorInfo;  
  
   // Get IErrorInfo pointer from OLE.  
   hr = ::GetErrorInfo( 0, &pIErrorInfo );  
   if ( FAILED(hr) ) {  
      printf( "No error records found.\n" );  
      goto DumpErrorRecordsExit;  
   }  
  
   // QI for IID_IErrorRecords.  
   hr = pIErrorInfo->QueryInterface( IID_IErrorRecords, (void**)&pIErrorRecords );  
   if ( FAILED(hr) ) {  
      printf( "pIErrorInfo->QueryInterface(IID_IErrorRecords) failed with hr=0x%08x.\n", hr );  
      goto DumpErrorRecordsExit;  
   }  
  
   // Get error record count.  
   hr = pIErrorRecords->GetRecordCount( &cRecords );  
   if ( FAILED(hr) ) {  
      printf( "pIErrorRecords->GetRecordCount() failed with hr=0x%08x.\n", hr );  
      goto DumpErrorRecordsExit;  
   }  
  
   // Get system LCID  
   lcid = GetSystemDefaultLCID();   
  
   //Loop through the error records.  
   for ( i = 0 ; i < cRecords ; i++ ) {  
      // Get pIErrorInfo from pIErrorRecords.  
      hr = pIErrorRecords->GetErrorInfo( i, lcid, &pIErrorInfoRecord );  
  
      if ( SUCCEEDED(hr) ) {  
         // Get error description and source.  
         hr = pIErrorInfoRecord->GetDescription( &bstrDescription );  
         hr = pIErrorInfoRecord->GetSource( &bstrSource );  
  
         // Retrieve the ErrorInfo structures.  
         hr = pIErrorRecords->GetBasicErrorInfo( i, &ErrorInfo );  
  
         // Dump out error.  
         printf( "\n" );  
         printf( "Dumping error record %lu of %lu:\n", i+1, cRecords );  
         printf( "--------------------------------------------------------------------------\n" );  
         printf( "   Description = %S\n", bstrDescription );  
         printf( "   Source      = %S\n", bstrSource );  
         printf( "   ERRORINFO.hrError = 0x%08x\n", ErrorInfo.hrError );  
         printf( "   ERRORINFO.dwMinor = %lu\n",ErrorInfo.dwMinor );   
         printf( "   ERRORINFO.clsid   = %S\n",CLSIDToString( &ErrorInfo.clsid ) );  
  
         SAFE_RELEASE(pIErrorInfoRecord);  
         SAFE_SYSFREE(bstrDescription);  
         SAFE_SYSFREE(bstrSource);  
      }  
   }  
  
DumpErrorRecordsExit:  
   SAFE_RELEASE(pIErrorInfoRecord);  
   SAFE_RELEASE(pIErrorRecords);  
   SAFE_RELEASE(pIErrorInfo);  
   SAFE_RELEASE(pIErrorInfo);  
   SAFE_SYSFREE(bstrDescription);  
   SAFE_SYSFREE(bstrSource);  
   return hr;  
}  
  
// Helper function to execute a sql command.  
HRESULT ExecuteSQL( IDBCreateCommand* pIDBCreateCommand, LPCOLESTR pwszCommand  ) {  
   HRESULT hr;  
   ICommandText* pICommandText = NULL;  
   hr = pIDBCreateCommand->CreateCommand( NULL, IID_ICommandText, (IUnknown**)&pICommandText );  
   CHECK_HR(hr,ExecuteSQLCleanup);  
   hr = pICommandText->SetCommandText( DBGUID_DBSQL, pwszCommand );  
   CHECK_HR(hr,ExecuteSQLCleanup);  
   hr = pICommandText->Execute( NULL, IID_NULL, NULL, NULL, NULL );  
  
ExecuteSQLCleanup:  
   SAFE_RELEASE(pICommandText);  
   return hr;  
}  
  
HRESULT OpenSessionSSHelper( IDBProperties*pIDBProperties, IDBCreateCommand** ppIDBCreateCommand, const wchar_t* szServer ) {  
#define TOTAL_SS_PROPS 3  
   HRESULT hr;  
   IDBInitialize * pIDBInitialize = NULL;    
   IDBCreateSession * pIDBCreateSession = NULL;  
   DBPROP InitProperties[TOTAL_SS_PROPS];  
   DBPROPSET InitPropSet;  
  
   if ( NULL == pIDBProperties )       
      return E_INVALIDARG;  
  
   if ( NULL == ppIDBCreateCommand )   
      return E_INVALIDARG;  
  
   // NULL our out param in case of failure.  
   *ppIDBCreateCommand = NULL;  
  
   // Hard coded this to point to local sql server, change as needed.  
   SET_BSTR_PROP( 0, DBPROP_INIT_DATASOURCE, szServer );  
   SET_BSTR_PROP( 1, DBPROP_INIT_CATALOG, L"master" );  
   SET_BSTR_PROP( 2, DBPROP_AUTH_INTEGRATED, L"SSPI" );  
  
   InitPropSet.guidPropertySet = DBPROPSET_DBINIT;   
   InitPropSet.cProperties = TOTAL_SS_PROPS;  
   InitPropSet.rgProperties = InitProperties;  
  
   // Set initialization properties.   
   hr = pIDBProperties->SetProperties( 1, &InitPropSet );  
   CHECK_HR_ERR(hr,OpenSessionSSHelperCleanup);  
  
   // Clean up allocated variants.  
   CLEAR_PROPS( TOTAL_SS_PROPS );  
  
   // Initialize the DataSource.  
   hr = pIDBProperties->QueryInterface( IID_IDBInitialize, (void**) &pIDBInitialize );  
   CHECK_HR_ERR(hr,OpenSessionSSHelperCleanup);  
  
   hr = pIDBInitialize->Initialize();  
   CHECK_HR_ERR(hr,OpenSessionSSHelperCleanup);  
  
   // QI for IID_IDBCreateSession and then create session.  
   hr = pIDBInitialize->QueryInterface( IID_IDBCreateSession, (void**) &pIDBCreateSession );  
   CHECK_HR(hr,OpenSessionSSHelperCleanup);  
  
   hr = pIDBCreateSession->CreateSession( NULL, IID_IDBCreateCommand, (IUnknown**)ppIDBCreateCommand );  
  
OpenSessionSSHelperCleanup:  
  
   SAFE_RELEASE( pIDBInitialize );  
   SAFE_RELEASE( pIDBCreateSession );  
   return hr;      
}  
  
// Helper function to open a SS session.  
HRESULT OpenSessionSS( IDBCreateCommand** ppIDBCreateCommand, const wchar_t* szServer ) {  
   HRESULT hr;  
   IDBProperties * pIDBProperties = NULL;  
  
   // Null our out param in case we fail.  
   if ( NULL == ppIDBCreateCommand )   
      return E_INVALIDARG;  
  
   // Co-create MSOLEDBSQL.  
   hr = CoCreateInstance( MSOLEDBSQL_CLSID, NULL, CLSCTX_INPROC_SERVER, IID_IDBProperties,   
      (void **) &pIDBProperties );      
   CHECK_HR_ERR(hr,OpenSessionSSCleanup);  
  
   // Call helper to open session.  
   hr = OpenSessionSSHelper( pIDBProperties, ppIDBCreateCommand, szServer );  
  
OpenSessionSSCleanup:  
  
   SAFE_RELEASE( pIDBProperties );  
   return hr;  
}  
  
void wmain(int argc, wchar_t* argv[]) {  
#define PARAM_COUNT 2  
   HRESULT hr;  
   IDBCreateCommand * pIDBCreateCommand = NULL;  
   ICommandText * pICommandText = NULL;  
   ICommandPrepare * pICommandPrepare = NULL;  
   IAccessor * pIAccessor = NULL;  
  
   HACCESSOR hAccessor;  
   DBBINDING dbBind[PARAM_COUNT];  
   DBPARAMS dbParams;  
  
   if ( argc < 3 ) {  
      wprintf( L"Usage: ICommandUpload <server> <size>\n");  
      return;  
   }  
  
   unsigned __int64 size = _wcstoui64( argv[2], NULL, 16 ) ;  
   if ( size <= (1024*1024*4) ) {  
      wprintf( L"size must be at least 4MB (either it's too small or it's not a well formed number)\n" );  
      return;  
   }  
  
   CISSHelper issHelper1( size );  
   CoInitialize(NULL);  
  
   // Open connection to SS database.  
   hr = OpenSessionSS( &pIDBCreateCommand, argv[1] );  
   CHECK_HR_ERR(hr,MainCleanup);  
  
   // Enable filestreaming, drop and recreate the database and table  
   hr = ExecuteSQL( pIDBCreateCommand, L"exec sp_configure 'filestream access level', 2" );  
  
   CHECK_HR_ERR( hr, MainCleanup );  
   hr = ExecuteSQL( pIDBCreateCommand, L"reconfigure" );  
   CHECK_HR_ERR( hr, MainCleanup );  
   hr = ExecuteSQL( pIDBCreateCommand, L"IF EXISTS (SELECT name FROM master..sysdatabases WHERE name = 'DBFsa') DROP DATABASE [DBFsa]");  
   CHECK_HR_ERR(hr, MainCleanup);  
   hr = ExecuteSQL( pIDBCreateCommand, L"IF NOT EXISTS (SELECT name FROM sysdatabases WHERE name = 'DBFsa')"  
      L"CREATE DATABASE [DBFsa] ON PRIMARY (NAME=[dbf], FILENAME='c:\\DBFsa\\dbf.mdf'),"   
      L"FILEGROUP [FsGrp] CONTAINS FILESTREAM (NAME=[FsCnt], FILENAME='c:\\DBFsa\\FsCnt')"  
      L"LOG ON (NAME = [dbl], FILENAME = 'c:\\DBFsa\\dbl.ldf', SIZE = 5MB, MAXSIZE = 3000MB, FILEGROWTH = 5MB)");  
   CHECK_HR_ERR(hr, MainCleanup);  
   hr = ExecuteSQL( pIDBCreateCommand, L"IF NOT EXISTS(SELECT name FROM [DBFsa]..[sysobjects] WHERE name='FSTRTable' AND type='U') "  
      L"CREATE TABLE [DBFsa]..[FSTRTable] (uid int NOT NULL UNIQUE NONCLUSTERED, val VARBINARY(MAX) FILESTREAM, "  
      L"rowguid uniqueidentifier ROWGUIDCOL NOT NULL UNIQUE DEFAULT NEWID())");  
   CHECK_HR_ERR(hr, MainCleanup);  
  
   printf( "Creation of table+proc via ExecuteSQL(...) returned 0x%08x.\n", hr );  
   CHECK_HR_ERR(hr,MainCleanup);  
  
   // Get ICommandText.  
   hr = pIDBCreateCommand->CreateCommand( NULL, IID_ICommandText, (IUnknown**)&pICommandText );  
   printf( "pIDBCreateCommand->CreateCommand(...) returned 0x%08x.\n", hr );  
   CHECK_HR_ERR(hr,MainCleanup);  
  
   // Prepare the parameterized execute statement.  
   hr = pICommandText->SetCommandText( DBGUID_DBSQL, L"INSERT INTO [DBFsa]..[FSTRTable] VALUES (?,?,DEFAULT)" );  
  
   // Get ICommandPrepare interface and prepare statement.  
   hr = pICommandText->QueryInterface( IID_ICommandPrepare, (void**)&pICommandPrepare );  
   printf( "pICommandText->QueryInterface(IID_ICommandPrepare) returned 0x%08x.\n", hr );  
   CHECK_HR_ERR(hr,MainCleanup);  
   hr = pICommandPrepare->Prepare(0);  
  
   // Set up parameter value binding.  
   ZeroMemory( &dbBind, sizeof(dbBind) );  
  
   struct _PARAM_BLOCK {  
      long f1;  
      long f1_status;  
      long f1_length;  
      unsigned long imageData_length;  
      long imageData_status;  
      IUnknown* imageData;  
   } PARAM_BLOCK;  
  
   dbBind[0].iOrdinal= 1;  
   dbBind[0].dwPart= DBPART_VALUE | DBPART_STATUS | DBPART_LENGTH;  
   dbBind[0].eParamIO= DBPARAMIO_INPUT;  
   dbBind[0].obValue= offsetof( _PARAM_BLOCK, f1 );  
   dbBind[0].obStatus= offsetof( _PARAM_BLOCK, f1_status );  
   dbBind[0].obLength= offsetof( _PARAM_BLOCK, f1_length );  
   dbBind[0].wType= DBTYPE_I4;  
   dbBind[0].cbMaxLen= sizeof(int);  
  
   dbBind[1].iOrdinal= 2;  
   dbBind[1].dwPart= DBPART_VALUE | DBPART_STATUS;  
   dbBind[1].eParamIO= DBPARAMIO_INPUT;  
   dbBind[1].obValue= offsetof( _PARAM_BLOCK, imageData );  
   dbBind[1].obStatus= offsetof( _PARAM_BLOCK, imageData_status );  
   dbBind[1].obLength  = offsetof( _PARAM_BLOCK, imageData_length );  
   dbBind[1].dwMemOwner = DBMEMOWNER_CLIENTOWNED;  
   dbBind[1].wType= DBTYPE_IUNKNOWN;  
   dbBind[1].pObject= new DBOBJECT;  
   dbBind[1].pObject->dwFlags = STGM_READ;  
   dbBind[1].pObject->iid = IID_ISequentialStream;  
   dbBind[1].cbMaxLen= 0;  
  
   // Get an accessor for our binding.  
   hr = pICommandText->QueryInterface( IID_IAccessor, (void**)&pIAccessor );  
   printf( "pICommandText->QueryInterface( IID_IAccessor) returned 0x%08x.\n", hr );  
   CHECK_HR_ERR(hr,MainCleanup);  
  
   hr = pIAccessor->CreateAccessor( DBACCESSOR_PARAMETERDATA,  
      PARAM_COUNT,   
      &dbBind[0],   
      sizeof(PARAM_BLOCK),   
      &hAccessor,   
      NULL );  
   printf( "pIAccessor->CreateAccessor(...) returned 0x%08x.\n", hr );  
   CHECK_HR_ERR(hr,MainCleanup);  
  
   // Set the parameter values and status/length.  
   PARAM_BLOCK.f1 = 1;  
   PARAM_BLOCK.f1_status = DBSTATUS_S_OK;  
   PARAM_BLOCK.f1_length = sizeof(int);  
   PARAM_BLOCK.imageData = (IUnknown*)&issHelper1;  
   PARAM_BLOCK.imageData_status = DBSTATUS_S_OK;  
   PARAM_BLOCK.imageData_length = (long)issHelper1.m_i64ThreshHold;  
  
   issHelper1.m_dwParamOrdinal=1;  
  
   dbParams.cParamSets= 1;  
   dbParams.hAccessor= hAccessor;  
   dbParams.pData= &PARAM_BLOCK;  
  
   __int64 i64TotalBytesUploaded = issHelper1.m_i64ThreshHold;  
  
   DWORD dwStartTick = GetTickCount();  
   hr = pICommandText->Execute( NULL, IID_NULL, &dbParams, NULL, NULL );  
   CHECK_HR_ERR(hr, MainCleanup);  
   printf( "pICommandText->Execute(...) returned 0x%08x.\n", hr );  
   DWORD dwElapsed = GetTickCount()-dwStartTick;  
  
   __int64 i64Elapsed = (__int64) dwElapsed;  
   __int64 i64BytesPerSecond = i64TotalBytesUploaded*1000/i64Elapsed;  
   printf("TotalBytes=%010I64u ElapsedMS=%I64u BytesPerSecond=%010I64u\n",   
      i64TotalBytesUploaded, i64Elapsed, i64BytesPerSecond );  
  
MainCleanup:  
   SAFE_RELEASE( pIDBCreateCommand );  
   SAFE_RELEASE( pICommandText );  
   SAFE_RELEASE( pICommandPrepare );  
   SAFE_RELEASE( pIAccessor );  
}  

sp_detach_db 'DBFsa'  
IF EXISTS (SELECT name FROM master..sysdatabases WHERE name = 'DBFsa') DROP DATABASE [DBFsa]