Partilhar via


Enviar dados para uma coluna FILESTREAM por meio de ISequentialStream associado ao parâmetro ICommandText (OLE DB)

Este exemplo usa uma interface de ISequentialStream associada a um parâmetro de ICommandText para enviar de 4 MB a 4 GB de dados a uma coluna de filestream.

Para obter mais informações sobre o recurso filestream, consulte Suporte a FILESTREAM (OLE DB).

Exemplo

Antes de compilar e executar este exemplo, habilite o suporte ao FILESTREAM (Habilitar e configurar FILESTREAM).

Verifique se a variável de ambiente INCLUDE inclui o diretório que contém sqlncli.h.

O servidor deve ter o diretório C:\DBFsa; é onde o exemplo criará o banco de dados. Sua instância do SQL Server deve ter acesso de gravação neste local (por exemplo, faça logon como uma conta de sistema local).

Copie a primeira listagem de código e cole-a em um arquivo denominado ISSHelper.h.

Copie a segunda listagem de código e cole em um arquivo denominado ISSHelper.cpp.

Copie a terceira listagem de código e cole em um arquivo denominado ICommandUpload.cpp.

Compile ICommandUpload.cpp, ISSHelper.cpp, ole32.lib e oleaut32.lib.

Ao executar este exemplo, você precisará passar o nome de um servidor ou de um servidor\nome_da_instância, bem como um valor entre 4 MB (0x400001) e 4 GB (0xFFFFFFFF) que indique a quantidade de dados a ser gravada.

A quarta listagem de código (Transact-SQL) exclui o banco de dados criado por este exemplo.

// 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 bufffer 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 <sqloledb.h>   // SS Provider.
#include <sqlncli.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 SQLOLEDB.
   hr = CoCreateInstance( SQLNCLI_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]