Enviar dados para uma coluna FILESTREAM usando IRowsetFastUpload (OLE DB)

Artigo
05/07/2013
Este exemplo usa a interface IRowsetFastUpload para enviar entre 4 MB e 4 GB de dados a uma coluna 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-a em um arquivo denominado ISSHelper.cpp.
Copie a terceira listagem de código e cole-a em um arquivo denominado IRowsetFastLoadUpload.cpp.
Compile IRowsetFastLoadUpload.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:
   // Constructor/destructor.
   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

#define WIN32_LEAN_AND_MEAN// Exclude rarely-used stuff from Windows headers
#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 <tchar.h>

// TODO: reference additional headers your program requires here
#define _SQLNCLI_OLEDB_ 1
#include <sqlncli.h>

#include "ISSHelper.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUm_NEW
#endif

// 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 ) > 0 ? i64Elapsed : 1;
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;
    }

    if (pcbRead)
       *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;
}

//  IRowsetFastLoadUpload.cpp
#pragma once

#define WIN32_LEAN_AND_MEAN// Exclude rarely-used stuff from Windows headers
#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 <tchar.h>

#define _SQLNCLI_OLEDB_ 1
#include <sqlncli.h>

#include "ISSHelper.h"
#include <assert.h>

#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; } }

// 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 ( hr != S_OK ) {
      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;
}

// to open a session

// 1) create a properties object
// 2) set properties on it (such as INIT_DATASOURCE, etc.)
// 3) queryinterface an IDBInitialize on the properties object
// 4) call IDBInitialize::Initialize
// 5) queryinterface an IDBCreateSession on the IDBInitialize instance
// 6) call IDBCreateSession::CreateSession with interface to use on the session (IDBCreateCommand, IOpenRowset, IBCPSession, etc.)

HRESULT OpenSession( wchar_t* datasource, wchar_t* catalog, const IID& iid, void** out ) {
#define SET_BSTR_PROP(index, proparray, propid, value) \
   { proparray[index].dwOptions = DBPROPOPTIONS_REQUIRED; \
   proparray[index].colid = DB_NULLID; \
   proparray[index].dwStatus = DBPROPSTATUS_OK; \
   proparray[index].dwPropertyID = propid; \
   proparray[index].vValue.vt = VT_BSTR; \
   proparray[index].vValue.bstrVal = SysAllocString(value); }

#define SET_BOOL_PROP(index, proparray, propid, value) \
   { proparray[index].dwOptions = DBPROPOPTIONS_REQUIRED; \
   proparray[index].colid = DB_NULLID; \
   proparray[index].dwStatus = DBPROPSTATUS_OK; \
   proparray[index].dwPropertyID = propid; \
   proparray[index].vValue.vt = VT_BOOL; \
   proparray[index].vValue.boolVal = (value) ? VARIANT_TRUE : VARIANT_FALSE; }

   HRESULT hr;

   static IDBProperties*    pIDBProperties = NULL;
   IDBProperties*pIDBSessionProperties = NULL;
   IDBInitialize*pIDBInitialize = NULL;  
   static IDBCreateSession*pIDBCreateSession = NULL;

   DBPROPInitProperties[3];
   DBPROP       BulkCopyProperties[2];
   DBPROPSETPropSet[2];

   hr = CoCreateInstance( SQLNCLI_CLSID, NULL, CLSCTX_INPROC_SERVER, IID_IDBProperties, 
      (void **) &pIDBProperties );    
   CHECK_HR_ERR(hr,OpenSessionCleanup);

   // Hard coded this to point to local sql server, change as needed.
   SET_BSTR_PROP( 0, InitProperties, DBPROP_INIT_DATASOURCE, datasource );
   SET_BSTR_PROP( 1, InitProperties, DBPROP_INIT_CATALOG, catalog );
   SET_BSTR_PROP( 2, InitProperties, DBPROP_AUTH_INTEGRATED, L"SSPI" );

   SET_BOOL_PROP( 0, BulkCopyProperties, SSPROP_ENABLEFASTLOAD, true );
   SET_BOOL_PROP( 1, BulkCopyProperties, SSPROP_ENABLEBULKCOPY, true );

   PropSet[0].guidPropertySet = DBPROPSET_DBINIT; 
   PropSet[0].cProperties = 3;               
   PropSet[0].rgProperties = InitProperties; 

   PropSet[1].guidPropertySet = DBPROPSET_SQLSERVERDATASOURCE;
   PropSet[1].cProperties = 2;
   PropSet[1].rgProperties = BulkCopyProperties;

   pIDBProperties->SetProperties( 1, (DBPROPSET*) &PropSet );
   CHECK_HR_ERR( hr, OpenSessionCleanup );

   hr = pIDBProperties->QueryInterface( IID_IDBInitialize, (void**) &pIDBInitialize );
   CHECK_HR_ERR( hr,OpenSessionCleanup );

   hr = pIDBInitialize->Initialize();
   CHECK_HR_ERR( hr,OpenSessionCleanup );

   // QI for IID_IDBCreateSession and then create session.
   hr = pIDBInitialize->QueryInterface( IID_IDBCreateSession, (void**) &pIDBCreateSession );
   CHECK_HR_ERR( hr,OpenSessionCleanup );

   pIDBCreateSession->QueryInterface( IID_IDBProperties, (void**) &pIDBSessionProperties );
   pIDBSessionProperties->SetProperties( 1, &PropSet[1] );

   assert( pIDBCreateSession != NULL );
   hr = pIDBCreateSession->CreateSession( NULL, iid, (IUnknown**) out );

OpenSessionCleanup:
   SAFE_RELEASE( pIDBProperties );
   SAFE_RELEASE( pIDBInitialize );
   SAFE_RELEASE( pIDBCreateSession );
   SAFE_RELEASE( pIDBSessionProperties );

   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_ERR(hr,ExecuteSQLCleanup);
   hr = pICommandText->SetCommandText( DBGUID_DBSQL, pwszCommand );
   CHECK_HR_ERR(hr,ExecuteSQLCleanup);
   hr = pICommandText->Execute( NULL, IID_NULL, NULL, NULL, NULL );

ExecuteSQLCleanup:
   SAFE_RELEASE(pICommandText);
   return hr;
}

void wmain(int argc, wchar_t* argv[]) {
   HRESULT hr;
   IOpenRowset * pIOpenRowset = NULL;
   IRowsetFastLoad * pIRowsetFastLoad = NULL;
   IDBCreateCommand * pIDBCreateCommand = NULL;
   IAccessor * pIAccessor = NULL;

   HACCESSOR hAccessor;
   DBBINDING dbBind[ 2 ];
   DBBINDSTATUS dbBindStatus[ 2 ];

   if ( argc < 3 ) {
      wprintf( L"Usage: IRowsetFastLoadUpload <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 for the command
   hr = OpenSession( argv[1], L"master", IID_IDBCreateCommand, (void**) &pIDBCreateCommand );
   CHECK_HR_ERR(hr,MainCleanup);

   // Enable filestream ,drop and re-create test table and procedure.
   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 );

   // Open connection to SS database for the IOpenRowset
   hr = OpenSession( argv[1], L"master", IID_IOpenRowset, (void**) &pIOpenRowset );
   CHECK_HR_ERR(hr,MainCleanup);

   DBID table;
   table.eKind = DBKIND_NAME;
   table.uName.pwszName = L"[DBFsa]..[FSTRTable]";

   hr = pIOpenRowset->OpenRowset( NULL, &table, NULL, IID_IRowsetFastLoad, 0, NULL, (IUnknown**) &pIRowsetFastLoad );
   CHECK_HR_ERR(hr,MainCleanup);

   // 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_NOTPARAM;
   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_NOTPARAM;
   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 = pIRowsetFastLoad->QueryInterface( IID_IAccessor, (void**)&pIAccessor );
   CHECK_HR_ERR(hr,MainCleanup);

   hr = pIAccessor->CreateAccessor( DBACCESSOR_ROWDATA,
      2,
      &dbBind[0], 
      sizeof(PARAM_BLOCK), 
      &hAccessor, 
      dbBindStatus );
   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;

   hr = pIRowsetFastLoad->InsertRow( hAccessor, &PARAM_BLOCK );
   CHECK_HR_ERR( hr, MainCleanup );

   hr = pIRowsetFastLoad->Commit( TRUE );
   CHECK_HR_ERR( hr, MainCleanup );

MainCleanup:
   SAFE_RELEASE( pIRowsetFastLoad );
   SAFE_RELEASE( pIOpenRowset );
   SAFE_RELEASE( pIDBCreateCommand );
   SAFE_RELEASE( pIAccessor );

   printf_s( "Test complete.\n" );
}

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

Enviar dados para uma coluna FILESTREAM usando IRowsetFastUpload (OLE DB)

Exemplo

Recursos adicionais
