使用 IBCPSession 将 FILESTREAM 列读入文件 (OLE DB)
此示例使用 IBCPSession 接口将 filestream 列读入文件并编写格式化文件。
有关文件流功能的详细信息，请参阅 FILESTREAM 支持 (OLE DB)。
示例
请确保您的 INCLUDE 环境变量包括含有 sqlncli.h 的目录。
使用以下示例之一创建此示例读取的表：
复制第一个代码列表，并将其粘贴到名为 ISSHelper.h 的文件中。
复制第二个代码列表，并将其粘贴到名为 ISSHelper.cpp 的文件中。
复制第三个代码列表，并将其粘贴到名为 IBCPSession.cpp 的文件中。
编译 IBCPSession.cpp、ISSHelper.cpp、ole32.lib 和 oleaut32.lib。
运行该示例时，必须传递一个服务器名称（或 server\instance_name）以及一个将创建的格式化文件的名称。
// 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 <stdio.h>
#include <conio.h>
#include <tchar.h>
#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;
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;
// __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;
}
// IBCPSession.cpp
#pragma once
#define WIN32_LEAN_AND_MEAN// Exclude rarely-used stuff from Windows headers
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
#include <sqlncli.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 ( 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;
}
// 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;
IDBProperties* pIDBProperties = NULL;
IDBProperties* pIDBSessionProperties = NULL;
IDBInitialize* pIDBInitialize = NULL;
IDBCreateSession* pIDBCreateSession = NULL;
DBPROP InitProperties[3];
DBPROP BulkCopyProperties[2];
DBPROPSET PropSet[2];
hr = CoCreateInstance( SQLNCLI_CLSID, NULL, CLSCTX_INPROC_SERVER, IID_IDBProperties,
(void **) &pIDBProperties );
CHECK_HR(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( hr, OpenSessionCleanup );
hr = pIDBProperties->QueryInterface( IID_IDBInitialize, (void**) &pIDBInitialize );
CHECK_HR( hr,OpenSessionCleanup );
hr = pIDBInitialize->Initialize();
CHECK_HR( hr,OpenSessionCleanup );
// QI for IID_IDBCreateSession and then create session.
hr = pIDBInitialize->QueryInterface( IID_IDBCreateSession, (void**) &pIDBCreateSession );
CHECK_HR( hr,OpenSessionCleanup );
pIDBCreateSession->QueryInterface( IID_IDBProperties, (void**) &pIDBSessionProperties );
pIDBSessionProperties->SetProperties( 1, &PropSet[1] );
hr = pIDBCreateSession->CreateSession( NULL, iid, (IUnknown**) out );
OpenSessionCleanup:
SAFE_RELEASE( pIDBProperties );
SAFE_RELEASE( pIDBInitialize );
SAFE_RELEASE( pIDBCreateSession );
SAFE_RELEASE( pIDBSessionProperties );
return hr;
}
int wmain(int argc, wchar_t* argv[]) {
HRESULT hr;
IBCPSession * pIBCPSession = NULL;
DBROWCOUNT rows;
CoInitialize(NULL);
if ( argc < 2 ) {
printf( "Usage: IBCPSession <server> <file> [<error file>]\n");
return 0;
}
// Open connection to database.
hr = OpenSession( argv[1], L"master", IID_IBCPSession, (void**) &pIBCPSession );
CHECK_HR_ERR(hr,MainCleanup);
// change the last parameter to BCP_DIRECTION_IN to make it write a file into the server
hr = pIBCPSession->BCPInit( L"[DBFsa]..[FSTRTable]", argv[2], (argc > 3) ? argv[3] : NULL, BCP_DIRECTION_OUT );
CHECK_HR_ERR( hr, MainCleanup );
#define WRITE_FMT_FILE 1
#if WRITE_FMT_FILE
hr = pIBCPSession->BCPColumns( 3 );
CHECK_HR_ERR( hr, MainCleanup );
hr = pIBCPSession->BCPColFmt( 1, BCP_TYPE_DEFAULT, BCP_PREFIX_DEFAULT, BCP_LENGTH_VARIABLE, NULL, 0, 1 );
CHECK_HR_ERR( hr, MainCleanup );
hr = pIBCPSession->BCPColFmt( 2, BCP_TYPE_DEFAULT, BCP_PREFIX_DEFAULT, BCP_LENGTH_VARIABLE, NULL, 0, 2 );
CHECK_HR_ERR( hr, MainCleanup );
hr = pIBCPSession->BCPColFmt( 3, BCP_TYPE_DEFAULT, BCP_PREFIX_DEFAULT, BCP_LENGTH_VARIABLE, NULL, 0, 3 );
CHECK_HR_ERR( hr, MainCleanup );
hr = pIBCPSession->BCPWriteFmt( L"fstrtable.fmt" );
CHECK_HR_ERR( hr, MainCleanup );
#else
hr = pIBCPSession->BCPReadFmt( L"fstrtable.fmt" );
CHECK_HR_ERR( hr, MainCleanup );
#endif
hr = pIBCPSession->BCPExec( &rows );
CHECK_HR_ERR( hr, MainCleanup );
hr = pIBCPSession->BCPDone();
CHECK_HR_ERR( hr, MainCleanup );
MainCleanup:
SAFE_RELEASE( pIBCPSession );
printf_s( "Test complete.\n" );
}