添加二进制文件到数据库示例

添加二进制文件到数据库示例

第一步：读取文件到类成员变量m_pFileBuffer
BOOL CDLGAddModel::Load3DDataFile(CString fileName)
{
CFile file;
if( !file.Open( fileName, CFile::modeRead) )
return FALSE;
m_fileLen = file.GetLength();
HGLOBAL hMem = ::GlobalAlloc( GMEM_MOVEABLE, m_fileLen );
LPVOID lpBuf = ::GlobalLock( hMem );
if( file.Read( lpBuf, m_fileLen ) != m_fileLen )
return FALSE;
file.Close();
m_pFileBuffer = (char *)lpBuf;
::GlobalUnlock( hMem );
return TRUE;
}

第二步：向数据库写入数据
……
_RecordsetPtr pRecordset;
pRecordset.CreateInstance(__uuidof(Recordset));
pRecordset->Open("SELECT * FROM model",_variant_t((IDispatch*)DBM.p_Con),adOpenStatic,adLockOptimistic,adCmdText);
pRecordset->AddNew();
Load3DDataFile(fileName);
VARIANT pvList;
SetDataToVariant(pvList,(unsigned char *)m_pFileBuffer);
pRecordset->Fields->Item["data"]->AppendChunk(pvList);
pRecordset->Update();
pRecordset->Close();
……