imageset.cpp

这是书上的代码

// ImageSet.cpp : implementation file
//

#include "stdafx.h"
#include "LOBTest.h"
#include "ImageSet.h"

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


/////////////////////////////////////////////////////////////////////////////
// CImageSet

IMPLEMENT_DYNAMIC(CImageSet, CRecordset)

CImageSet::CImageSet(CDatabase* pdb)
	: CRecordset(pdb)
{
	//{{AFX_FIELD_INIT(CImageSet)
	m_BLOBLength = 0;
	m_BLOBName = _T("");
	m_nFields = 3;
	//}}AFX_FIELD_INIT
	m_nDefaultType = snapshot;

	SetDBType(((CLOBTestApp*)AfxGetApp())->m_nDBType);
//	m_nDBSourceType = 1;

}


CString CImageSet::GetDefaultConnect()
{
	switch( m_nDBSourceType )
	{
	case 1: //Access
		return _T("ODBC;DSN=MS Access Database"); //for access
	case 2: //SQL Server
		//return _T("ODBC;DSN=pub");
		return _T("ODBC;DRIVER={SQL Server};");//SERVER=WY;Database=pubs;UID=sa;PWD=sa");
	default:
		break; 
	}
	return "";
}

CString CImageSet::GetDefaultSQL()
{
	switch( m_nDBSourceType )
	{
	case 1: //Access
		return _T("[Images]"); 
	case 2: //SQL Server
		return _T("[dbo].[Images]");
	default:
		break;
	}
}

void CImageSet::DoFieldExchange(CFieldExchange* pFX)
{
	//{{AFX_FIELD_MAP(CImageSet)
	pFX->SetFieldType(CFieldExchange::outputColumn);
	RFX_LongBinary(pFX, _T("[BLOBImage]"), m_BLOBImage);
	RFX_Long(pFX, _T("[BLOBLength]"), m_BLOBLength);
	RFX_Text(pFX, _T("[BLOBName]"), m_BLOBName);
	//}}AFX_FIELD_MAP
}

/////////////////////////////////////////////////////////////////////////////
// CImageSet diagnostics

#ifdef _DEBUG
void CImageSet::AssertValid() const
{
	CRecordset::AssertValid();
}

void CImageSet::Dump(CDumpContext& dc) const
{
	CRecordset::Dump(dc);
}
#endif //_DEBUG