oledbdepartmentmfcview.cpp

来自「vc++6.0数据库编程大全一书得各个章节得源码,比较详细.可以仔细参照学习!」· C++ 代码 · 共 155 行

// OLEDBDepartmentMFCView.cpp : implementation of the COLEDBDepartmentMFCView class
//

#include "stdafx.h"
#include "OLEDBDepartmentMFC.h"

#include "OLEDBDepartmentMFCSet.h"
#include "OLEDBDepartmentMFCDoc.h"
#include "OLEDBDepartmentMFCView.h"

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

//Added by Chuck Wood for error checking
#include "..\OLEDBErrorChecking\OLEDBErrorChecking.h"

/////////////////////////////////////////////////////////////////////////////
// COLEDBDepartmentMFCView

IMPLEMENT_DYNCREATE(COLEDBDepartmentMFCView, COleDBRecordView)

BEGIN_MESSAGE_MAP(COLEDBDepartmentMFCView, COleDBRecordView)
	//{{AFX_MSG_MAP(COLEDBDepartmentMFCView)
	ON_EN_CHANGE(IDC_DEPARTMENTCODE, OnChangeDepartmentcode)
	ON_EN_CHANGE(IDC_DEPARTMENTNAME, OnChangeDepartmentname)
	ON_COMMAND(ID_FILE_SAVE, OnFileSave)
	ON_WM_DESTROY()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// COLEDBDepartmentMFCView construction/destruction

COLEDBDepartmentMFCView::COLEDBDepartmentMFCView()
	: COleDBRecordView(COLEDBDepartmentMFCView::IDD)
{
	//{{AFX_DATA_INIT(COLEDBDepartmentMFCView)
		// NOTE: the ClassWizard will add member initialization here
	m_pSet = NULL;
	//}}AFX_DATA_INIT
	m_bChangesMade = FALSE;
}

COLEDBDepartmentMFCView::~COLEDBDepartmentMFCView()
{
}

void COLEDBDepartmentMFCView::DoDataExchange(CDataExchange* pDX)
{
	COleDBRecordView::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(COLEDBDepartmentMFCView)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
	//Added by Chuck Wood for the data exchange
    DDX_Text(pDX, IDC_DEPARTMENTCODE, m_pSet->m_DepartmentCode, 5);
    DDV_MaxChars(pDX, m_pSet->m_DepartmentCode, 4);
    DDX_Text(pDX, IDC_DEPARTMENTNAME, m_pSet->m_DepartmentName, 51);
    DDV_MaxChars(pDX, m_pSet->m_DepartmentName, 50);
}

BOOL COLEDBDepartmentMFCView::PreCreateWindow(CREATESTRUCT& cs)
{
	return COleDBRecordView::PreCreateWindow(cs);
}

void COLEDBDepartmentMFCView::OnInitialUpdate()
{
	m_pSet = &GetDocument()->m_oLEDBDepartmentMFCSet;
	{
		CWaitCursor wait;
		HRESULT hr = m_pSet->Open();
		if (hr != S_OK)
		{
			AfxMessageBox(_T("Record set failed to open."), MB_OK);
			m_bOnFirstRecord = TRUE;
			m_bOnLastRecord = TRUE;
		}				
	}
	COleDBRecordView::OnInitialUpdate();

}

/////////////////////////////////////////////////////////////////////////////
// COLEDBDepartmentMFCView diagnostics

#ifdef _DEBUG
void COLEDBDepartmentMFCView::AssertValid() const
{
	COleDBRecordView::AssertValid();
}

void COLEDBDepartmentMFCView::Dump(CDumpContext& dc) const
{
	COleDBRecordView::Dump(dc);
}

COLEDBDepartmentMFCDoc* COLEDBDepartmentMFCView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(COLEDBDepartmentMFCDoc)));
	return (COLEDBDepartmentMFCDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// COLEDBDepartmentMFCView database support
CRowset* COLEDBDepartmentMFCView::OnGetRowset()
{
	return m_pSet;
}


/////////////////////////////////////////////////////////////////////////////
// COLEDBDepartmentMFCView message handlers

void COLEDBDepartmentMFCView::OnDestroy() 
{
    if (m_bChangesMade) {
        //Yes was chosen. Save out record
        if (AfxMessageBox(
            "Do you want to save changes to the database?",
            MB_YESNO) == IDYES) {
		    UpdateData(TRUE);
			m_pSet->SetData();
            OnFileSave();
        }
    }
	COleDBRecordView::OnDestroy();
}

void COLEDBDepartmentMFCView::OnFileSave() 
{
    if (m_bChangesMade) {
        m_bChangesMade = FALSE;
		HRESULT hr = m_pSet->Update();
		if (!SUCCEEDED(hr)) {
			COLEDBErrorChecking::DisplaySingleError(hr, "Update in the OnFileSave");
		}
    }
}

void COLEDBDepartmentMFCView::OnChangeDepartmentcode() 
{
    m_bChangesMade = TRUE;	
}

void COLEDBDepartmentMFCView::OnChangeDepartmentname() 
{
    m_bChangesMade = TRUE;	
}