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Visual C++

AdoCtrlAccessDlg.cpp：源码内容
							// AdoCtrlAccessDlg.cpp : implementation file
//
#include "stdafx.h"
#include "AdoCtrlAccess.h"
#include "AdoCtrlAccessDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
class CAboutDlg : public CDialog
{
public:
	CAboutDlg();
// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL
// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CAdoCtrlAccessDlg dialog
CAdoCtrlAccessDlg::CAdoCtrlAccessDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CAdoCtrlAccessDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CAdoCtrlAccessDlg)
	m_nID = 0;
	m_strName = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CAdoCtrlAccessDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAdoCtrlAccessDlg)
	DDX_Text(pDX, IDC_ID, m_nID);
	DDX_Text(pDX, IDC_NAME, m_strName);
	//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CAdoCtrlAccessDlg, CDialog)
	//{{AFX_MSG_MAP(CAdoCtrlAccessDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_PRV, OnPrv)
	ON_BN_CLICKED(IDC_NEXT, OnNext)
	ON_BN_CLICKED(IDC_MODIFY, OnModify)
	ON_WM_DESTROY()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CAdoCtrlAccessDlg message handlers
BOOL CAdoCtrlAccessDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	// Add "About..." menu item to system menu.
	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);
	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}
	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	//初始化环境
	::CoInitialize(NULL);
	//创建并打开数据库连接对象
	_variant_t vFieldValue;
	CString strFieldValue;
	m_pCon.CreateInstance(__uuidof(Connection));
	m_pCon->Open("students","","",NULL);
	//创建并打开记录集对象
	m_pRs.CreateInstance(__uuidof(Recordset));
	m_pRs->Open("select* from table1",m_pCon.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
	if(VARIANT_FALSE == m_pRs->EndOfFile)
    {
		//获得第一条记录并显示
		vFieldValue = m_pRs->GetCollect("id");
		strFieldValue = (char*)_bstr_t(vFieldValue);
		m_nID = atoi(strFieldValue.GetBuffer(0));;
		vFieldValue.Clear();
		vFieldValue = m_pRs->GetCollect("name");
		strFieldValue = (char*)_bstr_t(vFieldValue);
		m_strName = strFieldValue;
		vFieldValue.Clear();
    }
	UpdateData(FALSE);
	return TRUE;  // return TRUE  unless you set the focus to a control
}
void CAdoCtrlAccessDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}
// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.
void CAdoCtrlAccessDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting
		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;
		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}
// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CAdoCtrlAccessDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}
//前一条记录
void CAdoCtrlAccessDlg::OnPrv() 
{
	_variant_t vFieldValue;
	CString strFieldValue;
	//记录集指针前移一条
	m_pRs->MovePrevious();
	if(VARIANT_FALSE == m_pRs->FirstOfFile)
    {
		//获得当前条的数据并显示
		vFieldValue = m_pRs->GetCollect("id");
		strFieldValue = (char*)_bstr_t(vFieldValue);
		m_nID = atoi(strFieldValue.GetBuffer(0));;
		vFieldValue.Clear();
		vFieldValue = m_pRs->GetCollect("name");
		strFieldValue = (char*)_bstr_t(vFieldValue);
		m_strName = strFieldValue;
		vFieldValue.Clear();
		UpdateData(FALSE);
    }
	else
	{
		//定位到第一条
		m_pRs->MoveNext();
		AfxMessageBox("已经到第一条了");
	}
}
//后一条记录
void CAdoCtrlAccessDlg::OnNext() 
{
	_variant_t vFieldValue;
	CString strFieldValue;
	//记录集指针后移一条
	m_pRs->MoveNext();
	if(VARIANT_FALSE == m_pRs->EndOfFile)
    {
		//获得当前条的数据并显示
		vFieldValue = m_pRs->GetCollect("id");
		strFieldValue = (char*)_bstr_t(vFieldValue);
		m_nID = atoi(strFieldValue.GetBuffer(0));;
		vFieldValue.Clear();
		vFieldValue = m_pRs->GetCollect("name");
		strFieldValue = (char*)_bstr_t(vFieldValue);
		m_strName = strFieldValue;
		vFieldValue.Clear();
		UpdateData(FALSE);
    }
	else
	{
		//定位到最后一条
		m_pRs->MovePrevious();
		AfxMessageBox("已经到最后一条了");
	}
}
//修改记录
void CAdoCtrlAccessDlg::OnModify() 
{
	UpdateData(TRUE);
	if(VARIANT_FALSE == m_pRs->EndOfFile)
	{
		//修改数据库记录
		_variant_t vFieldName,vFieldValue;
		CString strValue;
		vFieldName.SetString("id");
		strValue.Format("%d",m_nID);
		vFieldValue.SetString(strValue);
		m_pRs->Update(vFieldName,vFieldValue);
		vFieldName.Clear();
		vFieldValue.Clear();
		vFieldName.SetString("name");
		vFieldValue.SetString(m_strName);
		m_pRs->Update(vFieldName,vFieldValue);
		vFieldName.Clear();
		vFieldValue.Clear();
	}
}
void CAdoCtrlAccessDlg::OnDestroy() 
{
	//关闭记录和连接
	m_pRs->Close();
	m_pCon->Close();
	//释放环境
	::CoUninitialize();
	CDialog::OnDestroy();
}

						