readmdbdlg.cpp

利用ADO类连接数据库

// ReadMDBDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ReadMDB.h"
#include "ReadMDBDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CReadMDBDlg dialog

CReadMDBDlg::CReadMDBDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CReadMDBDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CReadMDBDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CReadMDBDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CReadMDBDlg)
	DDX_Control(pDX, IDC_LISTSTUDENTREC, m_ListStudentRec);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CReadMDBDlg, CDialog)
	//{{AFX_MSG_MAP(CReadMDBDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTONCONNECTDB, OnButtonconnectdb)
	ON_BN_CLICKED(IDC_BUTTONDISPLAYREC, OnButtondisplayrec)
	ON_WM_CLOSE()
	ON_BN_CLICKED(IDC_BUTTONEXIT, OnButtonexit)
	ON_BN_CLICKED(IDC_BUTTONDELETEREC, OnButtondeleterec)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CReadMDBDlg message handlers

BOOL CReadMDBDlg::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
	//set extended style for student record list
	m_ListStudentRec.SetExtendedStyle(LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES);
	//initialize student record list
	m_ListStudentRec.InsertColumn(1,"姓名",LVCFMT_CENTER,100,-1);
	m_ListStudentRec.InsertColumn(2,"性别",LVCFMT_CENTER,100,-1);
	m_ListStudentRec.InsertColumn(3,"年龄",LVCFMT_CENTER,100,-1);
	m_ListStudentRec.InsertColumn(4,"学号",LVCFMT_CENTER,100,-1);

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CReadMDBDlg::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 CReadMDBDlg::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 CReadMDBDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CReadMDBDlg::OnButtonconnectdb() 
{
	// TODO: Add your control notification handler code here
	m_DaoDatabase.Open("student.mdb");
	GetDlgItem(IDC_BUTTONCONNECTDB)->EnableWindow(FALSE);
	GetDlgItem(IDC_BUTTONDISPLAYREC)->EnableWindow(TRUE);
}

void CReadMDBDlg::OnButtondisplayrec() 
{
	// TODO: Add your control notification handler code here
	CDaoRecordset DaoRecordset(&m_DaoDatabase);
	int ItemIndex=0;
	COleVariant OleVariant;
	CString name,sex,age,number;

	//open dataset
	DaoRecordset.Open(AFX_DAO_USE_DEFAULT_TYPE,"select * from tb_student");
	//clear student record list
	m_ListStudentRec.DeleteAllItems();

	DaoRecordset.MoveFirst();
	while (!DaoRecordset.IsEOF())
	{
		//fetch record data
		DaoRecordset.GetFieldValue("name",OleVariant);
		name=CString(OleVariant.pbVal);
		DaoRecordset.GetFieldValue("sex",OleVariant);
		sex=CString(OleVariant.pbVal);
		DaoRecordset.GetFieldValue("age",OleVariant);
		age.Format("%d",OleVariant.lVal);
		DaoRecordset.GetFieldValue("number",OleVariant);
		number.Format("%d",OleVariant.lVal);
		//display current record
		m_ListStudentRec.InsertItem(ItemIndex,"");
		m_ListStudentRec.SetItemText(ItemIndex,0,name);
		m_ListStudentRec.SetItemText(ItemIndex,1,sex);
		m_ListStudentRec.SetItemText(ItemIndex,2,age);
		m_ListStudentRec.SetItemText(ItemIndex,3,number);
		ItemIndex++;
		//move to next record
		DaoRecordset.MoveNext();
	}
	//close recordset
	DaoRecordset.Close();

	//enable delete record button
	GetDlgItem(IDC_BUTTONDELETEREC)->EnableWindow(TRUE);
}

void CReadMDBDlg::OnClose() 
{
	// TODO: Add your message handler code here and/or call default
	if (m_DaoDatabase.IsOpen())
		m_DaoDatabase.Close();
	CDialog::OnClose();
}

void CReadMDBDlg::OnButtonexit() 
{
	// TODO: Add your control notification handler code here
	SendMessage(WM_CLOSE);
}

void CReadMDBDlg::OnButtondeleterec() 
{
	// TODO: Add your control notification handler code here
	CString sqlstr("delete from tb_student where "),name,sex,age,number;
	int SelMark;

	SelMark=m_ListStudentRec.GetSelectionMark();
	if (SelMark<0)
		return;

	//get current selected record	
	name=m_ListStudentRec.GetItemText(SelMark,0);
	sex=m_ListStudentRec.GetItemText(SelMark,1);
	age=m_ListStudentRec.GetItemText(SelMark,2);
	number=m_ListStudentRec.GetItemText(SelMark,3);

	//construct sql sentense
	sqlstr+=CString("name like '")+name+CString("' and sex like '")+sex+CString("' and age=")+age+CString(" and number=")+number;
	
	//delete record from database
	m_DaoDatabase.Execute(sqlstr);

	//delete selected item from list control
	m_ListStudentRec.DeleteItem(SelMark);
}