数据库dlg.cpp

我第一次学数据库的源码

// 数据库Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "数据库.h"
#include "数据库Dlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
CDaoDatabase db;
CDaoRecordset RecSet(&db);

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()

/////////////////////////////////////////////////////////////////////////////
// CMyDlg dialog

CMyDlg::CMyDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMyDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMyDlg)
	m_Name = _T("");
	m_Age = _T("");
	m_Number = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMyDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMyDlg)
	DDX_Control(pDX, IDC_LIST1, m_List);
	DDX_Text(pDX, IDC_EDIT1, m_Name);
	DDX_Text(pDX, IDC_EDIT2, m_Age);
	DDX_Text(pDX, IDC_EDIT3, m_Number);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
	//{{AFX_MSG_MAP(CMyDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTN_PRE, OnBtnPre)
	ON_BN_CLICKED(IDC_BTN_NEXT, OnBtnNext)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyDlg message handlers

BOOL CMyDlg::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
	//链接数据库
	::GetCurrentDirectory(MAX_PATH,m_Path);
	this->ConnectDAO();
	
	ListView_SetExtendedListViewStyle( m_List.m_hWnd, 
		LVS_EX_FULLROWSELECT|LVS_EX_ONECLICKACTIVATE|LVS_EX_UNDERLINEHOT );
	m_List.InsertColumn(0, "姓名");
	m_List.SetColumnWidth(0, 150);
	m_List.InsertColumn(1, "年龄");
	m_List.SetColumnWidth(1, 150);
	m_List.InsertColumn(2, "学号");
	m_List.SetColumnWidth(2,150);
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CMyDlg::ConnectDAO()
{
	CString db_file=m_Path;
	db_file+="\\temp.mdb";
	CFileFind fd;
	BOOL success=fd.FindFile(db_file);
	fd.Close();
	if(!success)
	{
		db.Create(db_file);
		CString sqlcmd="create table DemoTable(Name VARCHAR(20),Age VARCHAR(3),Num VARCHAR(20));";
		db.Execute(sqlcmd);		//用SQL语句加入一个记录
		db.Execute("insert into DemoTable (Name,Age,Num) values ('李伟然','22','2003314118')");
		db.Close();
	}	
}

BOOL CMyDlg::DestroyWindow() 
{
	// TODO: Add your specialized code here and/or call the base class
	//db.Close();
	return CDialog::DestroyWindow();
}

void CMyDlg::OnBtnPre() //
{
	// TODO: Add your control notification handler code here
	this->UpdateData(TRUE);
	if(m_Name.IsEmpty())
	{
		AfxMessageBox("姓名不能为空!");
		return;
	}
	if(m_Age.IsEmpty())
	{
		AfxMessageBox("年龄不能为空!");
		return;
	}
	if(m_Number.IsEmpty())
	{
		AfxMessageBox("学号不能为空!");
		return;
	}

	CString db_file=m_Path;
	db_file+="\\temp.mdb";
	db.Open(db_file);	// 打开已创建的demo数据库及DamoTable表
	RecSet.Open(AFX_DAO_USE_DEFAULT_TYPE,"select * from DemoTable",NULL);
	RecSet.AddNew();	//用DAO函数加入一个记录
	RecSet.SetFieldValue("Name",m_Name.GetBuffer(0));
	RecSet.SetFieldValue("Age",m_Age.GetBuffer(0));
	RecSet.SetFieldValue("Num",m_Number.GetBuffer(0));
	RecSet.Update();
	RecSet.Close();
	db.Close();
}

void CMyDlg::OnBtnNext() 
{
	// TODO: Add your control notification handler code here
	COleVariant var;		// 字段类型
	var.ChangeType(VT_BSTR,NULL);
	CString db_file=m_Path;
	db_file+="\\temp.mdb";
	db.Open(db_file);		// 打开已创建的demo数据库及DamoTable表
	RecSet.Open(AFX_DAO_USE_DEFAULT_TYPE,"select * from DemoTable",NULL);
	while(!RecSet.IsEOF())	// 有没有到表结尾
	{
		RecSet.GetFieldValue("Name",var);
		m_Name=(LPCSTR)var.pbstrVal;
		RecSet.GetFieldValue("Age",var);
		m_Age=(LPCSTR)var.pbstrVal;
		RecSet.GetFieldValue("Num",var);
		m_Number=(LPCSTR)var.pbstrVal;
		RecSet.MoveNext();
	}
	RecSet.Close();		//关闭记录集
	this->UpdateData(FALSE);
	db.Close();
}

void CMyDlg::OnOK() 
{
	// TODO: Add extra validation here
	//CDialog::OnOK();
	int nItem;
	COleVariant var;		// 字段类型
	var.ChangeType(VT_BSTR,NULL);
	CString db_file=m_Path;
	db_file+="\\temp.mdb";
	db.Open(db_file);		// 打开已创建的demo数据库及DamoTable表
	RecSet.Open(AFX_DAO_USE_DEFAULT_TYPE,"select * from DemoTable",NULL);
	while(!RecSet.IsEOF())	// 有没有到表结尾
	{
		nItem = m_List.InsertItem( m_List.GetItemCount()+1,"");
		RecSet.GetFieldValue("Name",var);
		m_Name=(LPCSTR)var.pbstrVal;
		RecSet.GetFieldValue("Age",var);
		m_Age=(LPCSTR)var.pbstrVal;
		RecSet.GetFieldValue("Num",var);
		m_Number=(LPCSTR)var.pbstrVal;
		m_List.SetItemText(nItem,0,m_Name);
		m_List.SetItemText(nItem,1,m_Age);
		m_List.SetItemText(nItem,2,m_Number);
		RecSet.MoveNext();
	}
	RecSet.Close();		//关闭记录集
	this->UpdateData(FALSE);
	db.Close();

}