vcadodlg.cpp

VC中使用ado连接数据库小实例

// VCadoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "VCado.h"
#include "VCadoDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CVCadoDlg dialog

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

void CVCadoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CVCadoDlg)
	DDX_Control(pDX, IDC_BUTTON4, m_lastrecord);
	DDX_Control(pDX, IDC_BUTTON1, m_prerecord);
	DDX_Control(pDX, IDC_BUTTON3, m_firstrecord);
	DDX_Control(pDX, IDC_BUTTON2, m_nextrecord);
	DDX_Text(pDX, IDC_EDIT1, m_id);
	DDX_Text(pDX, IDC_EDIT2, m_name);
	DDX_Text(pDX, IDC_EDIT3, m_sex);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CVCadoDlg, CDialog)
	//{{AFX_MSG_MAP(CVCadoDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_DESTROY()
	ON_BN_CLICKED(IDC_BUTTON1, Onprerecord)
	ON_BN_CLICKED(IDC_BUTTON2, Onnextrecord)
	ON_BN_CLICKED(IDC_BUTTON3, Onfirstrecord)
	ON_BN_CLICKED(IDC_BUTTON4, Onlastrecord)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CVCadoDlg message handlers

BOOL CVCadoDlg::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
	try
	{
		//连接数据库
		m_pConnection.CreateInstance("ADODB.Connection");//连接对象实例	
		_bstr_t strConnect = "Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=ado1DB;Data Source=127.0.0.1;";
		m_pConnection->Open(strConnect,"sa","",adModeUnknown);
	}
	catch (_com_error e) //捕捉异常
	{
		CString errormessage;
		errormessage.Format("连接数据库失败！\r\n错误信息：%s",e.ErrorMessage());
		AfxMessageBox(errormessage); //显示错误信息
	}
	
	//显示记录
	CString strSQL="SELECT * FROM PerInf";
    try
	{
		m_pRecordset.CreateInstance(__uuidof(Recordset));//创建记录集对象实例
		//从数据库中打开表
		m_pRecordset->Open(_bstr_t(strSQL),m_pConnection.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
	}
	catch(_com_error e) //捕捉错误信息
	{
		CString strError;
		strError.Format("警告：打开数据表时发生异常。错误信息：%s",e.ErrorMessage());
		AfxMessageBox(strError);
	}
	m_pRecordset->MoveFirst(); //移到第一条记录
    m_prerecord.EnableWindow(false);
	m_firstrecord.EnableWindow(false);
	UpdateData(false);
	ShowRecord();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CVCadoDlg::OnDestroy() 
{
	CDialog::OnDestroy();
	
	// TODO: Add your message handler code here

    if (m_pRecordset!=NULL)
    {
		m_pRecordset->Close();   //关闭记录集对象
		m_pRecordset=NULL;
    }
	if (m_pConnection->State)
	{
		m_pConnection->Close();   //关闭连接对象
		m_pConnection=NULL;
	}
}

void CVCadoDlg::ShowRecord()
{
	m_id=(char*)_bstr_t(m_pRecordset->GetCollect("Pid"));
	m_name=(char*)_bstr_t(m_pRecordset->GetCollect("Pname"));
	m_sex=(char*)_bstr_t(m_pRecordset->GetCollect("Psex"));
	UpdateData(false);
}

void CVCadoDlg::Onprerecord() 
{
	// TODO: Add your control notification handler code here
	
}

void CVCadoDlg::Onnextrecord() 
{
	// TODO: Add your control notification handler code here
	
}

void CVCadoDlg::Onfirstrecord() 
{
	// TODO: Add your control notification handler code here
	
}

void CVCadoDlg::Onlastrecord() 
{
	// TODO: Add your control notification handler code here
	
}