myconntrydlg.cpp

编程实例

// MyConnTryDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MyConnTry.h"
#include "MyConnTryDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CMyConnTryDlg dialog

CMyConnTryDlg::CMyConnTryDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMyConnTryDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMyConnTryDlg)
		// 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 CMyConnTryDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMyConnTryDlg)
	DDX_Control(pDX, IDC_DATAGRID_TRY, m_dbGrid);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMyConnTryDlg, CDialog)
	//{{AFX_MSG_MAP(CMyConnTryDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTN_TRY, OnBtnTry)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyConnTryDlg message handlers

BOOL CMyConnTryDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	//CoInitialize(NULL); //初始化OLE/COM库环境 

	// 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

	// 创建ADO的数据库连接和记录集对象
	HRESULT	hr;
	_bstr_t strConn("Provider=SQLOLEDB.1;Password=begin_sa;"
		"Persist Security Info=True;User ID=sa;"
		"Initial Catalog=Students;Data Source=GXP");

	
	try
	{
		hr = m_pConnection.CreateInstance(_uuidof(Connection));
		if(SUCCEEDED(hr))
		{
			m_pConnection->CursorLocation = adUseServer;
			hr = m_pConnection->Open(strConn, "", "", adConnectUnspecified);
		}
		if(SUCCEEDED(hr))
		{
			hr = m_pRecordset.CreateInstance(_uuidof(Recordset));
		}
		if(SUCCEEDED(hr))
		{
			m_blnConnected = TRUE;
		}
		else
		{
			m_blnConnected = FALSE;
		}
	}
	catch(_com_error &e)
	{
		MessageBox(e.ErrorMessage());
		m_blnConnected = FALSE;
	}

	if(!m_blnConnected)
	{
		AfxMessageBox("ADO数据源初始化失败!");
	}
	else
	{
		m_strSource = (const char*)strConn;
	}
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CMyConnTryDlg::OnBtnTry() 
{
	// TODO: Add your control notification handler code here
	int i;
	
	_bstr_t strSource("select * from uCoursesTeacher");

	CString str;
	_variant_t    vIndex;

	if(m_pRecordset->State == adStateOpen)
	{
		m_pRecordset->Close();
	}
	
	m_pRecordset->LockType = adLockOptimistic;
	m_pRecordset->CursorType = adOpenDynamic;
	m_pRecordset->CursorLocation = adUseServer;

	// _bstr_t source = m_strSource;然后用source字符串作为Open函数的第二个
	// 参数，也可以打开记录集。然而此时不能执行事务。 必须将Connection对象的
	// 指针传递给Open函数，然后才能使得事务生效。
	m_pRecordset->Open(strSource, _variant_t((IDispatch*)m_pConnection,true), 
		adOpenDynamic, adLockOptimistic, adCmdText);
	
	m_pConnection->BeginTrans();

	for(i =1; i<=5; i++)
	{
		str.Format("%d", i);
		m_pRecordset->AddNew();

		vIndex = (short)0;
		m_pRecordset->PutCollect(&vIndex, _variant_t(str + "_YOU"));

		vIndex = (short)1;
		m_pRecordset->PutCollect(&vIndex, _variant_t(str + "_I"));
		
		vIndex = (short)2;
		m_pRecordset->PutCollect(&vIndex, _variant_t(str + "_HE"));
		
		m_pRecordset->Update();
	}

	if(MessageBox("要保存所有变化吗?", NULL, MB_ICONQUESTION | MB_YESNO)
		== IDYES)
	{
		m_pConnection->CommitTrans();
	}
	else
	{
		m_pConnection->RollbackTrans();
	}

	m_pRecordset->Close();

	m_pRecordset->LockType = adLockOptimistic;
	m_pRecordset->CursorType = adOpenDynamic;
	m_pRecordset->CursorLocation = adUseClient;
	
	m_pRecordset->Open(strSource, _variant_t((IDispatch*)m_pConnection,true), 
		adOpenDynamic, adLockOptimistic, adCmdText);

	m_dbGrid.SetRefDataSource((LPUNKNOWN)m_pRecordset);
}

BOOL CMyConnTryDlg::DestroyWindow() 
{
	// TODO: Add your specialized code here and/or call the base class
//	CoUninitialize();//释放程序占用的COM 资源
	return CDialog::DestroyWindow();
}