adotestdlg.cpp

使用VC开发的ADO反问数据库的小程序

// ADOTestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ADOTest.h"
#include "ADOTestDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CADOTestDlg dialog

CADOTestDlg::CADOTestDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CADOTestDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CADOTestDlg)
		// 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);
	m_pConn.CreateInstance(__uuidof(Connection));
}

void CADOTestDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CADOTestDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CADOTestDlg, CDialog)
	//{{AFX_MSG_MAP(CADOTestDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_CONNECT, OnConnect)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CADOTestDlg message handlers

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

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

void CADOTestDlg::OnConnect() 
{
	// TODO: Add your control notification handler code here
	CString strConn;
	CString  string;
	strConn="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\try\\bookmanagesys\\bookmanagesys.mdb";
	if(ConnectDB(strConn))
	{
		AfxMessageBox("数据库连接成功!");
	}
	else
	{
		AfxMessageBox("数据库连接失败!");
		return;
	}
	
	_RecordsetPtr pRs;
	pRs.CreateInstance(__uuidof (Recordset));
  //  pRs->Open("newusertable",_variant_t((IDispatch*)m_pConn,true),adOpenKeyset,adLockOptimistic,adCmdTable);
    CString strSQL="SELECT  userlevel FROM  newusertable WHERE username='Kate' ";
//	try
//	{
	pRs->Open((LPCSTR)strSQL,_variant_t((IDispatch*)m_pConn,true),adOpenKeyset,adLockOptimistic,adCmdText);
	//	if(pRs->BOF &&pRs->EOF)
	//		return ;
	//	pRs->MoveFirst();
	string=GetRecordItem(  pRs,  "userlevel");
             string=string+'-';
             string=string+'&';
             pRs->Close();
             m_pConn->Close();
			 //	}        
//	catch(_com_error &e)
//	{   /*	string=GetRecordItem(  pRs,  "userlevel");
            // string=string+'-';
             //string=string+'&';*/
//		return ;
//	}
//	string=GetRecordItem(  pRs,  "userpasswd");
  //  string=string+'-';
    //string=string+'&';
}
	


	/*	CString strSQL="INSERT INTO newusertable VALUES ('8','9','1') ";
	//="INSERT INTO newusertable VALUES ('111','111',1) "; //SQL语句
//	strSQL.Format( "insert into %s values('%s','%s',%d)",
	//	"newusertable, "111","111",1 );


	try
	{
		pRs->Open((LPCSTR)strSQL,_variant_t((IDispatch*)m_pConn,true),adOpenKeyset,adLockOptimistic,adCmdText);
	//	if(pRs->BOF &&pRs->EOF)
	//		return ;
		pRs->MoveFirst();
	}
	catch(_com_error &e)
	{
		return ;
	}
	pRs->Close();
	m_pConn->Close();
}*/

BOOL CADOTestDlg::ConnectDB(CString strConn)
{
	try
	{
		m_pConn->ConnectionString=(LPCSTR)strConn;
		m_pConn->Open("","","",adConnectUnspecified);
		return TRUE;
	}
	catch(_com_error &e)
	{
		AfxMessageBox(e.Description());
//		AfxMessageBox("Error in CADOTestDlg::ConnectDB");
		return FALSE;
	}
	return TRUE;
}

CString CADOTestDlg::GetRecordItem(_Recordset *pRs, CString strItemName)
{
   try
   {
	CString str;
	FieldsPtr m_pFieldsPtr;
	FieldPtr m_pFieldPtr;
	m_pFieldsPtr=pRs->Fields;
	m_pFieldPtr=m_pFieldsPtr->Item[(LPCSTR)strItemName];
	if(m_pFieldPtr->Value.vt==VT_NULL)
		str="";
	else
		str.Format((char *)_bstr_t(m_pFieldPtr->Value));

	return str;
   }
   catch(_com_error &e)
   {
	  // return;
   }

}