maoyeahdlg.cpp

较好的数据库编程

// maoyeahDlg.cpp : implementation file
//

#include "stdafx.h"
#include "maoyeah.h"
#include "maoyeahDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CMaoyeahDlg dialog

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

void CMaoyeahDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMaoyeahDlg)
	DDX_Text(pDX, IDC_EDIT1, m_id);
	DDX_Text(pDX, IDC_EDIT2, m_name);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMaoyeahDlg, CDialog)
	//{{AFX_MSG_MAP(CMaoyeahDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTN_QUERY, OnBtnQuery)
	ON_BN_CLICKED(IDC_BTN_ADD, OnBtnAdd)
	ON_BN_CLICKED(IDC_BTN_DEL, OnBtnDel)
	ON_BN_CLICKED(IDC_BTN_MODIFY, OnBtnModify)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMaoyeahDlg message handlers

BOOL CMaoyeahDlg::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
	m_id="1";
	UpdateData(FALSE);
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CMaoyeahDlg::OnBtnQuery() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	m_name="";
	UpdateData(FALSE);
	if(m_id=="")
	{
		MessageBox("输入ID不能为空！");
		return;
	}


	_RecordsetPtr pRs;	//定义记录集对象

	if (FAILED(pRs.CreateInstance("ADODB.Recordset")))
	{
		AfxMessageBox("Create Instance failed!");
		return;
	}
	
	CString strSRC=GetConnStr();	//数据库链接字符串
	
	CString strSQL;
	strSQL.Format("select * from table1 where id=%s",m_id);
	

	if (FAILED(pRs->Open((_variant_t)strSQL,(_variant_t)strSRC,adOpenStatic,adLockOptimistic,adCmdText)))
	{
		AfxMessageBox("Can not open Database!");
		pRs.Release();
		return;
	}

	while(!pRs->rsEOF)
	{
		_variant_t varName;

		varName = pRs->GetCollect ("name");

		m_name=(char *)_bstr_t(varName);

		pRs->MoveNext();
	}


	UpdateData(FALSE);

	pRs.Release();

}

void CMaoyeahDlg::OnBtnAdd() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	if(m_name=="")
	{
		MessageBox("输入姓名不能为空！");
		return;
	}


	_RecordsetPtr pRs;

	if (FAILED(pRs.CreateInstance("ADODB.Recordset")))
	{
		AfxMessageBox("Create Instance failed!");
		return;
	}
	
	CString strSRC=GetConnStr();
	
//	CString strSQL;
//	strSQL.Format("select * from table1 where id=%s",m_id);

	if (FAILED(pRs->Open("select * from table1",(_variant_t)strSRC,adOpenStatic,adLockOptimistic,adCmdText)))
	{
		AfxMessageBox("Can not open Database!");
		pRs.Release();
		return;
	}

	pRs->AddNew();
	pRs->PutCollect(L"name",   (_variant_t)m_name);
	pRs->Update();

//	UpdateData(FALSE);	
	pRs.Release();
}

void CMaoyeahDlg::OnBtnDel() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	if(m_id=="")
	{
		MessageBox("输入ID不能为空！");
		return;
	}


	_RecordsetPtr pRs;

	if (FAILED(pRs.CreateInstance("ADODB.Recordset")))
	{
		AfxMessageBox("Create Instance failed!");
		return;
	}
	
	CString strSRC=GetConnStr();
	
	CString strSQL;
	strSQL.Format("select * from table1 where id=%s",m_id);

	if (FAILED(pRs->Open((_variant_t)strSQL,(_variant_t)strSRC,adOpenStatic,adLockOptimistic,adCmdText)))
	{
		AfxMessageBox("Can not open Database!");
		pRs.Release();
		return;
	}

	pRs->Delete(adAffectCurrent);
	pRs->Update();

	m_name="";
	UpdateData(FALSE);	
	pRs.Release();
}

void CMaoyeahDlg::OnBtnModify() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	if(m_id=="" || m_name=="")
	{
		MessageBox("两者都不能为空！");
		return;
	}


	_RecordsetPtr pRs;

	if (FAILED(pRs.CreateInstance("ADODB.Recordset")))
	{
		AfxMessageBox("Create Instance failed!");
		return;
	}
	
	CString strSRC=GetConnStr();
	
	CString strSQL;
	strSQL.Format("select * from table1 where id=%s",m_id);
	
	if (FAILED(pRs->Open((_variant_t)strSQL,(_variant_t)strSRC,adOpenStatic,adLockOptimistic,adCmdText)))
	{
		AfxMessageBox("Can not open Database!");
		pRs.Release();
		return;
	}
	
	pRs->PutCollect("name",(_variant_t)m_name);

	pRs->Update();


//	UpdateData(FALSE);	
	pRs.Release();
}

CString CMaoyeahDlg::GetConnStr()	//把数据库链接字符串写成一个函数
{
	char path[ MAX_PATH ] = { '\0' }; 
	CString strSRC="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=";
	GetCurrentDirectory( MAX_PATH, path ); 
	CString pathstr;
	pathstr.Format("%s",path);
	strSRC +=pathstr;
	strSRC += "\\www_maoyeah_com.mdb"; 
	strSRC +=";Persist Security Info=False";

	return strSRC;
}