adoadodlg.cpp

用ado连接数据库access的详细代码（可能还有一些功能有待完善

// ADoADoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ADoADo.h"
#include "ADoADoDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#include"Mmsystem.h"
extern CADoADoApp theApp;
/////////////////////////////////////////////////////////////////////////////
// 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)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CADoADoDlg dialog

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

void CADoADoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CADoADoDlg)
	DDX_Control(pDX, IDC_Listaccess, m_AccessList);
	DDX_Text(pDX, IDC_AGE, m_Age);
	DDX_Text(pDX, IDC_NAME, m_Name);
	DDX_Text(pDX, IDC_NUM, m_Num);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CADoADoDlg, CDialog)
//{{AFX_MSG_MAP(CADoADoDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_ReadAccess, OnReadAccess)
ON_LBN_SELCHANGE(IDC_Listaccess, OnSelchangeListaccess)
ON_BN_CLICKED(IDC_WriteAccess, OnWriteAccess)
ON_BN_CLICKED(IDC_Modify, OnModify)
ON_BN_CLICKED(IDC_Delete, OnDelete)
ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_tuichu, Ontuichu)
	ON_BN_CLICKED(IDC_music, Onmusic)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CADoADoDlg message handlers

BOOL CADoADoDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	m_pRecordset.CreateInstance(__uuidof(Recordset));//使用ADO创建数据库记录集
	// Add "About..." menu item to system menu.
	try
	{
		m_pRecordset->Open("SELECT * FROM 数表",                // 查询DemoTable表中所有字段
			theApp.m_pConnection.GetInterfacePtr(),	 // 获取库接库的IDispatch指针
			adOpenDynamic,////注意声明全局变量CNewadoApp theApp为外部变量即extern CNewadoApp theApp；因为app是一个全局类对象。所以要声明
			adLockOptimistic,
			adCmdText);
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}
	
	// 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 CADoADoDlg::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 CADoADoDlg::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 CADoADoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CADoADoDlg::OnReadAccess() 
{
	
	
	
	//先关闭已经打开的记录集对象
	m_pRecordset->Close();
	try
	{
		m_pRecordset->Open("SELECT * FROM 数表 order by CreateTime",                // 查询DemoTable表中所有字段
			theApp.m_pConnection.GetInterfacePtr(),	 // 获取库接库的IDispatch指针
			adOpenDynamic,
			adLockOptimistic,
			adCmdText);
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}
	
	ListData();////注意要对这个类进行声明
	////做法：在CNewadoDlg右键点击 add menber function-》再定义类型为void的函数
	
	
}

void CADoADoDlg::ListData()
{

    _variant_t var;
	CString strName,strAge,strNum;
	
	//效清空列表框
	//	m_AccessList.ResetContent();//////注意m_AccessList需被定义声明
    m_AccessList.ResetContent(); 
	//先建立一个列表框Listaccess，-》改名-》声明一个列表框的成员变量m_AccessList
    strName=strAge=strNum = "";
	
	//在ADO操作中建议语句中要常用try...catch()来捕获错误信息，
	//因为它有时会经常出现一些想不到的错误。
	try
	{
		if(!m_pRecordset->BOF)
			m_pRecordset->MoveFirst();
		else
		{
			AfxMessageBox("表内数据为空");
			return;
		}
		
		// 读入库中各字段并加入列表框中
		while(!m_pRecordset->adoEOF)
		{
			var = m_pRecordset->GetCollect("Name");
			if(var.vt != VT_NULL)
				strName = (LPCSTR)_bstr_t(var);
			
			var = m_pRecordset->GetCollect("Age");
			if(var.vt != VT_NULL)
				strAge = (LPCSTR)_bstr_t(var);
			
            var = m_pRecordset->GetCollect("Num");
			if(var.vt != VT_NULL)
				strNum = (LPCSTR)_bstr_t(var);
			

		
			
			m_AccessList.AddString( strName + " ---> "+strAge +"--->"+strNum );
			
			//	m_AccessList.AddString (strid+"-->"+strName+"-->"+strAge+"-->"+strnum);
			//		m_AccessList.AddString(strid+"-->"strName+" -->"+strAge+"-->"+strnum);
			m_pRecordset->MoveNext();	
		}
		//	m_pRecordset->MoveNext();
		
		// 默认列表指向第一项，同时移动记录指针并显示
		m_AccessList.SetCurSel(0);
		OnSelchangeListaccess();///前一步已经对这个列表框命名 现在要建立一个类向导；
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}
}



void CADoADoDlg::OnSelchangeListaccess() 
{
	
	int curSel = m_AccessList.GetCurSel();		
	_variant_t var,varIndex;
	
	if(curSel < 0)
		return;
	
	try