三、程序代码
/////////////////////////////////////////////////// ADOTest1Dlg.h : header file
#if !defined(AFX_ADOTEST1DLG_H__29B385C0_02C0_4588_A8B4_D0EFBB4F578D__INCLUDED_)
#define AFX_ADOTEST1DLG_H__29B385C0_02C0_4588_A8B4_D0EFBB4F578D__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CADOTest1Dlg : public CDialog
{
// Construction
public:
BOOL m_bAutoSave;
void SaveData();
void LoadData();
_variant_t vUserID,vUsername,vOld,vBirthday;
BOOL m_bSuccess;
int m_nCurrentSel;
_RecordsetPtr m_pRecordset;
CADOTest1Dlg(CWnd* pParent = NULL); // standard constructor
// Dialog Data
//{{AFX_DATA(CADOTest1Dlg)
enum { IDD = IDD_ADOTEST1_DIALOG };
CButton m_cDelItem;
CButton m_cAddItem;
CListCtrl m_userlist;
UINT m_nUserID;
UINT m_nOld;
CString m_sUsername;
COleDateTime m_tBirthday;
//}}AFX_DATA
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CADOTest1Dlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
HICON m_hIcon;
// Generated message map functions
//{{AFX_MSG(CADOTest1Dlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
virtual void OnOK();
afx_msg void OnAdditem();
afx_msg void OnDelitem();
afx_msg void OnItemchangedUserlist(NMHDR* pNMHDR, LRESULT* pResult);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
#endif
////////////////////////////////////////////////////// ADOTest1Dlg.cpp : implementation file
#include "stdafx.h"
#include "ADOTest1.h"
#include "ADOTest1Dlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
extern CADOTest1App theApp;
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()
CADOTest1Dlg::CADOTest1Dlg(CWnd* pParent /*=NULL*/)
: CDialog(CADOTest1Dlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CADOTest1Dlg)
m_nUserID = 0;
m_nOld = 0;
m_sUsername = _T("");
m_tBirthday = COleDateTime::GetCurrentTime();
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
m_nCurrentSel = -1;
m_bSuccess = FALSE;
m_bAutoSave = TRUE;
}
void CADOTest1Dlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CADOTest1Dlg)
DDX_Control(pDX, IDC_DELITEM, m_cDelItem);
DDX_Control(pDX, IDC_ADDITEM, m_cAddItem);
DDX_Control(pDX, IDC_USERLIST, m_userlist);
DDX_Text(pDX, IDC_USERID, m_nUserID);
DDX_Text(pDX, IDC_OLD, m_nOld);
DDX_Text(pDX, IDC_USERNAME, m_sUsername);
DDX_DateTimeCtrl(pDX, IDC_DATETIMEPICKER1, m_tBirthday);
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CADOTest1Dlg, CDialog)
//{{AFX_MSG_MAP(CADOTest1Dlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_ADDITEM, OnAdditem)
ON_BN_CLICKED(IDC_DELITEM, OnDelitem)
ON_NOTIFY(LVN_ITEMCHANGED, IDC_USERLIST, OnItemchangedUserlist)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
BOOL CADOTest1Dlg::OnInitDialog()
{
CDialog::OnInitDialog();
m_cDelItem.EnableWindow(FALSE);
::SendMessage(m_userlist.m_hWnd, LVM_SETEXTENDEDLISTVIEWSTYLE,
LVS_EX_FULLROWSELECT, LVS_EX_FULLROWSELECT);
//////////为列表控件添加列//////////
m_userlist.InsertColumn(0,"用户ID",LVCFMT_LEFT,60);
m_userlist.InsertColumn(1,"用户名",LVCFMT_LEFT,100);
m_userlist.InsertColumn(2,"年龄",LVCFMT_LEFT,60);
m_userlist.InsertColumn(3,"生日",LVCFMT_LEFT,100);
//////////读取数据库中的信息添加到列表控件///////////
int nItem;
_variant_t vUsername,vBirthday,vID,vOld;
try
{
m_pRecordset.CreateInstance("ADODB.Recordset");
m_pRecordset->Open("SELECT*FROM users",
_variant_t((IDispatch*)theApp.m_pConnection,true),
adOpenStatic,adLockOptimistic,adCmdText);
m_bSuccess = TRUE;
while(!m_pRecordset->adoEOF)
{
vID = m_pRecordset->GetCollect("ID");
vUsername = m_pRecordset->GetCollect("username");
vOld = m_pRecordset->GetCollect("old");
vBirthday = m_pRecordset->GetCollect("birthday");
nItem=m_userlist.InsertItem(0xffff,(_bstr_t)vID);
m_userlist.SetItem(nItem,1,1,(_bstr_t)vUsername,NULL,0,0,0);
m_userlist.SetItem(nItem,2,1,(_bstr_t)vOld,NULL,0,0,0);
m_userlist.SetItem(nItem,3,1,(_bstr_t)vBirthday,NULL,0,0,0);
m_pRecordset->MoveNext();
}
}
catch(_com_error e)///捕捉异常
{
AfxMessageBox("读取数据库失败!");///显示错误信息
}
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);
}
}
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
return TRUE; // return TRUE unless you set the focus to a control
}
void CADOTest1Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
void CADOTest1Dlg::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();
}
}
HCURSOR CADOTest1Dlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
void CADOTest1Dlg::OnOK()
{
if(m_bSuccess)
{
m_pRecordset->Update();
m_pRecordset->Close();
}
CDialog::OnOK();
}
void CADOTest1Dlg::OnAdditem()
{
if(UpdateData())
if(m_sUsername.GetLength()>0)
{
m_pRecordset->AddNew();
m_nCurrentSel = m_userlist.InsertItem(0xffff,"");
SaveData();///保存数据
m_userlist.SetItemState(m_nCurrentSel,LVIS_SELECTED|LVIS_FOCUSED,LVIS_SELECTED|LVIS_FOCUSED);
m_userlist.SetHotItem(m_nCurrentSel);
m_userlist.SetFocus();
}
else
AfxMessageBox("请输入用户名");
}
void CADOTest1Dlg::OnDelitem()
{
m_bAutoSave = FALSE;
if(m_nCurrentSel >= 0)
{
m_userlist.DeleteItem(m_nCurrentSel);
int count = m_userlist.GetItemCount();
if(count <= m_nCurrentSel)
m_nCurrentSel = count-1;
m_pRecordset->Delete(adAffectCurrent);
m_pRecordset->MoveNext();
LoadData();
m_userlist.SetItemState(m_nCurrentSel,LVIS_SELECTED|LVIS_FOCUSED,LVIS_SELECTED|LVIS_FOCUSED);
m_userlist.SetFocus();
}
m_bAutoSave = TRUE;
}
//////////在选择列表框的时候调用///////////////////
void CADOTest1Dlg::OnItemchangedUserlist(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
if(pNMListView->uNewState&LVIS_SELECTED)
{
UpdateData();
SaveData();///保存旧数据
m_nCurrentSel = pNMListView->iItem;
LoadData();///加载新数据
m_cDelItem.EnableWindow();
}
*pResult = 0;
}
//////将记录集中的数据加载到编辑框/////
void CADOTest1Dlg::LoadData()
{
m_pRecordset->Move(m_nCurrentSel,_variant_t((long)adBookmarkFirst));
vUserID = m_pRecordset->GetCollect("ID");
vUsername = m_pRecordset->GetCollect("username");
vOld = m_pRecordset->GetCollect("old");
vBirthday = m_pRecordset->GetCollect("birthday");
m_nUserID = vUserID.lVal;
m_sUsername = (LPCTSTR)(_bstr_t)vUsername;
m_nOld = vOld.lVal;
m_tBirthday = vBirthday;
UpdateData(FALSE);
}
/////将编辑框的数据保存到记录集与列表框
void CADOTest1Dlg::SaveData()
{
if(!m_pRecordset->adoEOF && m_nCurrentSel >= 0 && m_bAutoSave)
{
vUserID = (long)m_nUserID;
vUsername = m_sUsername;
vOld = (long)m_nOld;
vBirthday = m_tBirthday;
m_pRecordset->PutCollect("ID",vUserID);
m_pRecordset->PutCollect("username",vUsername);
m_pRecordset->PutCollect("old",vOld);
m_pRecordset->PutCollect("birthday",vBirthday);
m_userlist.SetItem(m_nCurrentSel,0,LVIF_TEXT,(_bstr_t)vUserID,NULL,0,0,0);
m_userlist.SetItem(m_nCurrentSel,1,LVIF_TEXT,(_bstr_t)vUsername,NULL,0,0,0);
m_userlist.SetItem(m_nCurrentSel,2,LVIF_TEXT,(_bstr_t)vOld,NULL,0,0,0);
m_userlist.SetItem(m_nCurrentSel,3,LVIF_TEXT,(_bstr_t)vBirthday,NULL,0,0,0);
}
}
////////////////////////////////////////////////////////////////////////
BOOL CADOTest1App::InitInstance()
{
AfxEnableControlContainer();
AfxOleInit();///初始化COM库
HRESULT hr; ////////////连接数据库//////////////
try
{
hr = m_pConnection.CreateInstance("ADODB.Connection");///创建Connection对象
if(SUCCEEDED(hr))
{
hr = m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;
Data Source=test.mdb","","",adModeUnknown);///连接数据库
///上面一句中连接字串中的Provider是针对ACCESS2000环境的，
/////对于ACCESS97,需要改为:Provider=Microsoft.Jet.OLEDB.3.51; }
}
}
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
return FALSE;
}
#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif
CADOTest1Dlg dlg;
m_pMainWnd = &dlg;
int nResponse = dlg.DoModal();
if (nResponse == IDOK)
{}
else if (nResponse == IDCANCEL)
{}
return FALSE;
}
/////////////////////////////////////////////
int CADOTest1App::ExitInstance()
{
if(m_pConnection->State)
m_pConnection->Close(); ///如果已经打开了连接则关闭它
return CWinApp::ExitInstance();
} |
四、小结
限于篇幅ADO中的许多内容还没有介绍，如绑定方式处理记录集数据、存储过程的调用、事务处理、图象在数据库中的保存与读取、与表格控件的配合使用等。如果读者对上述内容感性认识的话，可以自行参考相关编程资料。
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