学习VC++深入浅出——ADO的使用
2008-03-20 00:18
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学习VC++深入浅出——ADO的使用
_ConnectionPtr m_pConnection;
// 初始化COM,创建ADO连接等操作
AfxOleInit();
m_pConnection.CreateInstance(__uuidof(Connection));
// 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。jingzhou xu
try
...{
// 打开本地Access库Demo.mdb
m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Demo.mdb","","",adModeUnknown);
}
catch(_com_error e)
...{
AfxMessageBox("数据库连接失败，确认数据库Demo.mdb是否在当前路径下!");
return FALSE;
}
int CChatApp::ExitInstance()
...{
// TODO: Add your specialized code here and/or call the base class
if(m_pConnection->State)
m_pConnection->Close();
m_pConnection= NULL;
return CWinApp::ExitInstance();
}
_ConnectionPtr m_pConnection;
_CommandPtr m_pCommand;
_RecordsetPtr m_pRecordset;
// TODO: Add extra initialization here
// 使用ADO创建数据库记录集
1e65c
m_pRecordset.CreateInstance(__uuidof(Recordset));
// 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。jingzhou xu
try
...{
m_pRecordset->Open("SELECT * FROM DemoTable", // 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());
}
return TRUE; // return TRUE unless you set the focus to a control
}
void CChatDlg::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 CChatDlg::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 CChatDlg::OnQueryDragIcon()
...{
return (HCURSOR) m_hIcon;
}
void CChatDlg::OnButtonRead()
...{
// TODO: Add your control notification handler code here
_variant_t var;
CString strName,strAge;
// 清空列表框
m_AccessList.ResetContent();
strName=strAge="";
// 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。jingzhou xu
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);
m_AccessList.AddString( strName + " --> "+strAge );
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);
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnSelchangeList1()
...{
// TODO: Add your control notification handler code here
int curSel = m_AccessList.GetCurSel();
_variant_t var,varIndex;
if(curSel < 0)
return;
try
...{
// 先将指针移向第一条记录，然后就可以相对第一条记录来随意移动记录指针
m_pRecordset->MoveFirst();
m_pRecordset->Move(long(curSel));
var = m_pRecordset->GetCollect("Name");
if(var.vt != VT_NULL)
m_Name = (LPCSTR)_bstr_t(var);
var = m_pRecordset->GetCollect("Age");
if(var.vt != VT_NULL)
m_Age = (LPCSTR)_bstr_t(var);
UpdateData(false);
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonInsert()
...{
// TODO: Add your control notification handler code here
UpdateData();
if(m_Name == "" || m_Age == "")
...{
AfxMessageBox("姓名和年龄信息不能为空!");
return;
}
// 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。jingzhou xu
try
...{
// 写入各字段值
m_pRecordset->AddNew();
m_pRecordset->PutCollect("Name", _variant_t(m_Name));
m_pRecordset->PutCollect("Age", atol(m_Age));
m_pRecordset->Update();
AfxMessageBox("插入成功!");
// 更新显示其库内容
int nCurSel = m_AccessList.GetCurSel();
OnReadAccess();
m_AccessList.SetCurSel(nCurSel);
// 移动记录指针到新的位置
// OnSelchangeListaccess();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonModify()
...{
// TODO: Add your control notification handler code here
UpdateData(); // 更新对话框数据
if(m_AccessList.GetCount() == 0 || m_Name == "" || m_Age == "")
...{
AfxMessageBox("表中记录数为空或姓名和年龄信息没有设置!");
return;
}
else if(m_AccessList.GetCurSel() < 0 || m_AccessList.GetCurSel() > m_AccessList.GetCount())
m_AccessList.SetCurSel(0);
// 修改当前记录的字段值
try
...{
m_pRecordset->PutCollect("Name", _variant_t(m_Name));
m_pRecordset->PutCollect("Age", atol(m_Age));
m_pRecordset->Update();
// 重新读入库记录更新显示
int nCurSel = m_AccessList.GetCurSel();
OnReadAccess();
m_AccessList.SetCurSel(nCurSel);
// 移动记录指针到新的位置
// OnSelchangeListaccess();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonDelete()
...{
// TODO: Add your control notification handler code here
if(m_AccessList.GetCount() == 0)
return;
else if(m_AccessList.GetCurSel() < 0 || m_AccessList.GetCurSel() > m_AccessList.GetCount())
m_AccessList.SetCurSel(0);
try
...{
// 删除当前行记录
m_pRecordset->Delete(adAffectCurrent);
m_pRecordset->Update();
// 删除列表中当前值
int nCurSel = m_AccessList.GetCurSel();
m_AccessList.DeleteString(nCurSel);
if(nCurSel == 0 && (m_AccessList.GetCount() != 0))
m_AccessList.SetCurSel(nCurSel);
else if(m_AccessList.GetCount() != 0)
m_AccessList.SetCurSel(nCurSel-1);
// 移动记录指针到新的位置
// OnSelchangeListaccess();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonAbout()
...{
// TODO: Add your control notification handler code here
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
void CChatDlg::OnReadAccess()
...{
_variant_t var;
CString strName,strAge;
// 清空列表框
m_AccessList.ResetContent();
strName=strAge="";
// 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。jingzhou xu
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);
m_AccessList.AddString( strName + " --> "+strAge );
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();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
BOOL CAboutDlg::OnInitDialog()
...{
CDialog::OnInitDialog();
// TODO: Add extra initialization here
//加入EMAIL的超连接
// m_Mail.SetURL(_T("mailto:cqzhangdali@163.com"));
//m_Mail.SetUnderline(FALSE);
return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}
_ConnectionPtr m_pConnection;
// 初始化COM,创建ADO连接等操作
AfxOleInit();
m_pConnection.CreateInstance(__uuidof(Connection));
// 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。jingzhou xu
try
...{
// 打开本地Access库Demo.mdb
m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Demo.mdb","","",adModeUnknown);
}
catch(_com_error e)
...{
AfxMessageBox("数据库连接失败，确认数据库Demo.mdb是否在当前路径下!");
return FALSE;
}
int CChatApp::ExitInstance()
...{
// TODO: Add your specialized code here and/or call the base class
if(m_pConnection->State)
m_pConnection->Close();
m_pConnection= NULL;
return CWinApp::ExitInstance();
}
_ConnectionPtr m_pConnection;
_CommandPtr m_pCommand;
_RecordsetPtr m_pRecordset;
// TODO: Add extra initialization here
// 使用ADO创建数据库记录集
1e65c
m_pRecordset.CreateInstance(__uuidof(Recordset));
// 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。jingzhou xu
try
...{
m_pRecordset->Open("SELECT * FROM DemoTable", // 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());
}
return TRUE; // return TRUE unless you set the focus to a control
}
void CChatDlg::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 CChatDlg::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 CChatDlg::OnQueryDragIcon()
...{
return (HCURSOR) m_hIcon;
}
void CChatDlg::OnButtonRead()
...{
// TODO: Add your control notification handler code here
_variant_t var;
CString strName,strAge;
// 清空列表框
m_AccessList.ResetContent();
strName=strAge="";
// 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。jingzhou xu
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);
m_AccessList.AddString( strName + " --> "+strAge );
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);
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnSelchangeList1()
...{
// TODO: Add your control notification handler code here
int curSel = m_AccessList.GetCurSel();
_variant_t var,varIndex;
if(curSel < 0)
return;
try
...{
// 先将指针移向第一条记录，然后就可以相对第一条记录来随意移动记录指针
m_pRecordset->MoveFirst();
m_pRecordset->Move(long(curSel));
var = m_pRecordset->GetCollect("Name");
if(var.vt != VT_NULL)
m_Name = (LPCSTR)_bstr_t(var);
var = m_pRecordset->GetCollect("Age");
if(var.vt != VT_NULL)
m_Age = (LPCSTR)_bstr_t(var);
UpdateData(false);
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonInsert()
...{
// TODO: Add your control notification handler code here
UpdateData();
if(m_Name == "" || m_Age == "")
...{
AfxMessageBox("姓名和年龄信息不能为空!");
return;
}
// 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。jingzhou xu
try
...{
// 写入各字段值
m_pRecordset->AddNew();
m_pRecordset->PutCollect("Name", _variant_t(m_Name));
m_pRecordset->PutCollect("Age", atol(m_Age));
m_pRecordset->Update();
AfxMessageBox("插入成功!");
// 更新显示其库内容
int nCurSel = m_AccessList.GetCurSel();
OnReadAccess();
m_AccessList.SetCurSel(nCurSel);
// 移动记录指针到新的位置
// OnSelchangeListaccess();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonModify()
...{
// TODO: Add your control notification handler code here
UpdateData(); // 更新对话框数据
if(m_AccessList.GetCount() == 0 || m_Name == "" || m_Age == "")
...{
AfxMessageBox("表中记录数为空或姓名和年龄信息没有设置!");
return;
}
else if(m_AccessList.GetCurSel() < 0 || m_AccessList.GetCurSel() > m_AccessList.GetCount())
m_AccessList.SetCurSel(0);
// 修改当前记录的字段值
try
...{
m_pRecordset->PutCollect("Name", _variant_t(m_Name));
m_pRecordset->PutCollect("Age", atol(m_Age));
m_pRecordset->Update();
// 重新读入库记录更新显示
int nCurSel = m_AccessList.GetCurSel();
OnReadAccess();
m_AccessList.SetCurSel(nCurSel);
// 移动记录指针到新的位置
// OnSelchangeListaccess();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonDelete()
...{
// TODO: Add your control notification handler code here
if(m_AccessList.GetCount() == 0)
return;
else if(m_AccessList.GetCurSel() < 0 || m_AccessList.GetCurSel() > m_AccessList.GetCount())
m_AccessList.SetCurSel(0);
try
...{
// 删除当前行记录
m_pRecordset->Delete(adAffectCurrent);
m_pRecordset->Update();
// 删除列表中当前值
int nCurSel = m_AccessList.GetCurSel();
m_AccessList.DeleteString(nCurSel);
if(nCurSel == 0 && (m_AccessList.GetCount() != 0))
m_AccessList.SetCurSel(nCurSel);
else if(m_AccessList.GetCount() != 0)
m_AccessList.SetCurSel(nCurSel-1);
// 移动记录指针到新的位置
// OnSelchangeListaccess();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
void CChatDlg::OnButtonAbout()
...{
// TODO: Add your control notification handler code here
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
void CChatDlg::OnReadAccess()
...{
_variant_t var;
CString strName,strAge;
// 清空列表框
m_AccessList.ResetContent();
strName=strAge="";
// 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。jingzhou xu
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);
m_AccessList.AddString( strName + " --> "+strAge );
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();
OnSelchangeList1();
}
catch(_com_error *e)
...{
AfxMessageBox(e->ErrorMessage());
}
}
BOOL CAboutDlg::OnInitDialog()
...{
CDialog::OnInitDialog();
// TODO: Add extra initialization here
//加入EMAIL的超连接
// m_Mail.SetURL(_T("mailto:cqzhangdali@163.com"));
//m_Mail.SetUnderline(FALSE);
return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}
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