如何得到一个已经存在表的字段数目啊?我是VC+ADO +Access编程,有没有SQL语句可以用啊??
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FieldsPtr m_pFields;
FieldPtr m_pField;
m_pFields=m_pRs->GetFields();
int index=m_pFields->Count;//index就是字段数
http://www.csdn.net/cnshare/soft/14/14373.shtm,这个例子看不明白,因为我不知道运行起来该怎么用
FieldsPtr m_pFields; //没有该类型
FieldPtr m_pField;//没有该类型
而 m_pRs也没有GetFields()的成员函数
laiyiling(最熟悉的陌生人):ok!
#import "c:\program files\common files\system\ado\msado15.dll" no_namespace rename ("EOF", "adoEOF")
记得 CoInitialize(NULL)
和 UnCoInitialize()
我用ADO也不是一天两天了。。只是一直没用过
FieldsPtr m_pFields;
FieldPtr m_pField;
//#include "stdafx.h"
#include "syb1.h"
#include "syb1Dlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif#include <comdef.h>
#import "C:\program files\common files\system\ado\msado26.tlb" no_namespace rename("EOF", "adoEOF")/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass 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()/////////////////////////////////////////////////////////////////////////////
// CSyb1Dlg dialogCSyb1Dlg::CSyb1Dlg(CWnd* pParent /*=NULL*/)
: CDialog(CSyb1Dlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CSyb1Dlg)
// 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); //com
::CoInitialize(NULL);
}void CSyb1Dlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CSyb1Dlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CSyb1Dlg, CDialog)
//{{AFX_MSG_MAP(CSyb1Dlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
ON_WM_DESTROY()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CSyb1Dlg message handlersBOOL CSyb1Dlg::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 CSyb1Dlg::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 CSyb1Dlg::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 CSyb1Dlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}void CSyb1Dlg::OnButton1()
{
//测试连接sybase数据库。
_ConnectionPtr ptrConnect;
_RecordsetPtr ptrRcdSet; ptrConnect.CreateInstance(_uuidof(Connection));
CString szSQL;
szSQL = "select * from tab_1";
HRESULT hr = ptrConnect->Open("FILE NAME=C:\\Program Files\\Common Files\\ODBC\\Data Sources\\mysybase.dsn","sa","",0);
if(FAILED(hr)) return;
_variant_t vRecsAffected(0L); //ptrRcdSet = ptrConnect->Execute(_bstr_t(szSQL),&vRecsAffected,adOptionUnspecified);
_variant_t varCode1;
_variant_t varCode2;
try
{
CString strMsg;
ptrRcdSet.CreateInstance("ADODB.Recordset");
ptrRcdSet->Open(_bstr_t(szSQL),"FILE NAME=C:\\Program Files\\Common Files\\ODBC\\Data Sources\\mysybase.dsn",adOpenStatic,adLockReadOnly,adCmdText);
if(!ptrRcdSet->GetadoEOF())
{
ptrRcdSet->MoveFirst();
while (!ptrRcdSet->GetadoEOF()) {
FieldsPtr fields = ptrRcdSet->GetFields();
FieldPtr field = fields->GetItem(_bstr_t("code1"));
_variant_t variant1;
field->get_Value(&variant1);
varCode1 = ptrRcdSet->GetCollect("code1");
varCode2 = ptrRcdSet->GetCollect("code2");
//test
strMsg.Format("code1 = %f,code2 = %f,fieldcount = %d",(double)varCode1,(double)varCode2,fields->GetCount());
AfxMessageBox(strMsg);
//保证提示fieldcount = 2
ptrRcdSet->MoveNext();
}
}
ptrRcdSet->Close();
}
catch(CException *pEx)
{
//MFC 异常
char pszMsg[256];
pEx->GetErrorMessage(pszMsg,256); TRACE("TestFunc,MFC ERROR:%s",pszMsg);
}
catch(_com_error &eX)
{
//Com 异常
TRACE("TestFunc,COM ERROR:%s",eX.ErrorMessage());
}
catch(...)
{
//未知的异常
TRACE("TestFunc,UNKNOWN ERROR");
}
ptrConnect->Close();
}void CSyb1Dlg::OnDestroy()
{
::CoUninitialize();
CDialog::OnDestroy();
}
Name: 获取当前记录集中字段数目
==========================================================================*/
long CAdoRecordSet::GetFieldsCount()
{
ASSERT(m_pRecordset != NULL);
try
{
return GetFields()->Count;
}
catch(_com_error e)
{
TRACE(_T(":( GetFieldsCount发生异常: %s\n"), e.ErrorMessage());
return -1;
}
}你可以执行select语句获取某一条记录的所有字段值,如select * from student where name = "kvw3000",利用上面的方法就可以获得这个表的字段数