_RecordsetPtr 中关于pRst变量的函数调用

 

首先参照另一篇http://blog.csdn.net/etwdone/article/details/8484206建立MFC与数据库的连接

接着创见如下界面

接着直接将头文件和CPP放上

ClerkMDlg.h

#pragma once
#include "stdafx.h"
#include "Library.h"
#include "afxdialogex.h"
#include "MainFrm.h"

// CClerkMDlg 对话框

class CClerkMDlg : public CDialog
{
 DECLARE_DYNAMIC(CClerkMDlg)

public:
 CClerkMDlg(CWnd* pParent = NULL);   // 标准构造函数
 virtual ~CClerkMDlg();
 _RecordsetPtr pRst,p,pfirst,plast,pp;
 //CoInitialize(NULL);
 //_RecordsetPtr pRst(Recordset);
// 对话框数据
 enum { IDD = IDD_DIALOG1 };
 CString m_strUserNameQ;
 CString m_strUserNameQQ;
 CString m_strUserIDQ;
 CString m_strUserID;
 CString m_strUserName;
 CString m_strPassWord;
 CString m_strIDCard;
 bool sts;
 void DisplayRecord(_RecordsetPtr pRst );
 BOOL OnInitDialog();
 void SetTextSate();

 
protected:
 virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

 DECLARE_MESSAGE_MAP()
public:
 afx_msg void OnBnClickedFirst();
 afx_msg void OnBnClickedLast();
 afx_msg void OnBnClickedPrior();
 afx_msg void OnBnClickedNest();
 afx_msg void OnBnClickedNew();
 afx_msg void OnBnClickedEdit();
 afx_msg void OnBnClickedEnquery();
 afx_msg void OnBnClickedDelete();
 afx_msg void OnBnClickedSave();
 afx_msg void OnBnClickedCancelRec();
 afx_msg void OnBnClickedExit();
};

 

ClerkMDlg.cpp

 

// ClerkMDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "Library.h"
#include "ClerkMDlg.h"
#include "afxdialogex.h"
#include "MainFrm.h"

// CClerkMDlg 对话框

IMPLEMENT_DYNAMIC(CClerkMDlg, CDialog)

CClerkMDlg::CClerkMDlg(CWnd* pParent /*=NULL*/)
: CDialog(CClerkMDlg::IDD, pParent)
{
 m_strUserNameQ = _T("");
 m_strUserName = _T("");
 m_strUserIDQ = _T("");
 m_strUserID = _T("");
 m_strPassWord = _T("");
 m_strIDCard = _T("");
 sts=true;
 p=NULL;
 pfirst=NULL;
 plast=NULL;
 pp=NULL;
 //_RecordsetPtr pRst(__uuidof(Recordset));
 //UpdateData(TRUE);
 
}
BOOL CClerkMDlg::OnInitDialog()
{ 
 CWnd *pWnd;
 pWnd = GetDlgItem(IDC_POSITION);
//  ((CComboBox *)pWnd)->AddString("主席");
//  ((CComboBox *)pWnd)->AddString("经理");
//  ((CComboBox *)pWnd)->AddString("主任");
//  ((CComboBox *)pWnd)->AddString("员工");
 ((CComboBox *)pWnd)->InsertString(0,"员工");
 ((CComboBox *)pWnd)->InsertString(1,"经理");
 ((CComboBox *)pWnd)->InsertString(2,"主任");
 ((CComboBox *)pWnd)->InsertString(3,"主席");

 
  /*CoInitialize(NULL);
  _RecordsetPtr pRst(__uuidof(Recordset));
  pRst = ((CMainFrame*)(AfxGetMainWnd()))->pConn->Execute("select 'm_strUserNameQ' from CLERK ",NULL,adCmdText);
  if(pRst->rsEOF)
  { MessageBox(_T("用户名不存在，请重新输入")); }
     pRst->Close();
  pRst.Release();
  CoUninitialize();*/
 
 return TRUE;
}
CClerkMDlg::~CClerkMDlg()
{
 if ( pRst != NULL )

 {

  pRst ->Close( );
  pRst.Release();

 }
 p=NULL;
}

void CClerkMDlg::DoDataExchange(CDataExchange* pDX)
{
 CDialog::DoDataExchange(pDX);
 DDX_Text(pDX,IDC_USERID_Q,m_strUserIDQ);
 DDV_MaxChars(pDX,m_strUserIDQ,8);
 DDX_Text(pDX,IDC_USERID,m_strUserID);
 DDX_Text(pDX,IDC_USERNAME,m_strUserName);
 DDX_Text(pDX,IDC_USERNAME_Q,m_strUserNameQ);
 DDX_Text(pDX,IDC_PASSWORD,m_strPassWord);
 DDX_Text(pDX,IDC_CARDID,m_strIDCard);
}

BEGIN_MESSAGE_MAP(CClerkMDlg, CDialog)
 ON_BN_CLICKED(IDC_FIRST, &CClerkMDlg::OnBnClickedFirst)
 ON_BN_CLICKED(IDC_LAST, &CClerkMDlg::OnBnClickedLast)
 ON_BN_CLICKED(IDC_PRIOR, &CClerkMDlg::OnBnClickedPrior)
 ON_BN_CLICKED(IDC_NEST, &CClerkMDlg::OnBnClickedNest)
 ON_BN_CLICKED(IDC_NEW, &CClerkMDlg::OnBnClickedNew)
 ON_BN_CLICKED(IDC_EDIT, &CClerkMDlg::OnBnClickedEdit)
 ON_BN_CLICKED(IDC_ENQUERY, &CClerkMDlg::OnBnClickedEnquery)
 ON_BN_CLICKED(IDC_DELETE, &CClerkMDlg::OnBnClickedDelete)
 ON_BN_CLICKED(IDC_SAVE, &CClerkMDlg::OnBnClickedSave)
 ON_BN_CLICKED(IDC_CANCEL_REC, &CClerkMDlg::OnBnClickedCancelRec)
 ON_BN_CLICKED(IDC_EXIT, &CClerkMDlg::OnBnClickedExit)
END_MESSAGE_MAP()

// CClerkMDlg 消息处理程序

void CClerkMDlg::OnBnClickedFirst()
{
 // TODO: 在此添加控件通知处理程序代码
 SetTextSate();
 _RecordsetPtr pRst(__uuidof(Recordset));
 pRst->Open("SELECT * FROM CLERK",((CMainFrame*)(AfxGetMainWnd()))->pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdText); 
 pRst->MoveFirst();
 p=pRst;
 DisplayRecord(pRst );
}

void CClerkMDlg::OnBnClickedLast()
{
 // TODO: 在此添加控件通知处理程序代码
 SetTextSate();
 _RecordsetPtr pRst(__uuidof(Recordset));
 pRst->Open("SELECT * FROM CLERK",((CMainFrame*)(AfxGetMainWnd()))->pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdText); 
 pRst->MoveLast();
 p=pRst;
 DisplayRecord(pRst );
}

void CClerkMDlg::OnBnClickedPrior()
{
 // TODO: 在此添加控件通知处理程序代码
 UpdateData(TRUE);
 SetTextSate();
 _RecordsetPtr pRst(__uuidof(Recordset));
 pRst->Open("SELECT * FROM CLERK",((CMainFrame*)(AfxGetMainWnd()))->pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdText); 
 pRst->MoveLast();
 if(p==NULL) p=pRst;
 p->MovePrevious();
 if((p->BOF)==FALSE) DisplayRecord(p);
 else MessageBox("已经是第一条了！");
 UpdateData(FALSE);
}

void CClerkMDlg::OnBnClickedNest()
{
 // TODO: 在此添加控件通知处理程序代码
 UpdateData(TRUE);
 SetTextSate();
 _RecordsetPtr pRst(__uuidof(Recordset));
 pRst->Open("SELECT * FROM CLERK",((CMainFrame*)(AfxGetMainWnd()))->pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdText); 
 pRst->MoveFirst();
 if(p==NULL) p=pRst;
 else p->MoveNext();
 if((p->rsEOF)==FALSE) DisplayRecord(p );
 else MessageBox("已经是最后一条了！");
}

void CClerkMDlg::OnBnClickedNew()
{
 // TODO: 在此添加控件通知处理程序代码
 sts=false;
 SetTextSate();
 pRst.CreateInstance(__uuidof( Recordset ));
 //创建实例
 pRst->Open("SELECT * FROM CLERK",((CMainFrame*)(AfxGetMainWnd()))->pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdText);
 pRst->MoveLast();
 p=pRst;
 m_strUserNameQ = _T("");
 m_strUserName = _T("");
 m_strUserIDQ = _T("");
 m_strUserID = _T("");
 m_strPassWord = _T("");
 m_strIDCard = _T("");
 sts=true;
 
 UpdateData(FALSE);
}

void CClerkMDlg::OnBnClickedDelete()
{
 // TODO: 在此添加控件通知处理程序代码
 SetTextSate();
if((p->rsEOF)==FALSE)
  {  pp=p; 
 pp->Delete(adAffectCurrent); 
 p->Update();
 
 p->MoveNext();
 if((p->rsEOF)==FALSE) DisplayRecord(p );
 else {MessageBox("删除的是最后一条了！");
       p->MovePrevious();
    DisplayRecord(p);
 }}
 else MessageBox("已经是最后一条了");

 UpdateData(FALSE);
}

void CClerkMDlg::OnBnClickedEdit()
{
 // TODO: 在此添加控件通知处理程序代码
 sts=false;
 SetTextSate();
 sts=true;
}

void CClerkMDlg::OnBnClickedEnquery()
{
 // TODO: 在此添加控件通知处理程序代码
 UpdateData(TRUE);
 SetTextSate();
 //CoInitialize(NULL);
 //_RecordsetPtr pRst(__uuidof(Recordset));
 CString mSqlStr;
 mSqlStr="select * from CLERK where NAME='";
 mSqlStr+=m_strUserNameQ;
 mSqlStr+="'";
 pRst = ((CMainFrame*)(AfxGetMainWnd()))->pConn->Execute((_bstr_t)mSqlStr,NULL,adCmdText);
 p=pRst;
 if(pRst->rsEOF)
 {
  m_strUserName = _T("");
  m_strUserIDQ = _T("");
  m_strUserID = _T("");
  m_strPassWord = _T("");
  m_strIDCard = _T("");
  UpdateData(FALSE);
  MessageBox(_T("用户名不存在，请重新输入"));  
 }
 else DisplayRecord(pRst ); 
 //pRst->Close();
 //pRst.Release();
 CoUninitialize();
 UpdateData(FALSE);
}

void CClerkMDlg::OnBnClickedSave()
{
 // TODO: 在此添加控件通知处理程序代码
 UpdateData(TRUE);
 SetTextSate();
 CoInitialize(NULL);
 //_RecordsetPtr pRst(__uuidof(Recordset));  
//       CString mSqlStr;
//         mSqlStr="insert into CLERK values( '";
//         mSqlStr+=m_strUserID;
//         mSqlStr+="','";
//         mSqlStr+=m_strUserName;
//         mSqlStr+="','";
//         mSqlStr+=m_strPassWord;
//         mSqlStr+="','";
//         mSqlStr+=m_strIDCard;
//         mSqlStr+="')";                           
//       pRst=((CMainFrame*)(AfxGetMainWnd()))->pConn->Execute((_bstr_t)mSqlStr,NULL,adCmdText); 
             
 //记录集方法二
 //_RecordsetPtr m_pRecordset;
 pRst.CreateInstance(__uuidof( Recordset ));
 //创建实例
 pRst->Open("SELECT * FROM CLERK",((CMainFrame*)(AfxGetMainWnd()))->pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdText);
 pRst->MoveFirst();
 pfirst=pRst;
    m_strUserNameQQ="";
    BOOL sp=TRUE;
  while((pfirst->rsEOF)==FALSE)           
    {
     m_strUserNameQQ=pfirst->GetCollect("NAME");
     if(m_strUserNameQQ==m_strUserName)
     sp=FALSE;
        pfirst->MoveNext();    
    }
   
  if(sp)
    {
     //p->AddNew(); 本句是在表的末尾增加新纪录
    //pRst->AddNew("NAME",_variant_t(m_strUserName));

        p->PutCollect("CLERK_ID",_variant_t(m_strUserID));
     p->PutCollect("NAME",_variant_t(m_strUserName));
     p->PutCollect("PASSWORD",_variant_t(m_strPassWord));
     p->PutCollect("IDCARD",_variant_t(m_strIDCard));
         
    //更新数据库-将新纪录存入数据库   
     p->Update();    
  }
  else MessageBox("已存在此用户!");
    //pRst->Close();
    //pRst.Release();
    UpdateData(FALSE);
    CoUninitialize();  
}

void CClerkMDlg::OnBnClickedCancelRec()
{
 // TODO: 在此添加控件通知处理程序代码
 m_strUserNameQ = _T("");
 m_strUserName = _T("");
 m_strUserIDQ = _T("");
 m_strUserID = _T("");
 m_strPassWord = _T("");
 m_strIDCard = _T("");
 UpdateData(FALSE);
}

void CClerkMDlg::OnBnClickedExit()
{
 // TODO: 在此添加控件通知处理程序代码
 CDialog::OnCancel();

}
void CClerkMDlg::DisplayRecord(_RecordsetPtr pRst )
{
 m_strUserName=pRst->GetCollect("NAME");
 m_strUserID=pRst->GetCollect("IDCARD");
 m_strPassWord=pRst->GetCollect("PASSWORD");
 m_strIDCard=pRst->GetCollect("CLERK_ID");
 UpdateData(FALSE);
 
}

void CClerkMDlg::SetTextSate()
{
 CWnd *pWnd;
 if (sts)
 {
  pWnd=GetDlgItem(IDC_USERNAME);
  pWnd->EnableWindow(FALSE);
  pWnd=GetDlgItem(IDC_USERID);
  pWnd->EnableWindow(FALSE);
  pWnd=GetDlgItem(IDC_PASSWORD);
  pWnd->EnableWindow(FALSE);
  pWnd=GetDlgItem(IDC_CARDID);
  pWnd->EnableWindow(FALSE);
  pWnd=GetDlgItem(IDC_USERNAME_Q);
  pWnd->EnableWindow(TRUE);
  pWnd=GetDlgItem(IDC_USERID_Q);
  pWnd->EnableWindow(TRUE);
  
 }
 else
 {
  pWnd=GetDlgItem(IDC_USERNAME);
  pWnd->EnableWindow(TRUE);
  pWnd=GetDlgItem(IDC_USERID);
  pWnd->EnableWindow(TRUE);
  pWnd=GetDlgItem(IDC_PASSWORD);
  pWnd->EnableWindow(TRUE);
  pWnd=GetDlgItem(IDC_CARDID);
  pWnd->EnableWindow(TRUE);
  pWnd=GetDlgItem(IDC_USERNAME_Q);
  pWnd->EnableWindow(FALSE);
  pWnd=GetDlgItem(IDC_USERID_Q);
  pWnd->EnableWindow(FALSE);
 }
}