MFC ADO使用

MFC ADO使用

1.导入ADO链接库

#import "C:/Program Files/Common Files/System/ado/msado15.dll"no_namespace rename("EOF", "adoEOF")rename("BOF", "adoBOF") //两行写一行，写在stdafx.h文件末尾 。C为系统盘。

 

2.ADO封装

工程中引入以下两文件。

 //ADO.h
 #pragma once

 class ADO
 {
  public:
      ADO(void);
     ~ADO(void);
     void OnInitADOConn(void);
     void CloseRecordset(void);
     void CloseConn(void);
     UINT GetRecordCount(_RecordsetPtr pRecordset);
  public:
     _ConnectionPtr m_pConnection;
     _RecordsetPtr m_pRecordset;
     _RecordsetPtr& OpenRecordset(CString sql);
  };

 //ADO.cpp
 #include "StdAfx.h"
 #include "ADO.h"
 ADO::ADO(void)
 {
 }
 ADO::~ADO(void)
 {
 }
 void ADO::OnInitADOConn(void)
 {

      ::CoInitialize(NULL);
      try
      {
         m_pConnection.CreateInstance("ADODB.Connection");
         _bstr_tstrConnect = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = Media.mdb";      //data source后添数据库文件相对路径或绝对路径均可。
             m_pConnection->Open(strConnect,"","",adModeUnknown);
      }

      catch(_com_errort)
      {
         AfxMessageBox(t.Description());
      }
 }


 _RecordsetPtr& ADO::OpenRecordset(CString sql)
 {
      //TODO: insertreturn statement here
      ASSERT(!sql.IsEmpty());
      try
      {
          m_pRecordset.CreateInstance(__uuidof(Recordset));
          m_pRecordset->Open(_bstr_t(sql), m_pConnection.GetInterfacePtr(),adOpenDynamic, adLockOptimistic, adCmdText);
      }
      catch(_com_errort)
      {
          AfxMessageBox(t.Description());
      }
      returnm_pRecordset;
 }
 void ADO::CloseRecordset(void)
 {
     if(m_pRecordset->GetState() == adStateOpen)
         m_pRecordset->Close();
 }
 void ADO::CloseConn(void)
 {
      m_pConnection->Close();
      ::CoUninitialize();
 }
 UINT ADO::GetRecordCount(_RecordsetPtr pRecordset)
 {
      int count = 0;
      try
      {
         pRecordset->MoveFirst();
      }
      catch(...)
      {
         return 0;
      }

      if(pRecordset->adoEOF)
         return 0;
      while(!pRecordset->adoEOF)
      {
         pRecordset->MoveNext();
         count = count +1;
      }
      pRecordset->MoveFirst();
      return count;
 }

3.使用案例

1.创建连接实例并打开记录集 

 ADO m_ado;
 m_ado.OnInitADOConn();
 CString sql ="select * from MediaInfo order by id desc";
 m_ado.m_pRecordset= m_ado.OpenRecordset(sql);

 2.读入数据操作view plai

 ADO m_ado;
 m_ado.OnInitADOConn();
 CString sql = "select * from MediaInfo  order by id ";
 m_ado.m_pRecordset = m_ado.OpenRecordset(sql);
 while (!m_ado.m_pRecordset->adoEOF)
 {
     m_show.InsertItem(0,"");
     m_show.SetItemText(0,0,(char*)(_bstr_t)m_ado.m_pRecordset->GetCollect("id"));
     m_show.SetItemText(0,1,(char*)(_bstr_t)m_ado.m_pRecordset->GetCollect("mediaName"));
     m_show.SetItemText(0,2,(char*)(_bstr_t)m_ado.m_pRecordset->GetCollect("mediaPath"));
     m_ado.m_pRecordset->MoveNext();
 }
 m_ado.CloseRecordset();
 m_ado.CloseConn();

3.向数据库中添加数据

 m_ado.m_pRecordset->AddNew();
 m_ado.m_pRecordset->PutCollect("mediaName ",(_bstr_t)m_ mediaName);
 m_ado.m_pRecordset->PutCollect("mediaPath ",(_bstr_t)m_ mediaPath);
 m_ado.m_pRecordset->Update();

4.修改数据

 m_ado.m_pRecordset->Move((long)position, vtMissing);
 m_ado.m_pRecordset->PutCollect("id",(_bstr_t)m_id);

5.删除一条记录

 m_ado.m_pRecordset->Move(position, vtMissing);
 m_ado.m_pRecordset->Delete(adAffectCurrent);