简单的VC++ ADO帮助类

首先看头文件

#pragma once
#import "c:\Program Files\Common Files\System\ado\msado15.dll" no_namespace rename("EOF","adoEOF") rename("BOF","adoBOF")

#if !defined(AFX_ADOCONN_H__75D447E2_EABB_4A14_9762_DD826E28D19A__INCLUDED_)
#define AFX_ADOCONN_H__75D447E2_EABB_4A14_9762_DD826E28D19A__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CAdoConn
{
public:
    _ConnectionPtr m_pConnection;
    _RecordsetPtr m_pRecordset;

public:
    CAdoConn(void);
    virtual ~CAdoConn(void);
    void OnInitADOConn();                            // 初始化—连接数据库
    _RecordsetPtr& GetRecordSet(CString bstrSQL);    // 执行查询
    BOOL ExecuteSQL(CString bstrSQL);                // 执行SQL语句，Insert Update _variant_t
    void ExitConnect();        
};

#endif 

下面是实现

#include "stdafx.h"
#include "AdoConn.h"


CAdoConn::CAdoConn(void)
{
}


CAdoConn::~CAdoConn(void)
{
}

void CAdoConn::OnInitADOConn()
{
    ::CoInitialize(NULL);

    try
    {
        m_pConnection.CreateInstance("ADODB.Connection");
        _bstr_t strConnect = "Provider=SQLOLEDB.1; Server=(local); Database=LibraryManageSys; user id=sa;password=root;";
        m_pConnection->Open(strConnect,"","",adModeUnknown);
    }
    catch(_com_error e)
    {
        AfxMessageBox(e.Description());
    }
}

_RecordsetPtr& CAdoConn::GetRecordSet(CString bstrSQL)
{
    try
    {
        if(m_pConnection==NULL)
            OnInitADOConn();
        m_pRecordset.CreateInstance(__uuidof(Recordset));
        m_pRecordset->Open((_bstr_t)bstrSQL,m_pConnection.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
    }
    catch(_com_error e)
    {
        AfxMessageBox(e.Description());
    }
    return this->m_pRecordset;
}

BOOL CAdoConn::ExecuteSQL(CString bstrSQL)
{
    try
    {
        if(m_pConnection == NULL)
            OnInitADOConn();
        m_pConnection->Execute((_bstr_t)bstrSQL,NULL,adCmdText);
        return TRUE;
    }
    catch(_com_error e)
    {
        AfxMessageBox(e.Description());
        return FALSE;
    }
}

void CAdoConn::ExitConnect()
{
    if (m_pRecordset != NULL)
        m_pRecordset->Close();
    m_pConnection->Close();

    ::CoUninitialize();
}

把组件的初始化和取消初始化功能都集中在这个类中，屏蔽掉数据库使用的一些细节，当然功能很简单也就能实现各简单的增删改查，不过对于做一些小型应用来说帮助还是很大的。