adoconn.cpp

ado封装类,adoconn,用法有具体实例,包括查询数据库,列表显示等

// ADOConn.cpp: implementation of the ADOConn class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "MKJC.h"
#include "ADOConn.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

ADOConn::ADOConn()
{

}

ADOConn::~ADOConn()
{

}

BOOL ADOConn::OnInitADOConn()
{
	::CoInitialize(NULL);
	try
	{
		m_pConnection.CreateInstance("ADODB.Connection");
		_bstr_t strConnect="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=MKJC.mdb";
		m_pConnection->Open(strConnect,"","",adModeUnknown);
	}

	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
		return FALSE;
	}
	
	return TRUE;
}

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

BOOL ADOConn::ExecuteSQL(_bstr_t bstrSQL)
{
	_variant_t RecordsAffected;
	try
	{
        if ( m_pConnection == NULL)
		{
			OnInitADOConn();
		}
		m_pConnection->Execute(bstrSQL,NULL,adCmdText);
		return true;
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
		return false;
	}
}

void ADOConn::ExitConnect()
{
    if(m_pRecordset!=NULL)
	{
		m_pRecordset->Close();
	}

	m_pConnection->Close();

	::CoUninitialize();
}