adoconn.cpp

C++应用编程20例,各种小程序原代码都有

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

#include "stdafx.h"
#include "Classsystem.h"
#include "ADOConn.h"

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

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

ADOConn::ADOConn()
{

}
void ADOConn::OnInitADOConn()
{
	::CoInitialize(NULL);
	try
	{
		m_pConnection.CreateInstance("ADODB.connection");
		_bstr_t strConnect="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=xscj.mdb;Persist Security Info=False;";
		m_pConnection->Open(strConnect,"","",adModeUnknown);
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
	}
}
_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)
{
	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();
}

ADOConn::~ADOConn()
{

}