adoconn.cpp

基于access数据库的图书馆管理系统

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

#include "stdafx.h"
#include "课程设计.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()
{

}

void ADOConn::OnInitDBConnect()
{
	//初始化OLE/COM库环境
	::CoInitialize(NULL);
    //异常处理
	try
	{
	   CString str = "Provider=SQLOLEDB.1;Password=010956;Persist Security Info=True;User ID=sa;Initial Catalog=library;Data Source=XIA;";
	   m_pConnection.CreateInstance("ADODB.Connection");
       _bstr_t strConnect = str;//"Provider=SQLOLEDB.1;Password=010956;Persist Security Info=True;User ID=sa;Initial Catalog=library;Data Source=XIA;";
       m_pConnection->Open(strConnect,"","",adModeUnknown);
	}
	catch (_com_error e) 
	{
	
		AfxMessageBox(e.ErrorMessage());
	}
}

_RecordsetPtr& ADOConn::GetRecordSet(_bstr_t bstrSQL)
{
	try
	{
	//连接数据库，如果Connection对象为空，则重新建立连接
		if (m_pConnection == NULL)		
			OnInitDBConnect();
			//创建记录集对象
		    m_pRecordset.CreateInstance(_uuidof(Recordset));
			m_pRecordset->Open(bstrSQL,m_pConnection.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
			
		
	}
	catch(_com_error e)
	{
	AfxMessageBox(e.ErrorMessage());
	}
	return m_pRecordset;
}

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

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

   ::CoUninitialize();   // 释放环境
}