请高手帮忙注释下面的代码，我是没有搞明白，下面的代码使用什么方法连接到Sql数据库。代码如下：

//很有意思 是Login.ini，编译时要注意是否存在，不存在时程序出错

//

void CBookManageApp::IniAdo()

{

try

{

CString temp;

char filepath[MAX_PATH];

GetModuleFileName(NULL,filepath,MAX_PATH);

//

temp = theApp.ExtractFilePath(filepath);

//m_pCon.CreateInstance("ADODB.Connection");

CString strAdoConn;

char temp1[100];

//

GetPrivateProfileString("DatabaseConfig","Server","",temp1,100,temp+"login.ini");

strserver = (TCHAR *)temp1;

GetPrivateProfileString("DatabaseConfig","Database","",temp1,100,temp+"login.ini");

strdbName = temp1;

GetPrivateProfileString("DatabaseConfig","User","",temp1,100,temp+"login.ini");

strUser = temp1;

GetPrivateProfileString("DatabaseConfig","PWD","",temp1,100,temp+"login.ini");

strPassword = temp1;

strAdoConn.Format("driver={SQL Server};SERVER=%s;UID=%s;PWD=%s;DATABASE=%s",strserver, strUser, strPassword, strdbName);

//

m_pCon.CreateInstance(_uuidof(Connection));

m_pCon->ConnectionString=(_bstr_t)strAdoConn;

m_pCon->Open("","","",NULL);

m_pCom.CreateInstance("ADODB.Command");

//

m_pRs.CreateInstance(_uuidof(Recordset));

m_pRs1.CreateInstance(_uuidof(Recordset));

}

catch(_com_error)

{

Flag = FALSE;

MessageBox(0,"请检查系统配置信息", "数据库连接失败",MB_OK);

return;

}

catch(...)

{

AfxMessageBox("SYS Error");

return;

}

}