实现CADOConn类的关闭数据库连接函数:void CloseConn()

void  CADOConn::CloseConn()
{
     if(m_pConnection->GetState()==adStateOpen)       //判断当前连接对象指针的状态是否为打开状态
        {
              m_pConnection->Close();                          //关闭连接
        }
     ::CoUninitialize();                                             //释放COM环境
}