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

}