DB connection pool. How to pass handle?

I'm new to C++ and I need to create DB connection pool.

Here is the class that I have:

class uudb
{
 public:
  uudb();
  ~uudb();

  sptk::CODBCDatabase handle;
  void connect(std::string login, std::string password, int server,
std::string sessionid);
  void disconnect();
};

uudb::uudb() : handle("DSN=PostgreSQL;UID=serge;PWD=;DATABASE=uu")
{
  cout<<"\nOpening DB ...\n";
  handle.open();
}

uudb::~uudb()
{
  cout<<"\nClosing DB ...\n";
  handle.close();
}

void uudb::connect(string login, string password, int server, string
sessionid)
{

  try {
    CQuery loginQuery(&handle,"select
login(:login,:password,:server)");
    loginQuery.param("login") = login;
    loginQuery.param("password") = password;
    loginQuery.param("server") = server; //
lexical_cast<string>(server);
    loginQuery.exec();
    cout<<"\nConnected\n";
  }
  catch (exception& e) {
    cout<<"\nError: " <<e.what();
  }

}

void uudb::disconnect()
{

  try {
    CQuery logoutQuery(&handle,"select logout()");
    logoutQuery.exec();
    cout<<"\nDisconnected\n";
  }
  catch (exception& e) {
    cout<<"\nError: " <<e.what();
  }

}

I need to pass this handle to other classes, so they can use it to
communicate with DB, but I have no idea how to do it.

Your help is appreciated.