Hello, I am having trouble using libpqxx's connection. It may be a 
misunderstanding on my part.

I want a persistent connection, a connection to postgresql database 
server I can use throughout the lifetime of my program. As we know, 
connecting and disconnecting from a server can be expensive. It seems I 
simply cann't do this with libpqxx. For example,

#include <pqxx/pqxx>
class mydbh{
  private:
    pqxx::connection c;
  public:
    mydbh(){
         c = pqxx::connection("");
    }
};

I simply can't compile this code due to connection class design 
decision. Is there a workaround of this problem? Or am I missing 
something completely?

Thanks,
Fei
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