Re: Getting to learn libpqxx

Ok... some stupid questions:

1. I take it pqxx/connection.h is in the include path?
2. If so, what command are you using to compile the source?

Also, your connection string is not built correctly, 'connstring' is not a
class, thus it doesn't support any overloaded operators such as '<<' & '+'
etc.

Do some thing like this:

#include <sstream>

std::stringstream connstring;

connstring << "host=" << host << "database=" << dbase << "username=" <<
uname << "password=" << passwd;

// call connection constructor something like this:
Connection *db = new Connection(connstring.str().c_str());

Etc.. etc.. also, as 'bool Immediate' defaults to 'true' you don't have to
specify it.

Regards,
-Matt

-----Original Message-----
From: pgsql-interfaces-owner(at)postgresql(dot)org
[mailto:pgsql-interfaces-owner(at)postgresql(dot)org] On Behalf Of Michiel Lange
Sent: Thursday, 10 April 2003 8:31 AM
To: pgsql-interfaces(at)postgresql(dot)org
Subject: [INTERFACES] Getting to learn libpqxx

Hello everybody again,

I went out to investigate and try if I could master libpqxx, for libpq++
works not at all. Seeing it is discontinued, and people are encouraged to
use libpqxx, I was so bold as to try that ;-)

Only to discover that there is hardly any documentation on how to access
stuff... now I, myself am more a C-programmer, and I know C++ is pretty
much different... it is really hard for me to think in classes and stuff,
to think object-oriented...

So, now you know I am an earthling :P

I tried this kind of approach, the idea was to start out simple... so don't
laugh at the attempt ...

#include <pqxx/connection.h>

int main(int argc, char *argv[])
{
Connection *db;
char uname[250]; // username
char passwd[250]; // password
char host[250]; //hostname
char passwd[250]; //password
char dbase[250]; //database name
char connstring[1264];
... some output and input to get values for all these char arrays...

connstring = "host=" >> host >> "database=" >> dbase >> "username="
>>
uname >> "password=" >> passwd;
db = new Connection(connstring,true);

if(db->is_open())
{
cout << "Connection succesful!" << endl;
cout << db->Options();
}
else
{
cout << "Something went wrong... oops" << endl;
}
delete db;
return 0;
}

I get my first errors at "Connection *db" declaration... there is no
Connection defined...
Can anyone point out how to reference the classes libpqxx has?

Also I was curious if my connstring was correctly built, but that is
another subject I think... One other very important thing would be: how can
I find out the error PostgreSQL will throw at me when I did something ugly?
At least I can find out the problem, when I make one then...

Michiel

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