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libpqxx sample

pqxx.cpp
/*
 * pqxx.cpp
 *
 * Author, Copyright: Oleg Borodin <onborodin@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 *
 */
 
#include <iostream>
#include <pqxx/pqxx>
 
int main(int, char *argv[]) {
 
    try {
        pqxx::connection conn("host=localhost dbname=lorem user=pgsql");
        pqxx::work txn(conn);
 
        pqxx::result res = txn.exec("select id, name, password from users order by id");
        std::cout << "# res size " << res.size() << "\n";
 
        for (auto row: res) {
            for (auto field: row) {
                std::cout << field.c_str() << "\t";
            }
            std::cout << std::endl;
        }
    }
    catch (const pqxx::sql_error &e) {
        std::cerr << "# sql error: " << e.what() << std::endl;
        std::cerr << "# query was: " << e.query() << std::endl;
        return 2;
    }
    catch (const std::exception &e) {
        std::cerr << "# error: " << e.what() << std::endl;
        return 1;
    }
}

Out

$ sudo ./pgxx
# res size 9
1	qwerty	12345	
2	nklokko	12345	
3	rosetta	12345	
4	user2	        12345	
5	skyekr	12345	
6	kirluke	12345	
7	koeplin	12345	
8	mhowe	12345	
12	qwerty1	12345