probleme execution du tutorial mysql++
Salut, j'ai installé mysql++ sur ma machine (ubuntu 7.04) et j'ai essayer à plusieurs de faire tourner les exemples du tutorial fourni avec mysql++.
là aucun problème à la compilation, mais lors de l'exécution il y des problèmes au moment de l'affichage des valeurs récupérées dans la base, il en résulte un core dumped seg fault.
C'est quand même super étonnant étatn donné qu'il s'agit du tuto officiel fourni avec la librairie et ce problème se répete sur tout les exemples du tuto.
je transmet le code du tuto auquel j'ai ajouté 3 lignes afin de faire des affichages avant/durant/après la boucle de parcours des résultats.
le programme plante juste après l'affichage du premier résultat.
je mets le code et la sortie obtenue. perso j'y comprend vraiment rien donc j'attends vos avis. merci
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| /***********************************************************************
simple3.cpp - Example showing how to use the 'use' method of retrieving
a table, as opposed to the more common 'store' method illustrated
by the simple2 example.
Copyright (c) 2005 by Educational Technology Resources, Inc.
Others may also hold copyrights on code in this file. See the CREDITS
file in the top directory of the distribution for details.
This file is part of MySQL++.
MySQL++ is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
MySQL++ 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with MySQL++; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA
***********************************************************************/
#include "util.h"
#include <mysql++.h>
#include <iostream>
#include <iomanip>
using namespace std;
int
main(int argc, char *argv[])
{
// Connect to the sample database.
mysqlpp::Connection con(false);
if (!connect_to_db(argc, argv, con)) {
return 1;
}
// Ask for all rows from the sample stock table set up by resetdb.
// Unlike simple2 example, we don't store result set in memory.
mysqlpp::Query query = con.query();
query << "select * from stock";
mysqlpp::ResUse res = query.use();
// Retreive result rows one by one, and display them.
if (res) {
// Display header
cout.setf(ios::left);
cout << setw(21) << "Item" <<
setw(10) << "Num" <<
setw(10) << "Weight" <<
setw(10) << "Price" <<
"Date" << endl << endl;
// Get each row in result set, and print its contents
mysqlpp::Row row;
cout << endl << "----test1----" <<endl <<flush;
while (row = res.fetch_row()) {
cout << setw(20) << row["item"] << ' ' <<
setw(9) << row["num"] << ' ' <<
setw(9) << row["weight"] << ' ' <<
setw(9) << row["price"] << ' ' <<
setw(9) << row["sdate"] <<
endl;
cout << endl << "----test2----" <<endl<<flush;
}
cout << endl << "----test3----" <<endl<<flush;
return 0;
}
else {
cerr << "Failed to get stock item: " << query.error() << endl;
return 1;
}
} |
et l'affichage
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| ~/Desktop/mysql++-2.3.2$ simple3
Item Num Weight Price Date
----test1----
Nürnberger Brats 97 1.5 8.79 2005-03-10
Erreur de segmentation (core dumped) |
