libtabula

Artifact Content
Login

Artifact 65e699ab3cd51b09835ecf7dc934a9ea48abea6c:


/***********************************************************************
 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 © 2005-2009 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 libtabula.

 libtabula 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.

 libtabula 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 libtabula; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
 USA
***********************************************************************/

#include "cmdline.h"
#include "printdata.h"

#include <libtabula.h>

#include <iostream>
#include <iomanip>

using namespace std;

int
main(int argc, char *argv[])
{
	// Get database access parameters from command line
	libtabula::examples::CommandLine cmdline(argc, argv);
	if (!cmdline) {
		return 1;
	}

	// Connect to the sample database.
	libtabula::Connection conn(false);
	if (conn.connect(libtabula::examples::db_name, cmdline.server(),
			cmdline.user(), cmdline.pass())) {
		// Ask for all rows from the sample stock table and display
		// them.  Unlike simple2 example, we retreive each row one at
		// a time instead of storing the entire result set in memory
		// and then iterating over it.
		libtabula::Query query = conn.query("select * from stock");
		if (libtabula::UseQueryResult res = query.use()) {
			// Display header
			cout.setf(ios::left);
			cout << setw(31) << "Item" <<
					setw(10) << "Num" <<
					setw(10) << "Weight" <<
					setw(10) << "Price" <<
					"Date" << endl << endl;

			// Get each row in result set, and print its contents
			while (libtabula::Row row = res.fetch_row()) {
				cout << setw(30) << row["item"] << ' ' <<
						setw(9) << row["num"] << ' ' <<
						setw(9) << row["weight"] << ' ' <<
						setw(9) << row["price"] << ' ' <<
						setw(9) << row["sdate"] <<
						endl;
			}

			// Check for error: can't distinguish "end of results" and
			// error cases in return from fetch_row() otherwise.
			if (conn.errnum()) {
				cerr << "Error received in fetching a row: " <<
						conn.error() << endl;
				return 1;
			}
			return 0;
		}
		else {
			cerr << "Failed to get stock item: " << query.error() << endl;
			return 1;
		}
	}
	else {
		cerr << "DB connection failed: " << conn.error() << endl;
		return 1;
	}
}