119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
/***********************************************************************
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transaction.cpp - Example showing how to use MySQL++'s transaction
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features.
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Copyright (c) 1998 by Kevin Atkinson, (c) 1999-2001 by MySQL AB, and
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(c) 2004-2009 by Educational Technology Resources, Inc. Others may
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also hold copyrights on code in this file. See the CREDITS.txt file
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in the top directory of the distribution for details.
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This file is part of MySQL++.
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MySQL++ is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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MySQL++ is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with MySQL++; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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***********************************************************************/
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#include "cmdline.h"
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#include "printdata.h"
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#include "stock.h"
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#include <iostream>
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#include <cstdio>
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using namespace std;
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int
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main(int argc, char *argv[])
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{
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// Get database access parameters from command line
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mysqlpp::examples::CommandLine cmdline(argc, argv);
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if (!cmdline) {
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return 1;
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}
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try {
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// Establish the connection to the database server.
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mysqlpp::Connection con(mysqlpp::examples::db_name,
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cmdline.server(), cmdline.user(), cmdline.pass());
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// Show initial state
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mysqlpp::Query query = con.query();
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cout << "Initial state of stock table:" << endl;
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print_stock_table(query);
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// Insert a few rows in a single transaction set
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{
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// Use a higher level of transaction isolation than MySQL
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// offers by default. This trades some speed for more
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// predictable behavior. We've set it to affect all
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// transactions started through this DB server connection,
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// so it affects the next block, too, even if we don't
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// commit this one.
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mysqlpp::Transaction trans(con,
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mysqlpp::Transaction::serializable,
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mysqlpp::Transaction::session);
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stock row("Sauerkraut", 42, 1.2, 0.75,
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mysqlpp::sql_date("2006-03-06"), mysqlpp::null);
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query.insert(row);
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query.execute();
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cout << "\nRow inserted, but not committed." << endl;
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cout << "Verify this with another program (e.g. simple1), "
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"then hit Enter." << endl;
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getchar();
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cout << "\nCommitting transaction gives us:" << endl;
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trans.commit();
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print_stock_table(query);
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}
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// Now let's test auto-rollback
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{
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// Start a new transaction, keeping the same isolation level
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// we set above, since it was set to affect the session.
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mysqlpp::Transaction trans(con);
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cout << "\nNow adding catsup to the database..." << endl;
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stock row("Catsup", 3, 3.9, 2.99,
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mysqlpp::sql_date("2006-03-06"), mysqlpp::null);
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query.insert(row);
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query.execute();
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}
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cout << "\nNo, yuck! We don't like catsup. Rolling it back:" <<
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endl;
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print_stock_table(query);
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}
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catch (const mysqlpp::BadQuery& er) {
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// Handle any query errors
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cerr << "Query error: " << er.what() << endl;
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return -1;
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}
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catch (const mysqlpp::BadConversion& er) {
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// Handle bad conversions
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cerr << "Conversion error: " << er.what() << endl <<
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"\tretrieved data size: " << er.retrieved <<
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", actual size: " << er.actual_size << endl;
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return -1;
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}
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catch (const mysqlpp::Exception& er) {
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// Catch-all for any other MySQL++ exceptions
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cerr << "Error: " << er.what() << endl;
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return -1;
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}
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return 0;
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}
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