1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/***********************************************************************
transaction.cpp - Example showing how to use MySQL++'s transaction
features.
Copyright (c) 1998 by Kevin Atkinson, (c) 1999-2001 by MySQL AB, and
(c) 2004-2009 by Educational Technology Resources, Inc. Others may
also hold copyrights on code in this file. See the CREDITS.txt 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 "cmdline.h"
#include "printdata.h"
#include "stock.h"
#include <iostream>
#include <cstdio>
using namespace std;
int
main(int argc, char *argv[])
{
// Get database access parameters from command line
mysqlpp::examples::CommandLine cmdline(argc, argv);
if (!cmdline) {
return 1;
}
try {
// Establish the connection to the database server.
mysqlpp::Connection con(mysqlpp::examples::db_name,
cmdline.server(), cmdline.user(), cmdline.pass());
// Show initial state
mysqlpp::Query query = con.query();
cout << "Initial state of stock table:" << endl;
print_stock_table(query);
// Insert a few rows in a single transaction set
{
// Use a higher level of transaction isolation than MySQL
// offers by default. This trades some speed for more
// predictable behavior. We've set it to affect all
// transactions started through this DB server connection,
// so it affects the next block, too, even if we don't
// commit this one.
mysqlpp::Transaction trans(con,
mysqlpp::Transaction::serializable,
mysqlpp::Transaction::session);
stock row("Sauerkraut", 42, 1.2, 0.75,
mysqlpp::sql_date("2006-03-06"), mysqlpp::null);
query.insert(row);
query.execute();
cout << "\nRow inserted, but not committed." << endl;
cout << "Verify this with another program (e.g. simple1), "
"then hit Enter." << endl;
getchar();
cout << "\nCommitting transaction gives us:" << endl;
trans.commit();
print_stock_table(query);
}
// Now let's test auto-rollback
{
// Start a new transaction, keeping the same isolation level
// we set above, since it was set to affect the session.
mysqlpp::Transaction trans(con);
cout << "\nNow adding catsup to the database..." << endl;
stock row("Catsup", 3, 3.9, 2.99,
mysqlpp::sql_date("2006-03-06"), mysqlpp::null);
query.insert(row);
query.execute();
}
cout << "\nNo, yuck! We don't like catsup. Rolling it back:" <<
endl;
print_stock_table(query);
}
catch (const mysqlpp::BadQuery& er) {
// Handle any query errors
cerr << "Query error: " << er.what() << endl;
return -1;
}
catch (const mysqlpp::BadConversion& er) {
// Handle bad conversions
cerr << "Conversion error: " << er.what() << endl <<
"\tretrieved data size: " << er.retrieved <<
", actual size: " << er.actual_size << endl;
return -1;
}
catch (const mysqlpp::Exception& er) {
// Catch-all for any other MySQL++ exceptions
cerr << "Error: " << er.what() << endl;
return -1;
}
return 0;
}
|
