-
Notifications
You must be signed in to change notification settings - Fork 19
/
modify.cpp
108 lines (92 loc) · 3.28 KB
/
modify.cpp
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
/*
* Copyright (C) 2014 Tommi Maekitalo
*
* This library 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.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
This demonstrates how to modify data in a database with tntdb.
*/
#include <iostream>
#include <cxxtools/log.h>
#include <tntdb/connect.h>
#include <tntdb/pscconnection.h>
#include <tntdb/statement.h>
#include <tntdb/transaction.h>
int main(int argc, char* argv[])
{
try
{
log_init(); // logging should be initialized always
if (argc < 2)
{
std::cerr << "Usage: " << argv[0] << " dburl" << std::endl;
return -1;
}
const std::string database = argv[1];
tntdb::PSCConnection db = tntdb::connect(database);
// insert
tntdb::Statement ins = db.prepare("insert into foo(a, b)"
" values (:a, :b)");
ins.set("a", 42)
.set("b", "Hi there")
.execute();
// update
tntdb::Statement upd = db.prepare("update foo"
" set b = :b"
" where a = :a");
upd.set("a", 42)
.set("b", "Hello")
.execute();
// delete
tntdb::Statement del = db.prepare("delete from foo"
" where a = :a");
upd.set("a", 42)
.execute();
// using a transaction
{
// We define the transaction object in a scope.
//
// The transaction will be rolled back automatically in case the
// end of the block is reached and no commit or rollback is called.
// This happens typically when a exception is thrown.
//
// Note that when the rollback fails in the destructor errors are lost.
tntdb::Transaction transaction(db);
tntdb::Statement ins = db.prepare("insert into foo(a, b)"
" values (:a, :b)");
ins.set("a", 42)
.set("b", "Hi there")
.execute();
ins.set("a", 43)
.set("b", "Hello")
.execute();
transaction.commit();
}
}
catch (const std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}