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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
// file : boost/driver.cxx
// author : Boris Kolpackov <boris@codesynthesis.com>
// copyright : not copyrighted - public domain
#include <memory> // std::auto_ptr
#include <iostream>
#include <odb/database.hxx>
#include <odb/session.hxx>
#include <odb/transaction.hxx>
#include "database.hxx" // create_database
#include "employee.hxx"
#include "employee-odb.hxx"
using namespace std;
using namespace boost::gregorian;
using namespace odb::core;
int
main (int argc, char* argv[])
{
try
{
auto_ptr<database> db (create_database (argc, argv));
// Create a few persistent objects.
//
{
// Simple Tech Ltd.
//
{
shared_ptr<employer> er (new employer ("Simple Tech Ltd"));
shared_ptr<employee> john (
new employee ("John", "Doe", date (1975, Jan, 1), er));
shared_ptr<employee> jane (
new employee ("Jane", "Doe", date (1976, Feb, 2), er));
john->emails ().insert ("john_d@example.com");
john->emails ().insert ("john.doe@example.com");
jane->emails ().insert ("jane_s@example.com");
jane->emails ().insert ("jane.smith@example.com");
// Set the inverse side of the employee-employer relationship.
//
er->employees ().push_back (john);
er->employees ().push_back (jane);
transaction t (db->begin ());
db->persist (er);
db->persist (john);
db->persist (jane);
t.commit ();
}
// Complex Systems Inc.
//
{
shared_ptr<employer> er (new employer ("Complex Systems Inc"));
shared_ptr<employee> john (
new employee ("John", "Smith", date (1977, Mar, 3), er));
shared_ptr<employee> jane (
new employee ("Jane", "Smith", date (1978, Apr, 4), er));
john->emails ().insert ("john_s@example.com");
john->emails ().insert ("john.smith@example.com");
jane->emails ().insert ("jane_s@example.com");
jane->emails ().insert ("jane.smith@example.com");
// Set the inverse side of the employee-employer relationship.
//
er->employees ().push_back (john);
er->employees ().push_back (jane);
transaction t (db->begin ());
db->persist (er);
db->persist (john);
db->persist (jane);
t.commit ();
}
}
// Load Simple Tech Ltd and print its employees.
//
{
session s;
transaction t (db->begin ());
shared_ptr<employer> stl (db->load<employer> ("Simple Tech Ltd"));
employees& es (stl->employees ());
for (employees::iterator i (es.begin ()); i != es.end (); ++i)
{
lazy_weak_ptr<employee>& lwp (*i);
shared_ptr<employee> p (lwp.load ()); // Load and lock.
cout << p->first () << " " << p->last () << endl
<< " born: " << p->born () << endl
<< " employer: " << p->employer ()->name () << endl;
for (emails::const_iterator j (p->emails ().begin ());
j != p->emails ().end (); ++j)
{
cout << " email: " << *j << endl;
}
cout << endl;
}
t.commit ();
}
// Search for Complex Systems Inc employees that were born before
// April 1978.
//
{
typedef odb::query<employee> query;
typedef odb::result<employee> result;
session s;
transaction t (db->begin ());
result r (db->query<employee> (
query::employer::name == "Complex Systems Inc" &&
query::born < date (1978, Apr, 1)));
for (result::iterator i (r.begin ()); i != r.end (); ++i)
cout << i->first () << " " << i->last () << " " << i->born () << endl;
t.commit ();
}
}
catch (const odb::exception& e)
{
cerr << e.what () << endl;
return 1;
}
}
|
