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
|
#include <cmath>
#include <iostream>
#include <sstream>
#include "test_helpers.hxx"
using namespace PGSTD;
using namespace pqxx;
// Streams test program for libpqxx. Insert a result field into various
// types of streams.
namespace
{
void test_046(transaction_base &T)
{
result R( T.exec("SELECT count(*) FROM pg_tables") );
cout << "Count was " << R.at(0).at(0) << endl;
// Read the value into a stringstream
stringstream I;
I << R[0][0];
// Now convert the stringstream into a numeric type
long L, L2;
I >> L;
cout << "As a long, it's " << L << endl;
R[0][0].to(L2);
PQXX_CHECK_EQUAL(L, L2, "Inconsistency between conversion methods.");
float F, F2;
stringstream I2;
I2 << R[0][0];
I2 >> F;
cout << "As a float, it's " << F << endl;
R[0][0].to(F2);
PQXX_CHECK_BOUNDS(F2, F-0.01, F+0.01, "Bad floating-point result.");
float F3;
from_string(R[0][0].c_str(), F3);
PQXX_CHECK_BOUNDS(F3, F-0.01, F+0.01, "Bad float from from_string.");
double D;
from_string(R[0][0].c_str(), D);
PQXX_CHECK_BOUNDS(D, F-0.01, F+0.01, "Bad double from from_string.");
#if defined(PQXX_HAVE_LONG_DOUBLE)
long double LD;
from_string(R[0][0].c_str(), LD);
PQXX_CHECK_BOUNDS(LD, F-0.01, F+0.01, "Bad long double from from_string.");
#endif
string S, S2, S3;
from_string(R[0][0].c_str(), S);
from_string(string(R[0][0].c_str()), S2);
from_string(R[0][0], S3);
PQXX_CHECK_EQUAL(
S2,
S,
"from_string(const char[], std::string &) "
"is inconsistent with "
"from_string(const std::string &, std::string &).");
PQXX_CHECK_EQUAL(
S3,
S2,
"from_string(const result::field &, std::string &) "
"is inconsistent with "
"from _string(const std::string &, std::string &).");
PQXX_CHECK(
T.exec("SELECT 1=1").at(0).at(0).as<bool>(),
"1=1 doesn't yield 'true.'");
PQXX_CHECK(
!T.exec("SELECT 2+2=5").at(0).at(0).as<bool>(),
"2+2=5 yields 'true.'");
}
} // namespace
PQXX_REGISTER_TEST(test_046)
|
