ZeroTierOne/ext/libpqxx-7.7.3/test/test46.cxx

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2022-06-23 17:24:33 +00:00
#include <cmath>
#include <iostream>
#include <sstream>
#include <pqxx/transaction>
#include "test_helpers.hxx"
using namespace pqxx;
// Streams test program for libpqxx. Insert a result field into various
// types of streams.
namespace
{
void test_046()
{
connection conn;
work tx{conn};
row R{tx.exec1("SELECT count(*) FROM pg_tables")};
// Read the value into a stringstream.
std::stringstream I;
I << R[0];
// Now convert the stringstream into a numeric type
long L{}, L2{};
I >> L;
R[0].to(L2);
PQXX_CHECK_EQUAL(L, L2, "Inconsistency between conversion methods.");
float F{}, F2{};
std::stringstream I2;
I2 << R[0];
I2 >> F;
R[0].to(F2);
PQXX_CHECK_BOUNDS(F2, F - 0.01, F + 0.01, "Bad floating-point result.");
auto F3{from_string<float>(R[0].c_str())};
PQXX_CHECK_BOUNDS(F3, F - 0.01, F + 0.01, "Bad float from from_string.");
auto D{from_string<double>(R[0].c_str())};
PQXX_CHECK_BOUNDS(D, F - 0.01, F + 0.01, "Bad double from from_string.");
auto LD{from_string<long double>(R[0].c_str())};
PQXX_CHECK_BOUNDS(
LD, F - 0.01, F + 0.01, "Bad long double from from_string.");
auto S{from_string<std::string>(R[0].c_str())},
S2{from_string<std::string>(std::string{R[0].c_str()})},
S3{from_string<std::string>(R[0])};
PQXX_CHECK_EQUAL(
S2, S,
"from_string(char const[], std::string &) "
"is inconsistent with "
"from_string(std::string const &, std::string &).");
PQXX_CHECK_EQUAL(
S3, S2,
"from_string(result::field const &, std::string &) "
"is inconsistent with "
"from_string(std::string const &, std::string &).");
PQXX_CHECK(tx.query_value<bool>("SELECT 1=1"), "1=1 doesn't yield 'true.'");
PQXX_CHECK(not tx.query_value<bool>("SELECT 2+2=5"), "2+2=5 yields 'true.'");
}
PQXX_REGISTER_TEST(test_046);
} // namespace