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