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86 lines
3.1 KiB
C++
86 lines
3.1 KiB
C++
#include <pqxx/cursor>
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#include <pqxx/transaction>
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#include "../test_helpers.hxx"
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namespace
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{
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void test_stateless_cursor()
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{
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pqxx::connection conn;
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pqxx::work tx{conn};
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pqxx::stateless_cursor<
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pqxx::cursor_base::read_only, pqxx::cursor_base::owned>
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empty(tx, "SELECT generate_series(0, -1)", "empty", false);
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auto rows{empty.retrieve(0, 0)};
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PQXX_CHECK_EQUAL(std::empty(rows), true, "Empty result not empty");
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rows = empty.retrieve(0, 1);
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PQXX_CHECK_EQUAL(std::size(rows), 0, "Empty result returned rows");
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PQXX_CHECK_EQUAL(empty.size(), 0, "Empty cursor not empty");
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PQXX_CHECK_THROWS(
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empty.retrieve(1, 0), std::out_of_range, "Empty cursor tries to retrieve");
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pqxx::stateless_cursor<
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pqxx::cursor_base::read_only, pqxx::cursor_base::owned>
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stateless(tx, "SELECT generate_series(0, 9)", "stateless", false);
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PQXX_CHECK_EQUAL(stateless.size(), 10, "stateless_cursor::size() mismatch");
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// Retrieve nothing.
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rows = stateless.retrieve(1, 1);
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PQXX_CHECK_EQUAL(std::size(rows), 0, "1-to-1 retrieval not empty");
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// Retrieve two rows.
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rows = stateless.retrieve(1, 3);
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PQXX_CHECK_EQUAL(std::size(rows), 2, "Retrieved wrong number of rows");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 1, "Data/position mismatch");
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PQXX_CHECK_EQUAL(rows[1][0].as<int>(), 2, "Data/position mismatch");
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// Retrieve same rows in reverse.
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rows = stateless.retrieve(2, 0);
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PQXX_CHECK_EQUAL(std::size(rows), 2, "Retrieved wrong number of rows");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 2, "Data/position mismatch");
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PQXX_CHECK_EQUAL(rows[1][0].as<int>(), 1, "Data/position mismatch");
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// Retrieve beyond end.
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rows = stateless.retrieve(9, 13);
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PQXX_CHECK_EQUAL(std::size(rows), 1, "Row count wrong at end");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 9, "Data/pos mismatch at end");
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// Retrieve beyond beginning.
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rows = stateless.retrieve(0, -4);
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PQXX_CHECK_EQUAL(std::size(rows), 1, "Row count wrong at beginning");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 0, "Data/pos mismatch at beginning");
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// Retrieve entire result set backwards.
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rows = stateless.retrieve(10, -15);
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PQXX_CHECK_EQUAL(
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std::size(rows), 10, "Reverse complete retrieval is broken");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 9, "Data mismatch");
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PQXX_CHECK_EQUAL(rows[9][0].as<int>(), 0, "Data mismatch");
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// Normal usage pattern: step through result set, 4 rows at a time.
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rows = stateless.retrieve(0, 4);
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PQXX_CHECK_EQUAL(std::size(rows), 4, "Wrong batch size");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 0, "Batch in wrong place");
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PQXX_CHECK_EQUAL(rows[3][0].as<int>(), 3, "Batch in wrong place");
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rows = stateless.retrieve(4, 8);
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PQXX_CHECK_EQUAL(std::size(rows), 4, "Wrong batch size");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 4, "Batch in wrong place");
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PQXX_CHECK_EQUAL(rows[3][0].as<int>(), 7, "Batch in wrong place");
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rows = stateless.retrieve(8, 12);
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PQXX_CHECK_EQUAL(std::size(rows), 2, "Wrong batch size");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 8, "Batch in wrong place");
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PQXX_CHECK_EQUAL(rows[1][0].as<int>(), 9, "Batch in wrong place");
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}
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PQXX_REGISTER_TEST(test_stateless_cursor);
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} // namespace
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