mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-21 05:53:09 +00:00
271 lines
11 KiB
C++
271 lines
11 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_forward_sql_cursor()
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{
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pqxx::connection conn;
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pqxx::work tx{conn};
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// Plain owned, scoped, forward-only read-only cursor.
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pqxx::internal::sql_cursor forward(
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tx, "SELECT generate_series(1, 4)", "forward",
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pqxx::cursor_base::forward_only, pqxx::cursor_base::read_only,
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pqxx::cursor_base::owned, false);
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PQXX_CHECK_EQUAL(forward.pos(), 0, "Wrong initial position");
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PQXX_CHECK_EQUAL(forward.endpos(), -1, "Wrong initial endpos()");
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auto empty_result{forward.empty_result()};
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PQXX_CHECK_EQUAL(std::size(empty_result), 0, "Empty result not empty");
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auto displacement{0};
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auto one{forward.fetch(1, displacement)};
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PQXX_CHECK_EQUAL(std::size(one), 1, "Fetched wrong number of rows");
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PQXX_CHECK_EQUAL(one[0][0].as<std::string>(), "1", "Unexpected result");
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PQXX_CHECK_EQUAL(displacement, 1, "Wrong displacement");
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PQXX_CHECK_EQUAL(forward.pos(), 1, "In wrong position");
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auto offset{forward.move(1, displacement)};
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PQXX_CHECK_EQUAL(offset, 1, "Unexpected offset from move()");
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PQXX_CHECK_EQUAL(displacement, 1, "Unexpected displacement after move()");
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PQXX_CHECK_EQUAL(forward.pos(), 2, "Wrong position after move()");
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PQXX_CHECK_EQUAL(forward.endpos(), -1, "endpos() unexpectedly set");
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auto row{forward.fetch(0, displacement)};
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PQXX_CHECK_EQUAL(std::size(row), 0, "fetch(0, displacement) returns rows");
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PQXX_CHECK_EQUAL(displacement, 0, "Unexpected displacement after fetch(0)");
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PQXX_CHECK_EQUAL(forward.pos(), 2, "fetch(0, displacement) affected pos()");
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row = forward.fetch(0);
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PQXX_CHECK_EQUAL(std::size(row), 0, "fetch(0) fetched wrong number of rows");
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PQXX_CHECK_EQUAL(forward.pos(), 2, "fetch(0) moved cursor");
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PQXX_CHECK_EQUAL(forward.pos(), 2, "fetch(0) affected pos()");
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offset = forward.move(1);
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PQXX_CHECK_EQUAL(offset, 1, "move(1) returned unexpected value");
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PQXX_CHECK_EQUAL(forward.pos(), 3, "move(1) after fetch(0) broke");
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row = forward.fetch(1);
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PQXX_CHECK_EQUAL(
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std::size(row), 1, "fetch(1) returned wrong number of rows");
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PQXX_CHECK_EQUAL(forward.pos(), 4, "fetch(1) results in bad pos()");
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PQXX_CHECK_EQUAL(row[0][0].as<std::string>(), "4", "pos() is lying");
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empty_result = forward.fetch(1, displacement);
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PQXX_CHECK_EQUAL(std::size(empty_result), 0, "Got rows at end of cursor");
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PQXX_CHECK_EQUAL(forward.pos(), 5, "Not at one-past-end position");
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PQXX_CHECK_EQUAL(forward.endpos(), 5, "Failed to notice end position");
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PQXX_CHECK_EQUAL(displacement, 1, "Wrong displacement at end position");
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offset = forward.move(5, displacement);
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PQXX_CHECK_EQUAL(offset, 0, "move() lied at end of result set");
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PQXX_CHECK_EQUAL(forward.pos(), 5, "pos() is beyond end");
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PQXX_CHECK_EQUAL(forward.endpos(), 5, "endpos() changed after end position");
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PQXX_CHECK_EQUAL(displacement, 0, "Wrong displacement after end position");
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// Move through entire result set at once.
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pqxx::internal::sql_cursor forward2(
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tx, "SELECT generate_series(1, 4)", "forward",
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pqxx::cursor_base::forward_only, pqxx::cursor_base::read_only,
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pqxx::cursor_base::owned, false);
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// Move through entire result set at once.
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offset = forward2.move(pqxx::cursor_base::all(), displacement);
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PQXX_CHECK_EQUAL(offset, 4, "Unexpected number of rows in result set");
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PQXX_CHECK_EQUAL(displacement, 5, "displacement != rows+1");
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PQXX_CHECK_EQUAL(forward2.pos(), 5, "Bad pos() after skipping all rows");
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PQXX_CHECK_EQUAL(forward2.endpos(), 5, "Bad endpos() after skipping");
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pqxx::internal::sql_cursor forward3(
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tx, "SELECT generate_series(1, 4)", "forward",
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pqxx::cursor_base::forward_only, pqxx::cursor_base::read_only,
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pqxx::cursor_base::owned, false);
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// Fetch entire result set at once.
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auto rows{forward3.fetch(pqxx::cursor_base::all(), displacement)};
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PQXX_CHECK_EQUAL(
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std::size(rows), 4, "Unexpected number of rows in result set");
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PQXX_CHECK_EQUAL(displacement, 5, "displacement != rows+1");
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PQXX_CHECK_EQUAL(forward3.pos(), 5, "Bad pos() after fetching all rows");
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PQXX_CHECK_EQUAL(forward3.endpos(), 5, "Bad endpos() after fetching");
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pqxx::internal::sql_cursor forward_empty(
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tx, "SELECT generate_series(0, -1)", "forward_empty",
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pqxx::cursor_base::forward_only, pqxx::cursor_base::read_only,
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pqxx::cursor_base::owned, false);
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offset = forward_empty.move(3, displacement);
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PQXX_CHECK_EQUAL(forward_empty.pos(), 1, "Bad pos() at end of result");
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PQXX_CHECK_EQUAL(forward_empty.endpos(), 1, "Bad endpos() in empty result");
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PQXX_CHECK_EQUAL(displacement, 1, "Bad displacement in empty result");
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PQXX_CHECK_EQUAL(offset, 0, "move() in empty result counted rows");
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}
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void test_scroll_sql_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::internal::sql_cursor scroll(
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tx, "SELECT generate_series(1, 10)", "scroll",
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pqxx::cursor_base::random_access, pqxx::cursor_base::read_only,
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pqxx::cursor_base::owned, false);
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PQXX_CHECK_EQUAL(scroll.pos(), 0, "Scroll cursor's initial pos() is wrong");
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PQXX_CHECK_EQUAL(scroll.endpos(), -1, "New scroll cursor has endpos() set");
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auto rows{scroll.fetch(pqxx::cursor_base::next())};
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PQXX_CHECK_EQUAL(std::size(rows), 1, "Scroll cursor is broken");
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PQXX_CHECK_EQUAL(scroll.pos(), 1, "Scroll cursor's pos() is broken");
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PQXX_CHECK_EQUAL(scroll.endpos(), -1, "endpos() set prematurely");
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// Turn cursor around. This is where we begin to feel SQL cursors'
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// semantics: we pre-decrement, ending up on the position in front of the
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// first row and returning no rows.
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rows = scroll.fetch(pqxx::cursor_base::prior());
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PQXX_CHECK_EQUAL(std::empty(rows), true, "Turning around on fetch() broke");
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PQXX_CHECK_EQUAL(scroll.pos(), 0, "pos() is not back at zero");
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PQXX_CHECK_EQUAL(
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scroll.endpos(), -1, "endpos() set on wrong side of result");
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// Bounce off the left-hand side of the result set. Can't move before the
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// starting position.
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auto offset{0}, displacement{0};
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offset = scroll.move(-3, displacement);
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PQXX_CHECK_EQUAL(offset, 0, "Rows found before beginning");
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PQXX_CHECK_EQUAL(displacement, 0, "Failed to bounce off beginning");
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PQXX_CHECK_EQUAL(scroll.pos(), 0, "pos() moved back from zero");
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PQXX_CHECK_EQUAL(scroll.endpos(), -1, "endpos() set on left-side bounce");
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// Try bouncing off the left-hand side a little harder. Take 4 paces away
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// from the boundary and run into it.
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offset = scroll.move(4, displacement);
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PQXX_CHECK_EQUAL(offset, 4, "Offset mismatch");
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PQXX_CHECK_EQUAL(displacement, 4, "Displacement mismatch");
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PQXX_CHECK_EQUAL(scroll.pos(), 4, "Position mismatch");
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PQXX_CHECK_EQUAL(scroll.endpos(), -1, "endpos() set at weird time");
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offset = scroll.move(-10, displacement);
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PQXX_CHECK_EQUAL(offset, 3, "Offset mismatch");
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PQXX_CHECK_EQUAL(displacement, -4, "Displacement mismatch");
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PQXX_CHECK_EQUAL(scroll.pos(), 0, "Hard bounce failed");
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PQXX_CHECK_EQUAL(scroll.endpos(), -1, "endpos() set during hard bounce");
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rows = scroll.fetch(3);
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PQXX_CHECK_EQUAL(scroll.pos(), 3, "Bad pos()");
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PQXX_CHECK_EQUAL(std::size(rows), 3, "Wrong number of rows");
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PQXX_CHECK_EQUAL(rows[2][0].as<int>(), 3, "pos() does not match data");
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rows = scroll.fetch(-1);
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PQXX_CHECK_EQUAL(scroll.pos(), 2, "Bad pos()");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 2, "pos() does not match data");
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rows = scroll.fetch(1);
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PQXX_CHECK_EQUAL(scroll.pos(), 3, "Bad pos() after inverse turnaround");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 3, "Data position mismatch");
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}
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void test_adopted_sql_cursor()
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{
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pqxx::connection conn;
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pqxx::work tx{conn};
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tx.exec0(
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"DECLARE adopted SCROLL CURSOR FOR "
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"SELECT generate_series(1, 3)");
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pqxx::internal::sql_cursor adopted(tx, "adopted", pqxx::cursor_base::owned);
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PQXX_CHECK_EQUAL(adopted.pos(), -1, "Adopted cursor has known pos()");
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PQXX_CHECK_EQUAL(adopted.endpos(), -1, "Adopted cursor has known endpos()");
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auto displacement{0};
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auto rows{adopted.fetch(pqxx::cursor_base::all(), displacement)};
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PQXX_CHECK_EQUAL(std::size(rows), 3, "Wrong number of rows in result");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 1, "Wrong result data");
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PQXX_CHECK_EQUAL(rows[2][0].as<int>(), 3, "Wrong result data");
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PQXX_CHECK_EQUAL(displacement, 4, "Wrong displacement");
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PQXX_CHECK_EQUAL(
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adopted.pos(), -1, "End-of-result set pos() on adopted cur");
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PQXX_CHECK_EQUAL(adopted.endpos(), -1, "endpos() set too early");
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rows = adopted.fetch(pqxx::cursor_base::backward_all(), displacement);
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PQXX_CHECK_EQUAL(std::size(rows), 3, "Wrong number of rows in result");
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PQXX_CHECK_EQUAL(rows[0][0].as<int>(), 3, "Wrong result data");
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PQXX_CHECK_EQUAL(rows[2][0].as<int>(), 1, "Wrong result data");
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PQXX_CHECK_EQUAL(displacement, -4, "Wrong displacement");
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PQXX_CHECK_EQUAL(adopted.pos(), 0, "Failed to recognize starting position");
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PQXX_CHECK_EQUAL(adopted.endpos(), -1, "endpos() set too early");
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auto offset{adopted.move(pqxx::cursor_base::all())};
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PQXX_CHECK_EQUAL(offset, 3, "Unexpected move() offset");
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PQXX_CHECK_EQUAL(adopted.pos(), 4, "Bad position on adopted cursor");
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PQXX_CHECK_EQUAL(adopted.endpos(), 4, "endpos() not set properly");
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// Owned adopted cursors are cleaned up on destruction.
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pqxx::connection conn2;
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pqxx::work tx2(conn2, "tx2");
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tx2.exec0(
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"DECLARE adopted2 CURSOR FOR "
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"SELECT generate_series(1, 3)");
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{
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pqxx::internal::sql_cursor(tx2, "adopted2", pqxx::cursor_base::owned);
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}
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// Modern backends: accessing the cursor now is an error, as you'd expect.
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PQXX_CHECK_THROWS(
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tx2.exec("FETCH 1 IN adopted2"), pqxx::sql_error,
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"Owned adopted cursor not cleaned up");
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tx2.abort();
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pqxx::work tx3(conn2, "tx3");
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tx3.exec(
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"DECLARE adopted3 CURSOR FOR "
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"SELECT generate_series(1, 3)");
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{
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pqxx::internal::sql_cursor(tx3, "adopted3", pqxx::cursor_base::loose);
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}
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tx3.exec("MOVE 1 IN adopted3");
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}
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void test_hold_cursor()
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{
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pqxx::connection conn;
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pqxx::work tx{conn};
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// "With hold" cursor is kept after commit.
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pqxx::internal::sql_cursor with_hold(
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tx, "SELECT generate_series(1, 3)", "hold_cursor",
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pqxx::cursor_base::forward_only, pqxx::cursor_base::read_only,
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pqxx::cursor_base::owned, true);
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tx.commit();
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pqxx::work tx2(conn, "tx2");
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auto rows{with_hold.fetch(1)};
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PQXX_CHECK_EQUAL(
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std::size(rows), 1, "Did not get 1 row from with-hold cursor");
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// Cursor without hold is closed on commit.
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pqxx::internal::sql_cursor no_hold(
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tx2, "SELECT generate_series(1, 3)", "no_hold_cursor",
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pqxx::cursor_base::forward_only, pqxx::cursor_base::read_only,
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pqxx::cursor_base::owned, false);
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tx2.commit();
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pqxx::work tx3(conn, "tx3");
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PQXX_CHECK_THROWS(
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no_hold.fetch(1), pqxx::sql_error, "Cursor not closed on commit");
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}
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void cursor_tests()
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{
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test_forward_sql_cursor();
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test_scroll_sql_cursor();
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test_adopted_sql_cursor();
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test_hold_cursor();
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}
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PQXX_REGISTER_TEST(cursor_tests);
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} // namespace
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