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87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
#include <pqxx/transaction>
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#include <pqxx/transactor>
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#include "test_helpers.hxx"
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using namespace pqxx;
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// Test program for libpqxx. Verify abort behaviour of transactor.
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//
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// The program will attempt to add an entry to a table called "pqxxevents",
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// with a key column called "year"--and then abort the change.
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//
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// Note for the superstitious: the numbering for this test program is pure
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// coincidence.
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namespace
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{
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// Let's take a boring year that is not going to be in the "pqxxevents" table
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constexpr unsigned int BoringYear = 1977;
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// Count events and specifically events occurring in Boring Year, leaving the
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// former count in the result pair's first member, and the latter in second.
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std::pair<int, int> count_events(connection &conn, std::string const &table)
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{
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work tx{conn};
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std::string const count_query{"SELECT count(*) FROM " + table};
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return std::make_pair(
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tx.query_value<int>(count_query),
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tx.query_value<int>(count_query + " WHERE year=" + to_string(BoringYear)));
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}
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struct deliberate_error : std::exception
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{};
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void failed_insert(connection &C, std::string const &table)
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{
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work tx(C);
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result R = tx.exec0(
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"INSERT INTO " + table + " VALUES (" + to_string(BoringYear) +
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", "
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"'yawn')");
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PQXX_CHECK_EQUAL(R.affected_rows(), 1, "Bad affected_rows().");
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throw deliberate_error();
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}
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void test_013()
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{
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connection conn;
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{
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work tx{conn};
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test::create_pqxxevents(tx);
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tx.commit();
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}
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std::string const Table{"pqxxevents"};
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auto const Before{
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perform([&conn, &Table] { return count_events(conn, Table); })};
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PQXX_CHECK_EQUAL(
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Before.second, 0,
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"Already have event for " + to_string(BoringYear) + "--can't test.");
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quiet_errorhandler d(conn);
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PQXX_CHECK_THROWS(
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perform([&conn, &Table] { failed_insert(conn, Table); }), deliberate_error,
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"Failing transactor failed to throw correct exception.");
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auto const After{
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perform([&conn, &Table] { return count_events(conn, Table); })};
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PQXX_CHECK_EQUAL(
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After.first, Before.first, "abort() didn't reset event count.");
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PQXX_CHECK_EQUAL(
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After.second, Before.second,
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"abort() didn't reset event count for " + to_string(BoringYear));
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}
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PQXX_REGISTER_TEST(test_013);
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} // namespace
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