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109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
#include <cstdio>
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#include <iostream>
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#include <vector>
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#include <pqxx/nontransaction>
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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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// Test program for libpqxx. Open connection to database, start a transaction,
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// abort it, and verify that it "never happened."
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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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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 int BoringYear{1977};
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std::string const Table{"pqxxevents"};
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// Count events, and boring events, in table
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std::pair<int, int> CountEvents(transaction_base &tx)
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{
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std::string const events_query{"SELECT count(*) FROM " + Table};
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std::string const boring_query{
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events_query + " WHERE year=" + to_string(BoringYear)};
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return std::make_pair(
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tx.query_value<int>(events_query), tx.query_value<int>(boring_query));
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}
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// Try adding a record, then aborting it, and check whether the abort was
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// performed correctly.
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void Test(connection &conn, bool ExplicitAbort)
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{
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std::vector<std::string> BoringRow{to_string(BoringYear), "yawn"};
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std::pair<int, int> EventCounts;
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// First run our doomed transaction. This will refuse to run if an event
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// exists for our Boring Year.
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{
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// Begin a transaction acting on our current connection; we'll abort it
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// later though.
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work Doomed(conn, "Doomed");
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// Verify that our Boring Year was not yet in the events table
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EventCounts = CountEvents(Doomed);
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PQXX_CHECK_EQUAL(
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EventCounts.second, 0,
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"Can't run; " + to_string(BoringYear) + " is already in the table.");
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// Now let's try to introduce a row for our Boring Year
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Doomed.exec0(
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"INSERT INTO " + Table +
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"(year, event) "
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"VALUES (" +
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to_string(BoringYear) + ", 'yawn')");
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auto Recount{CountEvents(Doomed)};
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PQXX_CHECK_EQUAL(Recount.second, 1, "Unexpected number of events.");
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PQXX_CHECK_EQUAL(
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Recount.first, EventCounts.first + 1, "Number of events changed.");
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// Okay, we've added an entry but we don't really want to. Abort it
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// explicitly if requested, or simply let the Transaction object "expire."
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if (ExplicitAbort)
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Doomed.abort();
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// If now explicit abort requested, Doomed Transaction still ends here
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}
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// Now check that we're back in the original state. Note that this may go
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// wrong if somebody managed to change the table between our two
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// transactions.
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work Checkup(conn, "Checkup");
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auto NewEvents{CountEvents(Checkup)};
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PQXX_CHECK_EQUAL(
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NewEvents.first, EventCounts.first, "Wrong number of events.");
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PQXX_CHECK_EQUAL(NewEvents.second, 0, "Found unexpected events.");
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}
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void test_029()
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{
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connection conn;
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{
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nontransaction tx{conn};
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test::create_pqxxevents(tx);
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}
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// Test abort semantics, both with explicit and implicit abort
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Test(conn, true);
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Test(conn, false);
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}
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PQXX_REGISTER_TEST(test_029);
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} // namespace
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