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#include "test_helpers.hxx"
using namespace PGSTD;
using namespace pqxx;
// Test program for libpqxx. Verify abort behaviour of transactor.
//
// The program will attempt to add an entry to a table called "pqxxevents",
// with a key column called "year"--and then abort the change.
//
// Note for the superstitious: the numbering for this test program is pure
// coincidence.
namespace
{
// Let's take a boring year that is not going to be in the "pqxxevents" table
const int BoringYear = 1977;
// Count events and specifically events occurring in Boring Year, leaving the
// former count in the result pair's first member, and the latter in second.
class CountEvents : public transactor<>
{
string m_Table;
pair<int, int> &m_Results;
public:
CountEvents(string Table, pair<int,int> &Results) :
transactor<>("CountEvents"), m_Table(Table), m_Results(Results) {}
void operator()(argument_type &T)
{
const string CountQuery = "SELECT count(*) FROM " + m_Table;
result R;
R = T.exec(CountQuery);
R.at(0).at(0).to(m_Results.first);
R = T.exec(CountQuery + " WHERE year=" + to_string(BoringYear));
R.at(0).at(0).to(m_Results.second);
}
};
struct deliberate_error : exception
{
};
class FailedInsert : public transactor<>
{
string m_Table;
static string LastReason;
public:
FailedInsert(string Table) :
transactor<>("FailedInsert"),
m_Table(Table)
{
}
void operator()(argument_type &T)
{
T.exec("INSERT INTO " + m_Table + " VALUES (" +
to_string(BoringYear) + ", "
"'yawn')");
throw deliberate_error();
}
void on_abort(const char Reason[]) throw ()
{
if (Reason != LastReason)
{
pqxx::test::expected_exception(
"Transactor " + Name() + " failed: " + Reason);
LastReason = Reason;
}
}
};
string FailedInsert::LastReason;
void test_032(transaction_base &)
{
lazyconnection C;
{
nontransaction W(C);
test::create_pqxxevents(W);
}
const string Table = "pqxxevents";
pair<int,int> Before;
C.perform(CountEvents(Table, Before));
PQXX_CHECK_EQUAL(
Before.second,
0,
"Already have event for " + to_string(BoringYear) + ", cannot test.");
const FailedInsert DoomedTransaction(Table);
{
quiet_errorhandler d(C);
PQXX_CHECK_THROWS(
C.perform(DoomedTransaction),
deliberate_error,
"Did not get expected exception from failing transactor.");
}
pair<int,int> After;
C.perform(CountEvents(Table, After));
PQXX_CHECK_EQUAL(After.first, Before.first, "Event count changed.");
PQXX_CHECK_EQUAL(
After.second,
Before.second,
"Event count for " + to_string(BoringYear) + " changed.");
}
} // namespace
PQXX_REGISTER_TEST_NODB(test_032)
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