Re: [INTERFACES] Counting updates with libpq

Michael Meskes <meskes(at)postgreSQL(dot)org> writes:
>> No. PQntuples() is the number of rows in the returned result. It will
>> always be zero if the SQL command was not SELECT (or FETCH).

> I'm afraid this is incorrect. I tried it on an insert (via exec sql execute
> immediate) and it got the correct result.

No, I'm afraid *you* are incorrect: a test program like

res = PQexec(conn, "INSERT INTO test SELECT * FROM test");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
fprintf(stderr, "INSERT command failed\n");
PQclear(res);
exit_nicely(conn);
}

printf("INSERT result PQntuples = %d\n", PQntuples(res));
printf("INSERT result PQcmdTuples = %s\n", PQcmdTuples(res));

produces the expected results (ntuples = 0, cmdTuples = number of
inserted rows) for either variant of INSERT.

It seems likely that ecpg is interposing some additional behavior
not seen in bare libpq, although I'm at a loss to guess what.
Surely ecpg wouldn't be trying to implicitly fetch the inserted rows?

regards, tom lane