detecting NULL from libpq...

Hi. I'm wondering if it's possible to tell whether a field returned
by PQgetvalue() is NULL? Can one distinguish between a varchar field
that contains a string of zero length and a varchar field that is
NULL? (And if so, how? :-)

From man libpq:

PQgetisnull returns the NULL status of a field.
int PQgetisnull(PGresult *res,
int tup_num,
int field_num);

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