jois(dot)de(dot)vivre(at)gmail(dot)com writes:
> My question is, what constitutes a PGRES_FATAL_ERROR or a
> PGRES_BAD_RESPONSE?
FATAL is probably a bad choice of words here; it basically means any
error condition reported by the server that caused execution of your
query to be abandoned. NONFATAL_ERROR actually means "notice or
warning message", and isn't a possible return code from PQexec anyway.
I think BAD_RESPONSE is historical at the moment; I don't see it being
generated anywhere in the library.
regards, tom lane