| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | dhm(at)paradigm(dot)webvision(dot)com (dave madden) |
| Cc: | pgsql-general(at)postgreSQL(dot)org |
| Subject: | Re: [GENERAL] detecting NULL from libpq... |
| Date: | 1998-06-20 03:25:35 |
| Message-ID: | 199806200325.XAA06727@candle.pha.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
>
> 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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