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List:       postgresql-general
Subject:    Re: [GENERAL] detecting NULL from libpq...
From:       Bruce Momjian <maillist () candle ! pha ! pa ! us>
Date:       1998-06-20 3:25:35
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> 
> 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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