Status question

I'm confused about something and need some help. I wrote a c routine
that uses libpq. if I use an update sql command string like
"update largetable set t01='update1', t02='update2' where mainkey='12'"
and the mainkey of 12 does not exist the result code is a 0. If the
mainkey exists I get a result of 0. How can I tell if the update was
successful or not. Here is the code.

void

pgsql_exec_query( int *dbhandle, char *query, int *qryhandle, int
*status ) {
char *r,*n=query;

int nfields, i, j;

PGconn *conn = (PGconn *)*dbhandle;

PGresult *res;

while ( *n != ';' || *(n+1) != ';' )
n++;
*n=0;

res = 0;

res = PQexec(conn, query);

printf("Result = %d ", (int) res);

*status = PQresultStatus(res);

printf("status = %f", (int) status);
*qryhandle = (int) res;
}

}

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