Hello,
I have some serious problem with soci::rowset template.
Consider following code:
rowset<unsigned long> accounts = sql.prepare << string("select
distinct owner_ID_FK as konto from Simple_Node where ID=5");
What happens when result of above query is null? I get an exception:
Error: Null value fetched and no indicator defined.
How can I avoid throwing this exception? I tried:
LongRowset oids = (sql.prepare << string("select distinct oid from
Gemius_Node where node_ID_FK=5") , into(ind));
But this results in some compilation errors:
error: incomplete type
‘soci::details::exchange_traits<soci::indicator>’ used in nested name
specifier|
IMHO fetching null value shuld result in empty rowset:
rowset<unsigned long> accounts = sql.prepare << string("select
distinct owner_ID_FK as konto from Simple_Node where ID=5");
if(accounts.empty())
{
//no results - now I can react
}
but rowset template don't have empty() method. It don't have even
size() method and I don't understand why.
Can you explain how to check for empty result in rowset assignment?
--
Regards,
Michał Nowotka
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