[odb-users] problem dereferncing result pointer ...

[Roberto Alejandro Espí Muñoz]

Hi ... I wrote a simple program that connects to a PGSQL database and
persists and executes a query later on, following up on the provided
examples.

The part where I persist works perfectly:

boost::shared_ptr< Guest > g ( new Guest() );
boost::shared_ptr< Hotel > l ( new Hotel() );
boost::shared_ptr< Room > r ( new Room() );
l->Rooms_.push_back ( r );
boost::shared_ptr< Stay > s1 ( new Stay );
s1->Guests_.push_back ( g );
s1->Rooms_.push_back ( r );
g->Stay_ = s1;
r->Stay_ = s1;
r->Location_ = l;

{
    odb::transaction t ( Central::getInstance()->getDB()->begin() );
    Central::getInstance()->getDB()->persist ( l );
    Central::getInstance()->getDB()->persist ( s1 );
    Central::getInstance()->getDB()->persist ( g );
    Central::getInstance()->getDB()->persist ( r );
    t.commit();
}

Up to here everything perfect.

When I execute a query I experience an interesting behaviour:

typedef odb::query< Location > query;
typedef odb::result< Location > result;

{
    odb::transaction t ( Central::getInstance()->getDB()->begin() );
    result r = Central::getInstance()->getDB()->query< Location > ();

   if ( !r.empty() )
   {
        for ( auto i ( r.begin() ); i != r.end(); ++i )
        {
              std::cout << "ID " << i.id() << std::endl;
              //(*i);
        }
    }
    t.commit();
}

Notice the //(*i) part? If I run it with that line commented, I get a
correct std::cout with the id of the results, if I uncomment it then
my programs hangs in that line and later crashes.

I don't think there's a problem with my entities since I managed to
persist them ok.

Any advice?, thanks in advance



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teratux
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