hi
I have a problen trying to define a composite primary key, which is
composed of a composite foreing key and other foreing key
the code is:
class Turnos; // this class represent table turnos
class Frentes; //this class represent table frentes
class TipoServicio;// other class whith sample primary key
class TurnosFrentes;// here composite primary key of foreing key ...
(Turnos and Frentes)
class ServiciosFrentes; // here is problem to define primary key of
foring key (TurnosFrentes and TiposServivios)
namespace dbo = Wt::Dbo;
template<class F, class S>
class IdComp
{
public:
dbo::ptr<F> first;
dbo::ptr<S> second;
IdComp() { }
IdComp(dbo::ptr<F> f, dbo::ptr<S> s)
: first(f), second(s) { }
bool operator== (const IdComp& otro) const
{
return first == otro.first && second == otro.second;
}
bool operator< (const IdComp& otro) const
{
if (first < otro.first)
return true;
else if ( first == otro.first)
return second < otro.second;
else
return false;
}
};
template<class F, class S>
std::ostream& operator<< (std::ostream& o, const IdComp<F, S>& iidd)
{
return o << "(" << iidd.first << "," << iidd.second << ")";
}
typedef IdComp< IdComp<Turnos, Frentes> ,TiposServicios > IdCC;
namespace Wt {
namespace Dbo {
template <class Action>
void field(Action& action, IdCC& tf_id, const std::string& name,
int size = -1)
{
belongsTo(action, tf_id.first->first, "turnos", dbo::NotNull);
belongsTo(action, tf_id.first->second, "frentes", dbo::NotNull);
belongsTo(action, tf_id.second, "servicios", dbo::NotNull);
}
}
}
namespace Wt {
namespace Dbo {
template<>
struct dbo_traits<ServiciosFrentes> : public dbo_default_traits
{
typedef IdCC IdType;
static IdType invalidId() { return IdCC(); }
static const char *surrogateIdField() { return 0; }
};
}
}
class ServiciosFrentes
{
public:
IdCC _id;
std::string _activa;
template<class Action>
void persist(Action& a)
{
dbo::id(a,_id,"id");
dbo::field(a, _activa, "activa");
}
};
sorry for my english...
thank
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