Is it possible to specify a data structure where the hierarchy is the
same table? For example, a bill of material has "parts" contain other
parts, but all the parts are still in the same table. I tried to
specify the dbo class as shown below, but that causes the program to
crash when session::createTables() is called. Is there a way to do
this?
Also, is is possible to place a NULL value in the database using wt::dbo?
#include <Wt/WString>
#include <Wt/Dbo/Types>
#include <Wt/Dbo/WtSqlTraits>
class Part;
namespace dbo = Wt::Dbo;
class Part : public dbo::Dbo {
public:
dbo::ptr<Part> parent;
std::string refdes;
std::string value;
template<class Action>
void persist(Action& a) {
dbo::belongsTo(a, parent, "part");
dbo::field(a, refdes, "refdes");
dbo::filed(a, value, "value");
}
};
DBO_EXTERN_TEMPLATES(Part);
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