Moving odb pragmas outside class header

Question

Is way to move odb (c++ orm like framework) pragmas outside class header? For example I define class basic_object (abstract) with id only:

class basic_object  {
   int _id;
public:
    int get_id() const;
    void set_id(int _id);
};

And then create pragmas for that class in another file

#pragma db object(basic_object) abstract
#pragma db member(basic_object::_id) get(get_id) set(set_id) id auto

Answer 1

Yes, you can, it's called named pragmas.

In your other file you would have to write

#pragma db object(basic_object)
#pragma db member(basic_object::_id) id

---

Then you have to tell the odb compiler where to look for. You can either do this by adding

#ifdef ODB_COMPILER
#include "other_file.hxx"
#endif

to your original file OR by using

--odb-epilogue '#include "other_file.hxx"'

as parameter to the odb compiler.

---

But there is one problem in the example class basic_object you had given: Your data field _id is private. You can fix this by

declaring it public

or

by adding the odb access class as a friend in your class with:

private:
friend class odb::access;