Property handle macros
Since open property handle is an activity frequently required in application programming, the are some macros provided for making life easier:
- PH - Property handle constructor have the same name as the property name
- PHN - Property handle constructor, where the property handle name may differ from the property name
- GPH - GetPropertyHandle ()
The rules for creating handle copies and cursor copies are the same, i.e. passing a property handle pointer to the macro will create a handle copy and passing a property handle will create a cursor copy.
void OpenHandleHierarchy ( DBObjectHandle &dbo ) {
PropertyHandle person(dbo,"Person::Persons",PI_Read);
PropertyHandle *pchildren;
// PropertyHandle children(person,"children");
PH(person,children);
// PropertyHandle grand_children(children,"children");
PHN(person,children,grand_children);
// pchildren = person.GetPropertyHandle("children");
pchildren = person.GPH("children");
...
}