Under a type : Type Hierarchy « Object Oriented Database « Oracle PL / SQL






Under a type

  
SQL>
SQL>
SQL> create or replace
  2  type employee as object(
  3    name varchar2(100),
  4    empno number,
  5    hiredate date,
  6    vacation_used number,
  7    final member procedure vacation( p_days number ),
  8    not instantiable member procedure give_raise( p_increase number ),
  9    not instantiable member function yearly_compensation return number
 10  )
 11  not instantiable
 12  not final
 13  /

Type created.

SQL>
SQL> create or replace
  2  type body employee as
  3    final member procedure vacation( p_days number ) is
  4    begin
  5      if p_days + self.vacation_used <= 10 then
  6        self.vacation_used := self.vacation_used + p_days;
  7      else
  8        raise_application_error(
  9          -20001,
 10          'You are ' || to_char(p_days + self.vacation_used - 10) ||' days over your vacation limit.' );
 11      end if;
 12    end;
 13  end;
 14  /

Type body created.

SQL>
SQL>
SQL> create or replace type consultant under employee(
  2    hourly_rate number,
  3    overriding member procedure give_raise( p_increase number ),
  4    overriding member function yearly_compensation return number
  5  )
  6  /

Type created.

SQL>
SQL>
SQL>
SQL> create or replace
  2  type body consultant as
  3    overriding member procedure give_raise( p_increase number ) is
  4    begin
  5      self.hourly_rate := self.hourly_rate + p_increase;
  6    end;
  7    overriding member function yearly_compensation return number is
  8    begin
  9      return self.hourly_rate * 40 * 52;
 10    end;
 11  end;
 12  /

Type body created.

SQL>
SQL> drop type consultant;

Type dropped.

SQL>
SQL> drop type employee;

Type dropped.

SQL>

   
  








Related examples in the same category

1.Save type hierarchy to one table with parent type as the column type
2.Constructors in hierarchical types
3.dependencies among object types.
4.Mutual-exclusion inheritance using "under"