Done with implementing PDO in delete_member function.
Done with implementing PDO in update_fullname function.
Fixing the return value of update_fullname function.
Done with implementing PDO in rep_company function.
Done with implementing PDO in get_tribe_id function.
Done with implementing PDO in add_married function.
Done with implementing PDO in update_husband_marital_status function.
Done with implementing PDO in update_wife_marital_status function.
Done with implementing PDO in update_member_is_alive function.