PL/SQL table类型的使用

declare
   type type_table_login_name is table of login.login_name%type index by binary_integer;
   v_name type_table_login_name;
begin
   v_name(0):='test';
   dbms_output.put_line(v_name(0));
exception
   when others then
   dbms_output.put_line('error');
end;
/