topic Re: NEW constractor expression in Application Development and Automation Discussions

NEW constractor expression

former_member601153 — Wed, 20 Apr 2022 13:29:48 GMT

Hi all,

I was wondering what is the defference between the two. In what ways IT_INPUT is different from IT_INPUT1?

TYPES: BEGIN OF ty_input,
        cola TYPE string,
        colb TYPE string,
       END OF ty_input.
DATA: it_input TYPE STANDARD TABLE OF ty_input.
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
TYPES: ty_input1 TYPE TABLE OF t100 WITH EMPTY KEY.
DATA:it_input1 TYPE REF TO ty_input1.
it_input1 = NEW #( ).

Re: NEW constractor expression

FredericGirod — Wed, 20 Apr 2022 13:38:04 GMT

the usage is different :

it_input = value #( ( cola = 'a'   colb = 'b' ) ).
it_input1->*  = value #( ( text = 'a' ) ( text = 'b' ) ).

For me the big difference, is, you could modify the "ref to" data in another part of your code (another method even if you set USING).

I don't know why, NEW with data give me pimples

Re: NEW constractor expression

former_member601153 — Wed, 20 Apr 2022 13:41:44 GMT

Can you provide an example for what you said please?

For me the big difference, is, you could modify the "ref to" data in another part of your code (another method even if you set USING).

Re: NEW constractor expression

Sandra_Rossi — Wed, 20 Apr 2022 14:05:34 GMT

One is an internal table, one is a reference to an internal table. Are you asking what is a data reference?

Re: NEW constractor expression

FredericGirod — Thu, 21 Apr 2022 07:13:18 GMT


class my_beautiful_class definition.
public section.
  methods my_method_1.
  methods my_method_2
    importing
      o_table type ref to ty_input1.
endclass.

class my_beautiful_class implementation.
  method my_method_1.
    data it_input1 type ref to ty_input1.
    it_input1 = new #( ).
    it_input1->* = value #( ( text = 'a' ) ).
    my_method_2( it_input1 ).
    cl_demo_output=>display_data( it_input1->* ).
  endmethod.

  method my_method_2.
    append value t100( text = 'b' ) to o_table->*.
  endmethod.
endclass.


start-of-selection.
  data(o_cut) = new my_beautiful_class( ).
  o_cut->my_method_1( ).
end-of-selection.

Re: NEW constractor expression

former_member601153 — Thu, 21 Apr 2022 15:33:25 GMT

sandra.rossi what do data references bring to the table? Meaning why should I used them instead of internal tables, is there anything to be gained; performance wise?

Also what are the key differences between a data reference and an internal table.

Already did some research but I am hoping a discussion between fellow ABAPers will add more value to my learning experience.

Re: NEW constractor expression

Sandra_Rossi — Thu, 21 Apr 2022 15:49:03 GMT

1. what do data references bring to the table?

Nothing special concerning tables. The question concerns any kind of data type. I continue with the example of internal tables because you are focused on internal tables for some reason. Imagine that you want to refer to the same internal table from two different variables, and that you want any update to replicate automatically. You won't duplicate the internal table, it's easier to have one internal table, and have each variable point to the same internal table through a data reference.

2. Meaning why should I used them instead of internal tables, is there anything to be gained; performance wise?

Performance. Memory. Possibly more simple.

PS: if you don't have a use case, just forget about data references for now...