Creating Dynamic Internal table with RTTS

Scenario: This post shows how to create an internal table using RTTS concepts.

Step1. Create a program in SE38.
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*&---------------------------------------------------------------------*
*& Report  ZDEMO3_DYNAMIC_TABLE_CREATION
*&
*&---------------------------------------------------------------------*
*&
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*&---------------------------------------------------------------------*

REPORT  zdemo3_dynamic_table_creation.

PARAMETERS : tab_name TYPE dd02l-tabname OBLIGATORY.

DATA : ls_tab TYPE dd02l,
             lo_type TYPE REF TO cl_abap_typedescr,
             lo_struc TYPE REF TO cl_abap_structdescr,
             lo_struct TYPE REF TO cl_abap_structdescr,
            lt_comp TYPE abap_component_tab,
            lo_table TYPE REF TO cl_abap_tabledescr,
            lo_grid TYPE REF TO cl_gui_alv_grid,
            dr_tab TYPE REF TO data.
FIELD-SYMBOLS : <fs_tab> TYPE STANDARD TABLE.


START-OF-SELECTION.
  SELECT SINGLE * FROM dd02l INTO ls_tab WHERE tabname = tab_name.
  IF sy-subrc <> 0.
    MESSAGE 'Table does not Exist.' TYPE 'S'.
    LEAVE LIST-PROCESSING.
  ENDIF.

  CALL METHOD cl_abap_typedescr=>describe_by_name
    EXPORTING
      p_name      = tab_name
    RECEIVING
      p_descr_ref = lo_type.

  lo_struc ?= lo_type.
  CALL METHOD lo_struc->get_components
    RECEIVING
      p_result = lt_comp.

  CALL METHOD cl_abap_structdescr=>create
    EXPORTING
      p_components = lt_comp
    RECEIVING
      p_result     = lo_struct.

  CALL METHOD cl_abap_tabledescr=>create
    EXPORTING
      p_line_type = lo_struct
    RECEIVING
      p_result    = lo_table.

  CREATE DATA dr_tab TYPE HANDLE lo_table.

  ASSIGN dr_tab->* TO <fs_tab>.

  SELECT * FROM (tab_name) INTO TABLE <fs_tab>.

END-OF-SELECTION.

  CREATE OBJECT lo_grid
    EXPORTING
      i_parent          = cl_gui_container=>default_screen.

  CALL METHOD lo_grid->set_table_for_first_display
    EXPORTING
      i_structure_name = tab_name
    CHANGING
      it_outtab        = <fs_tab>.

  CALL SCREEN 9999.
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Step2.

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