Dynamic Internal Table or Array

A sample code how to create a Dynamic Internal Table or Array using Class CL_ALV_TABLE_CREATE

TYPE-POOLS : abap.
FIELD-SYMBOLS: <dyn_table> TYPE STANDARD TABLE,
               <dyn_wa>,
               <dyn_field>.
DATA: dy_table TYPE REF TO data,
    dy_line  TYPE REF TO data,
    xfc TYPE lvc_s_fcat,
    ifc TYPE lvc_t_fcat.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
PARAMETERS: p_table(30) TYPE c DEFAULT 'T001'.
SELECTION-SCREEN END OF BLOCK b1.

START-OF-SELECTION.
  PERFORM get_structure.
  PERFORM create_dynamic_itab.

*******Creates a dynamic internal table*********
  PERFORM get_data.
  PERFORM write_out.

*&---------------------------------------------------------------------*
*&      Form  get_structure
*&---------------------------------------------------------------------*
FORM get_structure.
  DATA : idetails TYPE abap_compdescr_tab,
       xdetails TYPE abap_compdescr.
  DATA : ref_table_des TYPE REF TO cl_abap_structdescr.
* Get the structure of the table.
  ref_table_des ?=
      cl_abap_typedescr=>describe_by_name( p_table ).
  idetails[] = ref_table_des->components[].
  LOOP AT idetails INTO xdetails.
    CLEAR xfc.
    xfc-fieldname = xdetails-name .
    CASE xdetails-type_kind.
      WHEN 'C'.
        xfc-datatype = 'CHAR'.
      WHEN 'N'.
        xfc-datatype = 'NUMC'.
      WHEN 'D'.
        xfc-datatype = 'DATE'.
      WHEN 'P'.
        xfc-datatype = 'PACK'.
      WHEN OTHERS.
        xfc-datatype = xdetails-type_kind.
    ENDCASE.
    xfc-inttype = xdetails-type_kind.
    xfc-intlen = xdetails-length.
    xfc-decimals = xdetails-decimals.
    APPEND xfc TO ifc.
  ENDLOOP.
ENDFORM.                    "get_structure

*&---------------------------------------------------------------------*
*&      Form  create_dynamic_itab
*&---------------------------------------------------------------------*
FORM create_dynamic_itab.
* Create dynamic internal table and assign to FS
  CALL METHOD cl_alv_table_create=>create_dynamic_table
    EXPORTING
      it_fieldcatalog  = ifc
      i_length_in_byte = 'X' "added by Paul Robert Oct 28, 2009 17:04
    IMPORTING
      ep_table         = dy_table.
  ASSIGN dy_table->* TO <dyn_table>.
* Create dynamic work area and assign to FS
  CREATE DATA dy_line LIKE LINE OF <dyn_table>.
  ASSIGN dy_line->* TO <dyn_wa>.
ENDFORM.                    "create_dynamic_itab

*&---------------------------------------------------------------------*
*&      Form  get_data
*&---------------------------------------------------------------------*
FORM get_data.
* Select Data from table.
  SELECT * INTO TABLE <dyn_table>
           FROM (p_table).
ENDFORM.                    "get_data

*&---------------------------------------------------------------------*
*&      Form  write_out
*&---------------------------------------------------------------------*
FORM write_out.
  LOOP AT <dyn_table> INTO <dyn_wa>.
    DO.
      ASSIGN COMPONENT  sy-index
         OF STRUCTURE <dyn_wa> TO <dyn_field>.
      IF sy-subrc <> 0.
        EXIT.
      ENDIF.
      IF sy-index = 1.
        WRITE:/ <dyn_field>.
      ELSE.
        WRITE: <dyn_field>.
      ENDIF.
    ENDDO.
  ENDLOOP.
ENDFORM.                    "write_out