How to dynamically create an Internal Table?

Below code might give you some idea:

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 dyanamic internal table **
   perform get_data.
   perform write_out.

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 .
       xfc-datatype = xdetails-type_kind.
       xfc-inttype = xdetails-type_kind.
       xfc-intlen  = xdetails-length." / 2.
       xfc-decimals = xdetails-decimals. " / 2.
       append xfc  to ifc.
  endloop.

endform.

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
    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.

form get_data.

* Select Data from table.
  select * into table <dyn_table>
     from (p_table).

endform.

form write_out.
* Write out data from table.

   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.

<b>Thanks to the Original Contributors.</b>

Kind Regards

Eswar

Have a look at below code.

REPORT ZCLUST1 .

• Example: how to create a dynamic internal table

• The dynamic internal table stucture

DATA: BEGIN OF STRUCT OCCURS 10,

FILDNAME(8) TYPE C,

ABPTYPE TYPE C,

LENGTH TYPE I,

END OF STRUCT.

• The dynamic program source table

DATA: BEGIN OF INCTABL OCCURS 10,

LINE(72),

END OF INCTABL.

DATA: LNG TYPE I, TYPESRTING(6).

• Sample dynamic internal table stucture

STRUCT-FILDNAME = 'field1'. STRUCT-ABPTYPE = 'c'. STRUCT-LENGTH = '6'.

APPEND STRUCT. CLEAR STRUCT.

STRUCT-FILDNAME = 'field2'. STRUCT-ABPTYPE = 'd'.

APPEND STRUCT. CLEAR STRUCT.

STRUCT-FILDNAME = 'field3'. STRUCT-ABPTYPE = 'i'.

APPEND STRUCT. CLEAR STRUCT.

• Create the dynamic internal table definition in the dyn. program

INCTABL-LINE = 'program zdynpro.'. APPEND INCTABL.

INCTABL-LINE = 'data: begin of dyntab occurs 10,'. APPEND INCTABL.

LOOP AT STRUCT.

INCTABL-LINE = STRUCT-FILDNAME.

LNG = STRLEN( STRUCT-FILDNAME ).

IF NOT STRUCT-LENGTH IS INITIAL .

TYPESRTING(1) = '('.

TYPESRTING+1 = STRUCT-LENGTH.

TYPESRTING+5 = ')'.

CONDENSE TYPESRTING NO-GAPS.

INCTABL-LINE+LNG = TYPESRTING.

ENDIF.

INCTABL-LINE+15 = 'type '.

INCTABL-LINE+21 = STRUCT-ABPTYPE.

INCTABL-LINE+22 = ','.

APPEND INCTABL.

ENDLOOP.

INCTABL-LINE = 'end of dyntab. '.

APPEND INCTABL.

• Create the code processes the dynamic internal table

INCTABL-LINE = ' '. APPEND INCTABL.

INCTABL-LINE = 'dyntab-field1 = ''aaaaaa''.'. APPEND INCTABL.

INCTABL-LINE = 'dyntab-field1 = ''19970814''.'. APPEND INCTABL.

INCTABL-LINE = 'dyntab-field1 = 1.'. APPEND INCTABL.

INCTABL-LINE = 'append dyntab.'. APPEND INCTABL.

INCTABL-LINE = ' '. APPEND INCTABL.

INCTABL-LINE = 'loop at dyntab.'. APPEND INCTABL.

INCTABL-LINE = 'write: / dyntab.'. APPEND INCTABL.

INCTABL-LINE = 'endloop.'. APPEND INCTABL.

• Create and run the dynamic program

INSERT REPORT 'zdynpro'(001) FROM INCTABL.

SUBMIT ZDYNPRO.

I hope it helps.

Best Regards,

Vibha

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