topic Re: Dynamic Variable Declaration in Application Development and Automation Discussions

Dynamic Variable Declaration

Former Member — Tue, 06 Dec 2011 11:41:07 GMT

Hi Experts,

Is there any way in ABAP to declare a variable based on user input.

Like below code.


DATA:var1 TYPE string.
DATA :varx(25) TYPE c.
PARAMETERS :  varname(20) TYPE c,
vartype TYPE c,
varlen(2) TYPE c,
vardec(2) TYPE c.

START-OF-SELECTION.
  CONCATENATE varname '('  varlen ')' INTO varx.
  CONDENSE varx NO-GAPS.
  IF vartype = 'P' AND vardec IS NOT INITIAL.
    CONCATENATE  'Data:' varx 'Type' vartype 'Decimals' vardec '.' INTO var1 SEPARATED BY space.
  ELSE.
    CONCATENATE 'Data:' varx 'Type' vartype '.' INTO var1 SEPARATED BY space.
  ENDIF.

  WRITE: var1.

Re: Dynamic Variable Declaration

kesavadas_thekkillath — Tue, 06 Dec 2011 12:04:56 GMT

If you very much keen about the name entered you can check with the code below else you can remove the varaible name from screen and assign it to a field symbol of type any. Check the other methods available in class cl_abap_elemdescr


PARAMETERS :  varname(20) TYPE c,
              vartype TYPE c,
              varlen TYPE i,
              vardec TYPE i.

DEFINE mcr.
  field-symbols:<&1> type any.
END-OF-DEFINITION.

DEFINE write_val.
  assign wf_ref->* to <&1>.
  check <&1> is assigned.
  <&1> = '1234'.
  write: <&1>.
END-OF-DEFINITION.

DATA:data_type TYPE REF TO cl_abap_elemdescr,
     wf_ref TYPE REF TO data.

START-OF-SELECTION.

  mcr varname.
  IF vartype = 'P'.
    TRY.
        CALL METHOD cl_abap_elemdescr=>get_p
          EXPORTING
            p_length   = varlen
            p_decimals = vardec
          RECEIVING
            p_result   = data_type.
      CATCH cx_parameter_invalid_range .
    ENDTRY.
  ELSEIF vartype = 'I'.
    CALL METHOD cl_abap_elemdescr=>get_i
      RECEIVING
        p_result = data_type.
  ELSEIF vartype = 'C'.
    TRY.
        CALL METHOD cl_abap_elemdescr=>get_c
          EXPORTING
            p_length = varlen
          RECEIVING
            p_result = data_type.
      CATCH cx_parameter_invalid_range .
    ENDTRY.

  ENDIF.

  CREATE DATA wf_ref TYPE HANDLE data_type.
  CHECK wf_ref IS BOUND.
  write_val varname.

Re: Dynamic Variable Declaration

Former Member — Sat, 16 Feb 2013 09:54:54 GMT

I cant tell you how thankful i'am., I was searching for such a solution for 2 days. Thanks a lot

Re: Dynamic Variable Declaration

Former Member — Sun, 03 Mar 2013 20:05:59 GMT

Hi,

I tried this strategy to create field-symbols that could be referenced in a WHERE (whr) string. Though my code didn't abort, the field-symbol i created with <&1> didn't seem to exist outside the define methods. Do you know why this would be? My code is like this


  "create a field-symbol of the supplied name, assign lr_param->* to it so it can be modified outside the macro
DEFINE make_var.
FIELD-SYMBOLS: <&1> TYPE PIQ_SELOPT_T.
ASSIGN lr_param->* TO <&1>.
END-OF-DEFINITION.
DATA: lv_param TYPE selopt.
CREATE DATA lr_param.
LOOP AT lt_varnames INTO var.
REFRESH lr_param->*.
LOOP AT lt_screen INTO <val> WHERE selname = var.
MOVE-CORRESPONDING <val> TO lv_param.
APPEND lv_param TO lr_param->*.
ENDLOOP.
make_var var. "<var> gets assigned to <opts>
ASSIGN lr_param->* TO <so_mtart>.
CONCATENATE '<' var '>' INTO var. "new name
REPLACE <val>-selname IN whr WITH var.
ENDLOOP.

Thanks,

Lindsay

Re: Dynamic Variable Declaration

kesavadas_thekkillath — Mon, 04 Mar 2013 05:29:43 GMT

Write your code without a macro. It will work ( avoid make_var and declare your field symbol globally )

Re: Dynamic Variable Declaration

rosenberg_eitan — Mon, 04 Mar 2013 06:03:07 GMT

Hi,

Can you tell us what was the business requirement in this case .

Thank you in advance.

Eitan.

Re: Dynamic Variable Declaration

Former Member — Mon, 04 Mar 2013 12:12:29 GMT

HI Kesavadas

Thanks for the quick reply. My question was based on your example above where you use macros (below) to allow for the creation of dynamically named variables...If I simple remove the macro, won't I lose the ability to name my field-symbols dynamically?

DEFINE mcr.

field-symbols:<&1> type any.

END-OF-DEFINITION.

DEFINE write_val.

assign wf_ref->* to <&1>.

check <&1> is assigned.

<&1> = '1234'.

write: <&1>.

END-OF-DEFINITION.

Thanks,

Lindsay

Re: Dynamic Variable Declaration

Former Member — Tue, 19 Nov 2013 09:22:53 GMT

DATA r_elemdescr TYPE REF TO cl_abap_elemdescr.

r_elemdescr ?= cl_abap_elemdescr=>describe_by_name( 'DATA_ELEMENT_HERE' ).

DATA r_field TYPE REF TO data.

FIELD-SYMBOLS ‹field› TYPE ANY.

CREATE DATA r_field TYPE HANDLE r_elemdescr.

ASSIGN r_field->* TO ‹field›.

‹field› = .....

"now ‹field› is your dynamic field value