ABAP Select data from SAP table DXFIELDS into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DXFIELDS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to DXFIELDS. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the DXFIELDS table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_DXFIELDS TYPE STANDARD TABLE OF DXFIELDS,
      WA_DXFIELDS TYPE DXFIELDS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <DXFIELDS> TYPE DXFIELDS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DXFIELDS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DXFIELDS
  INTO TABLE IT_DXFIELDS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DXFIELDS
*  INTO TABLE @DATA(IT_DXFIELDS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_DXFIELDS INDEX 1 INTO DATA(WA_DXFIELDS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DXFIELDS ASSIGNING <DXFIELDS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DXFIELDS>-METHOD = 1.
<DXFIELDS>-ALEINB = 1.
<DXFIELDS>-REPORT = 1.
<DXFIELDS>-FUNCTION = 1.
<DXFIELDS>-BIREPORT = 1.

ENDLOOP.

LOOP AT IT_DXFIELDS INTO WA_DXFIELDS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DXFIELDS-EXTRPRG, sy-vline,
  WA_DXFIELDS-PROJECT, sy-vline,
  WA_DXFIELDS-SUBPROJECT, sy-vline,
  WA_DXFIELDS-RUNDEF, sy-vline,
  WA_DXFIELDS-RUNID, sy-vline,
  WA_DXFIELDS-ERRFILE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DXFIELDS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_DXFIELDS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_DXFIELDS INTO WA_DXFIELDS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DXFIELDS-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DXFIELDS-LOGSYS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DXFIELDS_STR, 
METHOD TYPE STRING,
ALEINB TYPE STRING,
REPORT TYPE STRING,
FUNCTION TYPE STRING,
BIREPORT TYPE STRING,
EXTRPRG TYPE STRING,
PROJECT TYPE STRING,
SUBPROJECT TYPE STRING,
RUNDEF TYPE STRING,
RUNID TYPE STRING,
ERRFILE TYPE STRING,
EXIST TYPE STRING,
DIALOG TYPE STRING,
CHECKBOX TYPE STRING,
RETTYP TYPE STRING,
THREADNO TYPE STRING,
PARALLEL TYPE STRING,
SERIELL TYPE STRING,
LOCATION TYPE STRING,
FILEOPER TYPE STRING,
ABENDFLAG TYPE STRING,
LONGPATH TYPE STRING,
FILEMASK TYPE STRING,
FILEEXFLAG TYPE STRING,
XMASSPRC TYPE STRING,
DIRECTION TYPE STRING,
LOGSYS TYPE STRING,
OBJTEXT TYPE STRING,
ERRREC TYPE STRING,
SPLITF TYPE STRING,
SPLITL TYPE STRING,
SPLITR TYPE STRING,
LOGHANDLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DXFIELDS_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_DXFIELDS_STR-METHOD sy-vline 
WA_DXFIELDS_STR-ALEINB sy-vline 
WA_DXFIELDS_STR-REPORT sy-vline 
WA_DXFIELDS_STR-FUNCTION sy-vline 
WA_DXFIELDS_STR-BIREPORT sy-vline 
WA_DXFIELDS_STR-EXTRPRG sy-vline 
WA_DXFIELDS_STR-PROJECT sy-vline 
WA_DXFIELDS_STR-SUBPROJECT sy-vline 
WA_DXFIELDS_STR-RUNDEF sy-vline 
WA_DXFIELDS_STR-RUNID sy-vline 
WA_DXFIELDS_STR-ERRFILE sy-vline 
WA_DXFIELDS_STR-EXIST sy-vline 
WA_DXFIELDS_STR-DIALOG sy-vline 
WA_DXFIELDS_STR-CHECKBOX sy-vline 
WA_DXFIELDS_STR-RETTYP sy-vline 
WA_DXFIELDS_STR-THREADNO sy-vline 
WA_DXFIELDS_STR-PARALLEL sy-vline 
WA_DXFIELDS_STR-SERIELL sy-vline 
WA_DXFIELDS_STR-LOCATION sy-vline 
WA_DXFIELDS_STR-FILEOPER sy-vline 
WA_DXFIELDS_STR-ABENDFLAG sy-vline 
WA_DXFIELDS_STR-LONGPATH sy-vline 
WA_DXFIELDS_STR-FILEMASK sy-vline 
WA_DXFIELDS_STR-FILEEXFLAG sy-vline 
WA_DXFIELDS_STR-XMASSPRC sy-vline 
WA_DXFIELDS_STR-DIRECTION sy-vline 
WA_DXFIELDS_STR-LOGSYS sy-vline 
WA_DXFIELDS_STR-OBJTEXT sy-vline 
WA_DXFIELDS_STR-ERRREC sy-vline 
WA_DXFIELDS_STR-SPLITF sy-vline 
WA_DXFIELDS_STR-SPLITL sy-vline 
WA_DXFIELDS_STR-SPLITR sy-vline 
WA_DXFIELDS_STR-LOGHANDLE sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.