ABAP Select data from SAP table AFWCH_FLD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP AFWCH_FLD 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 AFWCH_FLD. 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 AFWCH_FLD 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_AFWCH_FLD TYPE STANDARD TABLE OF AFWCH_FLD,
      WA_AFWCH_FLD TYPE AFWCH_FLD,
      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: <AFWCH_FLD> TYPE AFWCH_FLD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AFWCH_FLD
*  INTO TABLE @DATA(IT_AFWCH_FLD2).
*--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_AFWCH_FLD INDEX 1 INTO DATA(WA_AFWCH_FLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AFWCH_FLD>-MANDT = 1.
<AFWCH_FLD>-FLID = 1.
<AFWCH_FLD>-FIELDNAME = 1.
<AFWCH_FLD>-SELINDEX = 1.
<AFWCH_FLD>-SELGROUP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AFWCH_FLD-SIGN, sy-vline,
  WA_AFWCH_FLD-OPTI, sy-vline,
  WA_AFWCH_FLD-LOW, sy-vline,
  WA_AFWCH_FLD-HIGH, sy-vline,
  WA_AFWCH_FLD-TRKORR, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_AFWCH_FLD 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_AFWCH_FLD 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_AFWCH_FLD INTO WA_AFWCH_FLD.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_AFWCH_FLD_STR, 
MANDT TYPE STRING,
FLID TYPE STRING,
FIELDNAME TYPE STRING,
SELINDEX TYPE STRING,
SELGROUP TYPE STRING,
SIGN TYPE STRING,
OPTI TYPE STRING,
LOW TYPE STRING,
HIGH TYPE STRING,
TRKORR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AFWCH_FLD_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_AFWCH_FLD_STR-MANDT sy-vline 
WA_AFWCH_FLD_STR-FLID sy-vline 
WA_AFWCH_FLD_STR-FIELDNAME sy-vline 
WA_AFWCH_FLD_STR-SELINDEX sy-vline 
WA_AFWCH_FLD_STR-SELGROUP sy-vline 
WA_AFWCH_FLD_STR-SIGN sy-vline 
WA_AFWCH_FLD_STR-OPTI sy-vline 
WA_AFWCH_FLD_STR-LOW sy-vline 
WA_AFWCH_FLD_STR-HIGH sy-vline 
WA_AFWCH_FLD_STR-TRKORR sy-vline      INTO ld_text SEPARATED BY SPACE.

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