ABAP Select data from SAP table AFWCH_FLD_BK 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_BK 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_BK. 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_BK 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_BK TYPE STANDARD TABLE OF AFWCH_FLD_BK,
      WA_AFWCH_FLD_BK TYPE AFWCH_FLD_BK,
      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_BK> TYPE AFWCH_FLD_BK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AFWCH_FLD_BK
*  INTO TABLE @DATA(IT_AFWCH_FLD_BK2).
*--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_BK INDEX 1 INTO DATA(WA_AFWCH_FLD_BK2).


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

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

ENDLOOP.

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

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


*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_BK_STR, 
MANDT TYPE STRING,
FLID TYPE STRING,
VARIANTE TYPE STRING,
FIELDNAME TYPE STRING,
SELINDEX TYPE STRING,
SELGROUP TYPE STRING,
SIGN TYPE STRING,
OPTI TYPE STRING,
LOW TYPE STRING,
HIGH TYPE STRING,
BKTSTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AFWCH_FLD_BK_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_BK_STR-MANDT sy-vline 
WA_AFWCH_FLD_BK_STR-FLID sy-vline 
WA_AFWCH_FLD_BK_STR-VARIANTE sy-vline 
WA_AFWCH_FLD_BK_STR-FIELDNAME sy-vline 
WA_AFWCH_FLD_BK_STR-SELINDEX sy-vline 
WA_AFWCH_FLD_BK_STR-SELGROUP sy-vline 
WA_AFWCH_FLD_BK_STR-SIGN sy-vline 
WA_AFWCH_FLD_BK_STR-OPTI sy-vline 
WA_AFWCH_FLD_BK_STR-LOW sy-vline 
WA_AFWCH_FLD_BK_STR-HIGH sy-vline 
WA_AFWCH_FLD_BK_STR-BKTSTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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