ABAP Select data from SAP table RKAB1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKAB1 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 RKAB1. 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 RKAB1 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_RKAB1 TYPE STANDARD TABLE OF RKAB1,
      WA_RKAB1 TYPE RKAB1,
      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: <RKAB1> TYPE RKAB1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKAB1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKAB1
  INTO TABLE IT_RKAB1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKAB1
*  INTO TABLE @DATA(IT_RKAB12).
*--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_RKAB1 INDEX 1 INTO DATA(WA_RKAB12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKAB1 ASSIGNING <RKAB1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKAB1>-CPAGE = 1.
<RKAB1>-TPAGE = 1.
<RKAB1>-TEXT40 = 1.
<RKAB1>-LTEXT = 1.
<RKAB1>-XDESC = 1.

ENDLOOP.

LOOP AT IT_RKAB1 INTO WA_RKAB1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKAB1-XSUMA, sy-vline,
  WA_RKAB1-SRTFO, sy-vline,
  WA_RKAB1-VRBEZ, sy-vline,
  WA_RKAB1-AKT_VRBEZ, sy-vline,
  WA_RKAB1-VARNR, sy-vline,
  WA_RKAB1-VONSL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKAB1 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_RKAB1 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_RKAB1 INTO WA_RKAB1.


*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_RKAB1_STR, 
CPAGE TYPE STRING,
TPAGE TYPE STRING,
TEXT40 TYPE STRING,
LTEXT TYPE STRING,
XDESC TYPE STRING,
XSUMA TYPE STRING,
SRTFO TYPE STRING,
VRBEZ TYPE STRING,
AKT_VRBEZ TYPE STRING,
VARNR TYPE STRING,
VONSL TYPE STRING,
BISSL TYPE STRING,
XINIT TYPE STRING,
XSTRG TYPE STRING,
XSUCH TYPE STRING,
TEXT1 TYPE STRING,
TEXT2 TYPE STRING,
TEXT3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKAB1_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_RKAB1_STR-CPAGE sy-vline 
WA_RKAB1_STR-TPAGE sy-vline 
WA_RKAB1_STR-TEXT40 sy-vline 
WA_RKAB1_STR-LTEXT sy-vline 
WA_RKAB1_STR-XDESC sy-vline 
WA_RKAB1_STR-XSUMA sy-vline 
WA_RKAB1_STR-SRTFO sy-vline 
WA_RKAB1_STR-VRBEZ sy-vline 
WA_RKAB1_STR-AKT_VRBEZ sy-vline 
WA_RKAB1_STR-VARNR sy-vline 
WA_RKAB1_STR-VONSL sy-vline 
WA_RKAB1_STR-BISSL sy-vline 
WA_RKAB1_STR-XINIT sy-vline 
WA_RKAB1_STR-XSTRG sy-vline 
WA_RKAB1_STR-XSUCH sy-vline 
WA_RKAB1_STR-TEXT1 sy-vline 
WA_RKAB1_STR-TEXT2 sy-vline 
WA_RKAB1_STR-TEXT3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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