ABAP Select data from SAP table RKB1S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKB1S 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 RKB1S. 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 RKB1S 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_RKB1S TYPE STANDARD TABLE OF RKB1S,
      WA_RKB1S TYPE RKB1S,
      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: <RKB1S> TYPE RKB1S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKB1S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKB1S
  INTO TABLE IT_RKB1S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKB1S
*  INTO TABLE @DATA(IT_RKB1S2).
*--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_RKB1S INDEX 1 INTO DATA(WA_RKB1S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKB1S ASSIGNING <RKB1S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKB1S>-MANDT = 1.
<RKB1S>-APPLCLASS = 1.
<RKB1S>-SUBCLASS = 1.
<RKB1S>-TABNAME = 1.
<RKB1S>-FORM = 1.

ENDLOOP.

LOOP AT IT_RKB1S INTO WA_RKB1S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKB1S-SUBNR, sy-vline,
  WA_RKB1S-EDIM, sy-vline,
  WA_RKB1S-FLEVEL, sy-vline,
  WA_RKB1S-SUBNRL1, sy-vline,
  WA_RKB1S-FART, sy-vline,
  WA_RKB1S-FTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKB1S 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_RKB1S 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_RKB1S INTO WA_RKB1S.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RKB1S-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKB1S-SPRAS.
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_RKB1S_STR, 
MANDT TYPE STRING,
APPLCLASS TYPE STRING,
SUBCLASS TYPE STRING,
TABNAME TYPE STRING,
FORM TYPE STRING,
SUBNR TYPE STRING,
EDIM TYPE STRING,
FLEVEL TYPE STRING,
SUBNRL1 TYPE STRING,
FART TYPE STRING,
FTYP TYPE STRING,
ROWCOL TYPE STRING,
CUA_STATUS TYPE STRING,
LPAGE TYPE STRING,
FPAGE TYPE STRING,
HPAGE TYPE STRING,
SEL_STRUC1 TYPE STRING,
SEL_STRUC2 TYPE STRING,
ELNR1 TYPE STRING,
ELNR2 TYPE STRING,
ELTYP TYPE STRING,
ELTYPF TYPE STRING,
SPRAS TYPE STRING,
TXTKZ TYPE STRING,
TXTMT TYPE STRING,
TXTLG TYPE STRING,
POINTER TYPE STRING,
ELTYP1 TYPE STRING,
ELTYP2 TYPE STRING,
VERSO TYPE STRING,
TABNM TYPE STRING,
TFORM TYPE STRING,
RSUBCLASS TYPE STRING,
RTFORM TYPE STRING,
DEFAU TYPE STRING,
DEFAUB TYPE STRING,
TABNAMEB TYPE STRING,
SETSORT TYPE STRING,
ZROLLNAME TYPE STRING,
ZTABNAME TYPE STRING,
ZFIELDNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKB1S_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_RKB1S_STR-MANDT sy-vline 
WA_RKB1S_STR-APPLCLASS sy-vline 
WA_RKB1S_STR-SUBCLASS sy-vline 
WA_RKB1S_STR-TABNAME sy-vline 
WA_RKB1S_STR-FORM sy-vline 
WA_RKB1S_STR-SUBNR sy-vline 
WA_RKB1S_STR-EDIM sy-vline 
WA_RKB1S_STR-FLEVEL sy-vline 
WA_RKB1S_STR-SUBNRL1 sy-vline 
WA_RKB1S_STR-FART sy-vline 
WA_RKB1S_STR-FTYP sy-vline 
WA_RKB1S_STR-ROWCOL sy-vline 
WA_RKB1S_STR-CUA_STATUS sy-vline 
WA_RKB1S_STR-LPAGE sy-vline 
WA_RKB1S_STR-FPAGE sy-vline 
WA_RKB1S_STR-HPAGE sy-vline 
WA_RKB1S_STR-SEL_STRUC1 sy-vline 
WA_RKB1S_STR-SEL_STRUC2 sy-vline 
WA_RKB1S_STR-ELNR1 sy-vline 
WA_RKB1S_STR-ELNR2 sy-vline 
WA_RKB1S_STR-ELTYP sy-vline 
WA_RKB1S_STR-ELTYPF sy-vline 
WA_RKB1S_STR-SPRAS sy-vline 
WA_RKB1S_STR-TXTKZ sy-vline 
WA_RKB1S_STR-TXTMT sy-vline 
WA_RKB1S_STR-TXTLG sy-vline 
WA_RKB1S_STR-POINTER sy-vline 
WA_RKB1S_STR-ELTYP1 sy-vline 
WA_RKB1S_STR-ELTYP2 sy-vline 
WA_RKB1S_STR-VERSO sy-vline 
WA_RKB1S_STR-TABNM sy-vline 
WA_RKB1S_STR-TFORM sy-vline 
WA_RKB1S_STR-RSUBCLASS sy-vline 
WA_RKB1S_STR-RTFORM sy-vline 
WA_RKB1S_STR-DEFAU sy-vline 
WA_RKB1S_STR-DEFAUB sy-vline 
WA_RKB1S_STR-TABNAMEB sy-vline 
WA_RKB1S_STR-SETSORT sy-vline 
WA_RKB1S_STR-ZROLLNAME sy-vline 
WA_RKB1S_STR-ZTABNAME sy-vline 
WA_RKB1S_STR-ZFIELDNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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