ABAP Select data from SAP table RHKB1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RHKB1 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 RHKB1. 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 RHKB1 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_RHKB1 TYPE STANDARD TABLE OF RHKB1,
      WA_RHKB1 TYPE RHKB1,
      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: <RHKB1> TYPE RHKB1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RHKB1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RHKB1
  INTO TABLE IT_RHKB1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RHKB1
*  INTO TABLE @DATA(IT_RHKB12).
*--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_RHKB1 INDEX 1 INTO DATA(WA_RHKB12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RHKB1 ASSIGNING <RHKB1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RHKB1>-PLVAR = 1.
<RHKB1>-EOTYP = 1.
<RHKB1>-EVEID = 1.
<RHKB1>-ISTAT = 1.
<RHKB1>-KOBES = 1.

ENDLOOP.

LOOP AT IT_RHKB1 INTO WA_RHKB1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RHKB1-KOBTX, sy-vline,
  WA_RHKB1-PRICE, sy-vline,
  WA_RHKB1-WAERS, sy-vline,
  WA_RHKB1-KSTAR, sy-vline,
  WA_RHKB1-KOKRS, sy-vline,
  WA_RHKB1-OTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RHKB1 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_RHKB1 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_RHKB1 INTO WA_RHKB1.


*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 KSTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RHKB1-KSTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RHKB1-KSTAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BZGME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RHKB1-BZGME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RHKB1-BZGME.
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_RHKB1_STR, 
PLVAR TYPE STRING,
EOTYP TYPE STRING,
EVEID TYPE STRING,
ISTAT TYPE STRING,
KOBES TYPE STRING,
KOBTX TYPE STRING,
PRICE TYPE STRING,
WAERS TYPE STRING,
KSTAR TYPE STRING,
KOKRS TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
AMTYP TYPE STRING,
ROTYP TYPE STRING,
RTYID TYPE STRING,
DISPO TYPE STRING,
NDAYS TYPE STRING,
NSECO TYPE STRING,
BUNIT TYPE STRING,
BZGME TYPE STRING,
NOTRA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RHKB1_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_RHKB1_STR-PLVAR sy-vline 
WA_RHKB1_STR-EOTYP sy-vline 
WA_RHKB1_STR-EVEID sy-vline 
WA_RHKB1_STR-ISTAT sy-vline 
WA_RHKB1_STR-KOBES sy-vline 
WA_RHKB1_STR-KOBTX sy-vline 
WA_RHKB1_STR-PRICE sy-vline 
WA_RHKB1_STR-WAERS sy-vline 
WA_RHKB1_STR-KSTAR sy-vline 
WA_RHKB1_STR-KOKRS sy-vline 
WA_RHKB1_STR-OTYPE sy-vline 
WA_RHKB1_STR-OBJID sy-vline 
WA_RHKB1_STR-AMTYP sy-vline 
WA_RHKB1_STR-ROTYP sy-vline 
WA_RHKB1_STR-RTYID sy-vline 
WA_RHKB1_STR-DISPO sy-vline 
WA_RHKB1_STR-NDAYS sy-vline 
WA_RHKB1_STR-NSECO sy-vline 
WA_RHKB1_STR-BUNIT sy-vline 
WA_RHKB1_STR-BZGME sy-vline 
WA_RHKB1_STR-NOTRA sy-vline      INTO ld_text SEPARATED BY SPACE.

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