ABAP Select data from SAP table RKAUF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKAUF
*  INTO TABLE @DATA(IT_RKAUF2).
*--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_RKAUF INDEX 1 INTO DATA(WA_RKAUF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKAUF>-KOKRS = 1.
<RKAUF>-VERSN = 1.
<RKAUF>-LEDNR = 1.
<RKAUF>-LDGRP = 1.
<RKAUF>-GJAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKAUF-GJAHR_BIS, sy-vline,
  WA_RKAUF-FROM, sy-vline,
  WA_RKAUF-TO, sy-vline,
  WA_RKAUF-PERIODS, sy-vline,
  WA_RKAUF-ANZBP, sy-vline,
  WA_RKAUF-ANZSP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKAUF 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_RKAUF 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_RKAUF INTO WA_RKAUF.


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

*Conversion exit ALPHA, internal->external for field LEDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKAUF-LEDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKAUF-LEDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKAUF-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKAUF-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR_BIS
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKAUF-GJAHR_BIS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKAUF-GJAHR_BIS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WRTTP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKAUF-WRTTP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKAUF-WRTTP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WORKLIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKAUF-WORKLIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKAUF-WORKLIST.
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_RKAUF_STR, 
KOKRS TYPE STRING,
VERSN TYPE STRING,
LEDNR TYPE STRING,
LDGRP TYPE STRING,
GJAHR TYPE STRING,
GJAHR_BIS TYPE STRING,
FROM TYPE STRING,
TO TYPE STRING,
PERIODS TYPE STRING,
ANZBP TYPE STRING,
ANZSP TYPE STRING,
KWAER TYPE STRING,
ALLEW TYPE STRING,
BOOK TYPE STRING,
STNO TYPE STRING,
PARA TYPE STRING,
DEBUG TYPE STRING,
BATCH TYPE STRING,
REPORT TYPE STRING,
TEST TYPE STRING,
LIST TYPE STRING,
ACT_LOG TYPE STRING,
DIALOG TYPE STRING,
ACHECK TYPE STRING,
PSOSE TYPE STRING,
WAERS TYPE STRING,
KURST TYPE STRING,
WSDAT TYPE STRING,
BUDAT TYPE STRING,
VRGNG TYPE STRING,
WRTTP TYPE STRING,
SIGN_AP TYPE STRING,
SIGN_PSI TYPE STRING,
RFC_GRP TYPE STRING,
TODATE TYPE STRING,
VARIANT TYPE STRING,
BUPERIO TYPE STRING,
VAART TYPE STRING,
BZDAT TYPE STRING,
ERRGR TYPE STRING,
WITEM TYPE STRING,
WF_OKEY TYPE STRING,
WORKLIST TYPE STRING,
STEP TYPE STRING,
NO_OUTPUT_LIST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKAUF_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_RKAUF_STR-KOKRS sy-vline 
WA_RKAUF_STR-VERSN sy-vline 
WA_RKAUF_STR-LEDNR sy-vline 
WA_RKAUF_STR-LDGRP sy-vline 
WA_RKAUF_STR-GJAHR sy-vline 
WA_RKAUF_STR-GJAHR_BIS sy-vline 
WA_RKAUF_STR-FROM sy-vline 
WA_RKAUF_STR-TO sy-vline 
WA_RKAUF_STR-PERIODS sy-vline 
WA_RKAUF_STR-ANZBP sy-vline 
WA_RKAUF_STR-ANZSP sy-vline 
WA_RKAUF_STR-KWAER sy-vline 
WA_RKAUF_STR-ALLEW sy-vline 
WA_RKAUF_STR-BOOK sy-vline 
WA_RKAUF_STR-STNO sy-vline 
WA_RKAUF_STR-PARA sy-vline 
WA_RKAUF_STR-DEBUG sy-vline 
WA_RKAUF_STR-BATCH sy-vline 
WA_RKAUF_STR-REPORT sy-vline 
WA_RKAUF_STR-TEST sy-vline 
WA_RKAUF_STR-LIST sy-vline 
WA_RKAUF_STR-ACT_LOG sy-vline 
WA_RKAUF_STR-DIALOG sy-vline 
WA_RKAUF_STR-ACHECK sy-vline 
WA_RKAUF_STR-PSOSE sy-vline 
WA_RKAUF_STR-WAERS sy-vline 
WA_RKAUF_STR-KURST sy-vline 
WA_RKAUF_STR-WSDAT sy-vline 
WA_RKAUF_STR-BUDAT sy-vline 
WA_RKAUF_STR-VRGNG sy-vline 
WA_RKAUF_STR-WRTTP sy-vline 
WA_RKAUF_STR-SIGN_AP sy-vline 
WA_RKAUF_STR-SIGN_PSI sy-vline 
WA_RKAUF_STR-RFC_GRP sy-vline 
WA_RKAUF_STR-TODATE sy-vline 
WA_RKAUF_STR-VARIANT sy-vline 
WA_RKAUF_STR-BUPERIO sy-vline 
WA_RKAUF_STR-VAART sy-vline 
WA_RKAUF_STR-BZDAT sy-vline 
WA_RKAUF_STR-ERRGR sy-vline 
WA_RKAUF_STR-WITEM sy-vline 
WA_RKAUF_STR-WF_OKEY sy-vline 
WA_RKAUF_STR-WORKLIST sy-vline 
WA_RKAUF_STR-STEP sy-vline 
WA_RKAUF_STR-NO_OUTPUT_LIST sy-vline      INTO ld_text SEPARATED BY SPACE.

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