ABAP Select data from SAP table RNKTR into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNKTR 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 RNKTR. 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 RNKTR 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_RNKTR TYPE STANDARD TABLE OF RNKTR,
      WA_RNKTR TYPE RNKTR,
      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: <RNKTR> TYPE RNKTR.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNKTR
*  INTO TABLE @DATA(IT_RNKTR2).
*--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_RNKTR INDEX 1 INTO DATA(WA_RNKTR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNKTR>-MANDT = 1.
<RNKTR>-KOSTR = 1.
<RNKTR>-KTTYP = 1.
<RNKTR>-KTART = 1.
<RNKTR>-ARTPA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNKTR-ZENTR, sy-vline,
  WA_RNKTR-KKSNR, sy-vline,
  WA_RNKTR-KVNUM, sy-vline,
  WA_RNKTR-KKSVA, sy-vline,
  WA_RNKTR-KZTXT, sy-vline,
  WA_RNKTR-LGTXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNKTR 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_RNKTR 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_RNKTR INTO WA_RNKTR.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field KKSVA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKTR-KKSVA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKTR-KKSVA.
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_RNKTR_STR, 
MANDT TYPE STRING,
KOSTR TYPE STRING,
KTTYP TYPE STRING,
KTART TYPE STRING,
ARTPA TYPE STRING,
ZENTR TYPE STRING,
KKSNR TYPE STRING,
KVNUM TYPE STRING,
KKSVA TYPE STRING,
KZTXT TYPE STRING,
LGTXT TYPE STRING,
KONT1 TYPE STRING,
KONT2 TYPE STRING,
KUEVER TYPE STRING,
REBEA TYPE STRING,
SAMRE TYPE STRING,
ZWIAB TYPE STRING,
SORTR TYPE STRING,
ABRLS TYPE STRING,
ENDLS TYPE STRING,
ENDAB TYPE STRING,
SEPRE TYPE STRING,
ABRTG TYPE STRING,
ABRIN TYPE STRING,
RHYTH TYPE STRING,
KUEMAH TYPE STRING,
KUEMF TYPE STRING,
KUEVS TYPE STRING,
DIADR TYPE STRING,
AAZKZ TYPE STRING,
ENTAZ TYPE STRING,
VKUAN TYPE STRING,
KUANZ TYPE STRING,
PFLZZ TYPE STRING,
VERZZ TYPE STRING,
STTAG TYPE STRING,
WAERS TYPE STRING,
LOEKZ TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
TAXKD TYPE STRING,
PM301 TYPE STRING,
ABREL TYPE STRING,
POSTK TYPE STRING,
KSSNM TYPE STRING,
KSSNS TYPE STRING,
KUALF TYPE STRING,
KUCODE TYPE STRING,
EANR TYPE STRING,
RDRUCK TYPE STRING,
KNULLR TYPE STRING,
TPPROC TYPE STRING,
SVERS TYPE STRING,
ABRLF TYPE STRING,
INSTLKF TYPE STRING,
MIG_DONE TYPE STRING,
/ISHFR/COMP_INS TYPE STRING,
/ISHFR/ELSASS TYPE STRING,
/ISHFR/LIMPDVTY TYPE STRING,
/ISHFR/WODAYFR TYPE STRING,
/ISHFR/HIST TYPE STRING,
/ISHFR/COUNC_GEN TYPE STRING,
PSIGN TYPE STRING,
BAG TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNKTR_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_RNKTR_STR-MANDT sy-vline 
WA_RNKTR_STR-KOSTR sy-vline 
WA_RNKTR_STR-KTTYP sy-vline 
WA_RNKTR_STR-KTART sy-vline 
WA_RNKTR_STR-ARTPA sy-vline 
WA_RNKTR_STR-ZENTR sy-vline 
WA_RNKTR_STR-KKSNR sy-vline 
WA_RNKTR_STR-KVNUM sy-vline 
WA_RNKTR_STR-KKSVA sy-vline 
WA_RNKTR_STR-KZTXT sy-vline 
WA_RNKTR_STR-LGTXT sy-vline 
WA_RNKTR_STR-KONT1 sy-vline 
WA_RNKTR_STR-KONT2 sy-vline 
WA_RNKTR_STR-KUEVER sy-vline 
WA_RNKTR_STR-REBEA sy-vline 
WA_RNKTR_STR-SAMRE sy-vline 
WA_RNKTR_STR-ZWIAB sy-vline 
WA_RNKTR_STR-SORTR sy-vline 
WA_RNKTR_STR-ABRLS sy-vline 
WA_RNKTR_STR-ENDLS sy-vline 
WA_RNKTR_STR-ENDAB sy-vline 
WA_RNKTR_STR-SEPRE sy-vline 
WA_RNKTR_STR-ABRTG sy-vline 
WA_RNKTR_STR-ABRIN sy-vline 
WA_RNKTR_STR-RHYTH sy-vline 
WA_RNKTR_STR-KUEMAH sy-vline 
WA_RNKTR_STR-KUEMF sy-vline 
WA_RNKTR_STR-KUEVS sy-vline 
WA_RNKTR_STR-DIADR sy-vline 
WA_RNKTR_STR-AAZKZ sy-vline 
WA_RNKTR_STR-ENTAZ sy-vline 
WA_RNKTR_STR-VKUAN sy-vline 
WA_RNKTR_STR-KUANZ sy-vline 
WA_RNKTR_STR-PFLZZ sy-vline 
WA_RNKTR_STR-VERZZ sy-vline 
WA_RNKTR_STR-STTAG sy-vline 
WA_RNKTR_STR-WAERS sy-vline 
WA_RNKTR_STR-LOEKZ sy-vline 
WA_RNKTR_STR-LOUSR sy-vline 
WA_RNKTR_STR-LODAT sy-vline 
WA_RNKTR_STR-ERDAT sy-vline 
WA_RNKTR_STR-ERUSR sy-vline 
WA_RNKTR_STR-UPDAT sy-vline 
WA_RNKTR_STR-UPUSR sy-vline 
WA_RNKTR_STR-TAXKD sy-vline 
WA_RNKTR_STR-PM301 sy-vline 
WA_RNKTR_STR-ABREL sy-vline 
WA_RNKTR_STR-POSTK sy-vline 
WA_RNKTR_STR-KSSNM sy-vline 
WA_RNKTR_STR-KSSNS sy-vline 
WA_RNKTR_STR-KUALF sy-vline 
WA_RNKTR_STR-KUCODE sy-vline 
WA_RNKTR_STR-EANR sy-vline 
WA_RNKTR_STR-RDRUCK sy-vline 
WA_RNKTR_STR-KNULLR sy-vline 
WA_RNKTR_STR-TPPROC sy-vline 
WA_RNKTR_STR-SVERS sy-vline 
WA_RNKTR_STR-ABRLF sy-vline 
WA_RNKTR_STR-INSTLKF sy-vline 
WA_RNKTR_STR-MIG_DONE sy-vline 
WA_RNKTR_STR-/ISHFR/COMP_INS sy-vline 
WA_RNKTR_STR-/ISHFR/ELSASS sy-vline 
WA_RNKTR_STR-/ISHFR/LIMPDVTY sy-vline 
WA_RNKTR_STR-/ISHFR/WODAYFR sy-vline 
WA_RNKTR_STR-/ISHFR/HIST sy-vline 
WA_RNKTR_STR-/ISHFR/COUNC_GEN sy-vline 
WA_RNKTR_STR-PSIGN sy-vline 
WA_RNKTR_STR-BAG sy-vline 
WA_RNKTR_STR-NAME1 sy-vline 
WA_RNKTR_STR-NAME2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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