ABAP Select data from SAP table RNLRG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLRG
*  INTO TABLE @DATA(IT_RNLRG2).
*--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_RNLRG INDEX 1 INTO DATA(WA_RNLRG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLRG>-RGART = 1.
<RNLRG>-LFDAK = 1.
<RNLRG>-AKTION = 1.
<RNLRG>-GPART = 1.
<RNLRG>-ROLTP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLRG-BETRAG, sy-vline,
  WA_RNLRG-BETRAG_X, sy-vline,
  WA_RNLRG-PROZENT, sy-vline,
  WA_RNLRG-PROZENT_X, sy-vline,
  WA_RNLRG-AEQUI, sy-vline,
  WA_RNLRG-AEQUI_X, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLRG 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_RNLRG 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_RNLRG INTO WA_RNLRG.


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field ASHOSP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLRG-ASHOSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLRG-ASHOSP.
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_RNLRG_STR, 
RGART TYPE STRING,
LFDAK TYPE STRING,
AKTION TYPE STRING,
GPART TYPE STRING,
ROLTP TYPE STRING,
BETRAG TYPE STRING,
BETRAG_X TYPE STRING,
PROZENT TYPE STRING,
PROZENT_X TYPE STRING,
AEQUI TYPE STRING,
AEQUI_X TYPE STRING,
ASSTP TYPE STRING,
ASSTP_X TYPE STRING,
KZPRF TYPE STRING,
KZPRF_X TYPE STRING,
KZEAH TYPE STRING,
KZEAH_X TYPE STRING,
KZEXT TYPE STRING,
KZEXT_X TYPE STRING,
ASHOSP TYPE STRING,
ASHOSP_X TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLRG_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_RNLRG_STR-RGART sy-vline 
WA_RNLRG_STR-LFDAK sy-vline 
WA_RNLRG_STR-AKTION sy-vline 
WA_RNLRG_STR-GPART sy-vline 
WA_RNLRG_STR-ROLTP sy-vline 
WA_RNLRG_STR-BETRAG sy-vline 
WA_RNLRG_STR-BETRAG_X sy-vline 
WA_RNLRG_STR-PROZENT sy-vline 
WA_RNLRG_STR-PROZENT_X sy-vline 
WA_RNLRG_STR-AEQUI sy-vline 
WA_RNLRG_STR-AEQUI_X sy-vline 
WA_RNLRG_STR-ASSTP sy-vline 
WA_RNLRG_STR-ASSTP_X sy-vline 
WA_RNLRG_STR-KZPRF sy-vline 
WA_RNLRG_STR-KZPRF_X sy-vline 
WA_RNLRG_STR-KZEAH sy-vline 
WA_RNLRG_STR-KZEAH_X sy-vline 
WA_RNLRG_STR-KZEXT sy-vline 
WA_RNLRG_STR-KZEXT_X sy-vline 
WA_RNLRG_STR-ASHOSP sy-vline 
WA_RNLRG_STR-ASHOSP_X sy-vline      INTO ld_text SEPARATED BY SPACE.

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