ABAP Select data from SAP table RNLE2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNLE2 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 RNLE2. 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 RNLE2 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_RNLE2 TYPE STANDARD TABLE OF RNLE2,
      WA_RNLE2 TYPE RNLE2,
      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: <RNLE2> TYPE RNLE2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNLE2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNLE2
  INTO TABLE IT_RNLE2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLE2
*  INTO TABLE @DATA(IT_RNLE22).
*--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_RNLE2 INDEX 1 INTO DATA(WA_RNLE22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNLE2 ASSIGNING <RNLE2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLE2>-ABLST = 1.
<RNLE2>-ABTAR = 1.
<RNLE2>-ABGDT = 1.
<RNLE2>-ANFOE = 1.
<RNLE2>-ANPOE = 1.

ENDLOOP.

LOOP AT IT_RNLE2 INTO WA_RNLE2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLE2-BEGDT, sy-vline,
  WA_RNLE2-BELNR, sy-vline,
  WA_RNLE2-BSTAT, sy-vline,
  WA_RNLE2-DBTRAG, sy-vline,
  WA_RNLE2-DMENGE, sy-vline,
  WA_RNLE2-DPREIS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLE2 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_RNLE2 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_RNLE2 INTO WA_RNLE2.


*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 ABLST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-ABLST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-ABLST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-ABTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-ABTAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANFOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-ANFOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-ANFOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANPOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-ANPOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-ANPOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EITAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-EITAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-EITAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EILST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-EILST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-EILST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ERBOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-ERBOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-ERBOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HAUST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-HAUST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-HAUST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LEIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-LEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-LEIST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRKI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-LNRKI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-LNRKI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-LNRLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFKU
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-REFKU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-REFKU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-TARIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-TARLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-TARLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARSP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE2-TARSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE2-TARSP.
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_RNLE2_STR, 
ABLST TYPE STRING,
ABTAR TYPE STRING,
ABGDT TYPE STRING,
ANFOE TYPE STRING,
ANPOE TYPE STRING,
BEGDT TYPE STRING,
BELNR TYPE STRING,
BSTAT TYPE STRING,
DBTRAG TYPE STRING,
DMENGE TYPE STRING,
DPREIS TYPE STRING,
EITAR TYPE STRING,
EILST TYPE STRING,
ENDDT TYPE STRING,
ERBOE TYPE STRING,
GBTRAG TYPE STRING,
GMENGE TYPE STRING,
GPREIS TYPE STRING,
HAUST TYPE STRING,
KBTRAG TYPE STRING,
KMENGE TYPE STRING,
KPREIS TYPE STRING,
KPROZ TYPE STRING,
KOSTR TYPE STRING,
LEIST TYPE STRING,
LFDBEW TYPE STRING,
LFDNR TYPE STRING,
LINNR TYPE STRING,
LNRKI TYPE STRING,
LNRLS TYPE STRING,
POSNR TYPE STRING,
PSTAT TYPE STRING,
PZUSG TYPE STRING,
REFKU TYPE STRING,
REST TYPE STRING,
SEKZ TYPE STRING,
STATUS TYPE STRING,
TGRKZ TYPE STRING,
TARIF TYPE STRING,
TARLS TYPE STRING,
TARSP TYPE STRING,
TARAS TYPE STRING,
TAXKL TYPE STRING,
TBTRAG TYPE STRING,
UEBAB TYPE STRING,
WAERS TYPE STRING,
ZEITR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLE2_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_RNLE2_STR-ABLST sy-vline 
WA_RNLE2_STR-ABTAR sy-vline 
WA_RNLE2_STR-ABGDT sy-vline 
WA_RNLE2_STR-ANFOE sy-vline 
WA_RNLE2_STR-ANPOE sy-vline 
WA_RNLE2_STR-BEGDT sy-vline 
WA_RNLE2_STR-BELNR sy-vline 
WA_RNLE2_STR-BSTAT sy-vline 
WA_RNLE2_STR-DBTRAG sy-vline 
WA_RNLE2_STR-DMENGE sy-vline 
WA_RNLE2_STR-DPREIS sy-vline 
WA_RNLE2_STR-EITAR sy-vline 
WA_RNLE2_STR-EILST sy-vline 
WA_RNLE2_STR-ENDDT sy-vline 
WA_RNLE2_STR-ERBOE sy-vline 
WA_RNLE2_STR-GBTRAG sy-vline 
WA_RNLE2_STR-GMENGE sy-vline 
WA_RNLE2_STR-GPREIS sy-vline 
WA_RNLE2_STR-HAUST sy-vline 
WA_RNLE2_STR-KBTRAG sy-vline 
WA_RNLE2_STR-KMENGE sy-vline 
WA_RNLE2_STR-KPREIS sy-vline 
WA_RNLE2_STR-KPROZ sy-vline 
WA_RNLE2_STR-KOSTR sy-vline 
WA_RNLE2_STR-LEIST sy-vline 
WA_RNLE2_STR-LFDBEW sy-vline 
WA_RNLE2_STR-LFDNR sy-vline 
WA_RNLE2_STR-LINNR sy-vline 
WA_RNLE2_STR-LNRKI sy-vline 
WA_RNLE2_STR-LNRLS sy-vline 
WA_RNLE2_STR-POSNR sy-vline 
WA_RNLE2_STR-PSTAT sy-vline 
WA_RNLE2_STR-PZUSG sy-vline 
WA_RNLE2_STR-REFKU sy-vline 
WA_RNLE2_STR-REST sy-vline 
WA_RNLE2_STR-SEKZ sy-vline 
WA_RNLE2_STR-STATUS sy-vline 
WA_RNLE2_STR-TGRKZ sy-vline 
WA_RNLE2_STR-TARIF sy-vline 
WA_RNLE2_STR-TARLS sy-vline 
WA_RNLE2_STR-TARSP sy-vline 
WA_RNLE2_STR-TARAS sy-vline 
WA_RNLE2_STR-TAXKL sy-vline 
WA_RNLE2_STR-TBTRAG sy-vline 
WA_RNLE2_STR-UEBAB sy-vline 
WA_RNLE2_STR-WAERS sy-vline 
WA_RNLE2_STR-ZEITR sy-vline      INTO ld_text SEPARATED BY SPACE.

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