ABAP Select data from SAP table RNLE4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNLE4 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 RNLE4. 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 RNLE4 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_RNLE4 TYPE STANDARD TABLE OF RNLE4,
      WA_RNLE4 TYPE RNLE4,
      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: <RNLE4> TYPE RNLE4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNLE4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNLE4
  INTO TABLE IT_RNLE4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLE4
*  INTO TABLE @DATA(IT_RNLE42).
*--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_RNLE4 INDEX 1 INTO DATA(WA_RNLE42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNLE4 ASSIGNING <RNLE4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLE4>-LEIST = 1.
<RNLE4>-LNRLS = 1.
<RNLE4>-LINNR = 1.
<RNLE4>-GRKZ1 = 1.
<RNLE4>-GLEIS = 1.

ENDLOOP.

LOOP AT IT_RNLE4 INTO WA_RNLE4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLE4-GRKZ2, sy-vline,
  WA_RNLE4-ABTAR, sy-vline,
  WA_RNLE4-ABLST, sy-vline,
  WA_RNLE4-EITAR, sy-vline,
  WA_RNLE4-EILST, sy-vline,
  WA_RNLE4-BELNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLE4 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_RNLE4 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_RNLE4 INTO WA_RNLE4.


*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 LEIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-LEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-LEIST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-LNRLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GLEIS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-GLEIS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-GLEIS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-ABTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-ABTAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABLST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-ABLST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-ABLST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EITAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-EITAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-EITAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EILST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-EILST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-EILST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLE4-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLE4-KOSTR.
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_RNLE4_STR, 
LEIST TYPE STRING,
LNRLS TYPE STRING,
LINNR TYPE STRING,
GRKZ1 TYPE STRING,
GLEIS TYPE STRING,
GRKZ2 TYPE STRING,
ABTAR TYPE STRING,
ABLST TYPE STRING,
EITAR TYPE STRING,
EILST TYPE STRING,
BELNR TYPE STRING,
POSNR TYPE STRING,
KOSTR TYPE STRING,
LFDNR TYPE STRING,
TGRKZ TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLE4_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_RNLE4_STR-LEIST sy-vline 
WA_RNLE4_STR-LNRLS sy-vline 
WA_RNLE4_STR-LINNR sy-vline 
WA_RNLE4_STR-GRKZ1 sy-vline 
WA_RNLE4_STR-GLEIS sy-vline 
WA_RNLE4_STR-GRKZ2 sy-vline 
WA_RNLE4_STR-ABTAR sy-vline 
WA_RNLE4_STR-ABLST sy-vline 
WA_RNLE4_STR-EITAR sy-vline 
WA_RNLE4_STR-EILST sy-vline 
WA_RNLE4_STR-BELNR sy-vline 
WA_RNLE4_STR-POSNR sy-vline 
WA_RNLE4_STR-KOSTR sy-vline 
WA_RNLE4_STR-LFDNR sy-vline 
WA_RNLE4_STR-TGRKZ sy-vline 
WA_RNLE4_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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