ABAP Select data from SAP table RNLEF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLEF
*  INTO TABLE @DATA(IT_RNLEF2).
*--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_RNLEF INDEX 1 INTO DATA(WA_RNLEF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLEF>-ABGER = 1.
<RNLEF>-ABRKZ = 1.
<RNLEF>-DATAB = 1.
<RNLEF>-DATBI = 1.
<RNLEF>-INSERT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLEF-LSPLAN, sy-vline,
  WA_RNLEF-LSIST, sy-vline,
  WA_RNLEF-NABGER, sy-vline,
  WA_RNLEF-NABRKZ, sy-vline,
  WA_RNLEF-UPDATE, sy-vline,
  WA_RNLEF-STORN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLEF 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_RNLEF 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_RNLEF INTO WA_RNLEF.


*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_RNLEF-LEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLEF-LEIST.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field ERBOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLEF-ERBOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLEF-ERBOE.
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_RNLEF_STR, 
ABGER TYPE STRING,
ABRKZ TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
INSERT TYPE STRING,
LSPLAN TYPE STRING,
LSIST TYPE STRING,
NABGER TYPE STRING,
NABRKZ TYPE STRING,
UPDATE TYPE STRING,
STORN TYPE STRING,
NSTOR TYPE STRING,
HCOREL TYPE STRING,
HCONRE TYPE STRING,
LEIST TYPE STRING,
ANFOE TYPE STRING,
ERBOE TYPE STRING,
MEDLS TYPE STRING,
MOVEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLEF_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_RNLEF_STR-ABGER sy-vline 
WA_RNLEF_STR-ABRKZ sy-vline 
WA_RNLEF_STR-DATAB sy-vline 
WA_RNLEF_STR-DATBI sy-vline 
WA_RNLEF_STR-INSERT sy-vline 
WA_RNLEF_STR-LSPLAN sy-vline 
WA_RNLEF_STR-LSIST sy-vline 
WA_RNLEF_STR-NABGER sy-vline 
WA_RNLEF_STR-NABRKZ sy-vline 
WA_RNLEF_STR-UPDATE sy-vline 
WA_RNLEF_STR-STORN sy-vline 
WA_RNLEF_STR-NSTOR sy-vline 
WA_RNLEF_STR-HCOREL sy-vline 
WA_RNLEF_STR-HCONRE sy-vline 
WA_RNLEF_STR-LEIST sy-vline 
WA_RNLEF_STR-ANFOE sy-vline 
WA_RNLEF_STR-ERBOE sy-vline 
WA_RNLEF_STR-MEDLS sy-vline 
WA_RNLEF_STR-MOVEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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