ABAP Select data from SAP table RNLED into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLED
*  INTO TABLE @DATA(IT_RNLED2).
*--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_RNLED INDEX 1 INTO DATA(WA_RNLED2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLED>-ABRKZ = 1.
<RNLED>-ANFOE = 1.
<RNLED>-ERBOE = 1.
<RNLED>-FALKZ = 1.
<RNLED>-LEBIS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLED-LEIST, sy-vline,
  WA_RNLED-LEITX, sy-vline,
  WA_RNLED-LEVON, sy-vline,
  WA_RNLED-LGTXT, sy-vline,
  WA_RNLED-LNRLS, sy-vline,
  WA_RNLED-MARK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLED 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_RNLED 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_RNLED INTO WA_RNLED.


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

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

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

*Conversion exit ALPHA, internal->external for field LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLED-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLED-LNRLS.
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_RNLED_STR, 
ABRKZ TYPE STRING,
ANFOE TYPE STRING,
ERBOE TYPE STRING,
FALKZ TYPE STRING,
LEBIS TYPE STRING,
LEIST TYPE STRING,
LEITX TYPE STRING,
LEVON TYPE STRING,
LGTXT TYPE STRING,
LNRLS TYPE STRING,
MARK TYPE STRING,
MENGE TYPE STRING,
STALS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLED_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_RNLED_STR-ABRKZ sy-vline 
WA_RNLED_STR-ANFOE sy-vline 
WA_RNLED_STR-ERBOE sy-vline 
WA_RNLED_STR-FALKZ sy-vline 
WA_RNLED_STR-LEBIS sy-vline 
WA_RNLED_STR-LEIST sy-vline 
WA_RNLED_STR-LEITX sy-vline 
WA_RNLED_STR-LEVON sy-vline 
WA_RNLED_STR-LGTXT sy-vline 
WA_RNLED_STR-LNRLS sy-vline 
WA_RNLED_STR-MARK sy-vline 
WA_RNLED_STR-MENGE sy-vline 
WA_RNLED_STR-STALS sy-vline      INTO ld_text SEPARATED BY SPACE.

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