ABAP Select data from SAP table RNLCCOMP into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNLCCOMP 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 RNLCCOMP. 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 RNLCCOMP 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_RNLCCOMP TYPE STANDARD TABLE OF RNLCCOMP,
      WA_RNLCCOMP TYPE RNLCCOMP,
      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: <RNLCCOMP> TYPE RNLCCOMP.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLCCOMP
*  INTO TABLE @DATA(IT_RNLCCOMP2).
*--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_RNLCCOMP INDEX 1 INTO DATA(WA_RNLCCOMP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLCCOMP>-DATUM = 1.
<RNLCCOMP>-TARID = 1.
<RNLCCOMP>-TARSP = 1.
<RNLCCOMP>-FPID = 1.
<RNLCCOMP>-FPID2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLCCOMP-SEID, sy-vline,
  WA_RNLCCOMP-SEID2, sy-vline,
  WA_RNLCCOMP-DAUER, sy-vline,
  WA_RNLCCOMP-AUFDT, sy-vline,
  WA_RNLCCOMP-ENDDT, sy-vline,
  WA_RNLCCOMP-ETLDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLCCOMP 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_RNLCCOMP 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_RNLCCOMP INTO WA_RNLCCOMP.


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

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

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

*Conversion exit ALPHA, internal->external for field FPID2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLCCOMP-FPID2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLCCOMP-FPID2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field SEID2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLCCOMP-SEID2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLCCOMP-SEID2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DRG1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLCCOMP-DRG1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLCCOMP-DRG1.
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_RNLCCOMP_STR, 
DATUM TYPE STRING,
TARID TYPE STRING,
TARSP TYPE STRING,
FPID TYPE STRING,
FPID2 TYPE STRING,
SEID TYPE STRING,
SEID2 TYPE STRING,
DAUER TYPE STRING,
AUFDT TYPE STRING,
ENDDT TYPE STRING,
ETLDT TYPE STRING,
CCTEXT1 TYPE STRING,
CCTEXT2 TYPE STRING,
CCTEXT3 TYPE STRING,
CCTEXT4 TYPE STRING,
CCTEXT5 TYPE STRING,
CCTEXT6 TYPE STRING,
BRUWR1 TYPE STRING,
WAERS1 TYPE STRING,
BRUWR2 TYPE STRING,
WAERS2 TYPE STRING,
BRUWR3 TYPE STRING,
WAERS3 TYPE STRING,
BRUWR4 TYPE STRING,
WAERS4 TYPE STRING,
BRUWR5 TYPE STRING,
WAERS5 TYPE STRING,
BRUWR6 TYPE STRING,
WAERS6 TYPE STRING,
STATR TYPE STRING,
DRG1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLCCOMP_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_RNLCCOMP_STR-DATUM sy-vline 
WA_RNLCCOMP_STR-TARID sy-vline 
WA_RNLCCOMP_STR-TARSP sy-vline 
WA_RNLCCOMP_STR-FPID sy-vline 
WA_RNLCCOMP_STR-FPID2 sy-vline 
WA_RNLCCOMP_STR-SEID sy-vline 
WA_RNLCCOMP_STR-SEID2 sy-vline 
WA_RNLCCOMP_STR-DAUER sy-vline 
WA_RNLCCOMP_STR-AUFDT sy-vline 
WA_RNLCCOMP_STR-ENDDT sy-vline 
WA_RNLCCOMP_STR-ETLDT sy-vline 
WA_RNLCCOMP_STR-CCTEXT1 sy-vline 
WA_RNLCCOMP_STR-CCTEXT2 sy-vline 
WA_RNLCCOMP_STR-CCTEXT3 sy-vline 
WA_RNLCCOMP_STR-CCTEXT4 sy-vline 
WA_RNLCCOMP_STR-CCTEXT5 sy-vline 
WA_RNLCCOMP_STR-CCTEXT6 sy-vline 
WA_RNLCCOMP_STR-BRUWR1 sy-vline 
WA_RNLCCOMP_STR-WAERS1 sy-vline 
WA_RNLCCOMP_STR-BRUWR2 sy-vline 
WA_RNLCCOMP_STR-WAERS2 sy-vline 
WA_RNLCCOMP_STR-BRUWR3 sy-vline 
WA_RNLCCOMP_STR-WAERS3 sy-vline 
WA_RNLCCOMP_STR-BRUWR4 sy-vline 
WA_RNLCCOMP_STR-WAERS4 sy-vline 
WA_RNLCCOMP_STR-BRUWR5 sy-vline 
WA_RNLCCOMP_STR-WAERS5 sy-vline 
WA_RNLCCOMP_STR-BRUWR6 sy-vline 
WA_RNLCCOMP_STR-WAERS6 sy-vline 
WA_RNLCCOMP_STR-STATR sy-vline 
WA_RNLCCOMP_STR-DRG1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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