ABAP Select data from SAP table KOMLFF 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 KOMLFF 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 KOMLFF. 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 KOMLFF 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_KOMLFF TYPE STANDARD TABLE OF KOMLFF,
      WA_KOMLFF TYPE KOMLFF,
      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: <KOMLFF> TYPE KOMLFF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLFF
*  INTO TABLE @DATA(IT_KOMLFF2).
*--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_KOMLFF INDEX 1 INTO DATA(WA_KOMLFF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLFF>-MANDT = 1.
<KOMLFF>-RUUID = 1.
<KOMLFF>-WBELNV = 1.
<KOMLFF>-POSNV = 1.
<KOMLFF>-WBELNN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLFF-POSNN, sy-vline,
  WA_KOMLFF-LFTYPN, sy-vline,
  WA_KOMLFF-LFTYPV, sy-vline,
  WA_KOMLFF-ERDAT, sy-vline,
  WA_KOMLFF-ERZET, sy-vline,
  WA_KOMLFF-ERNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLFF 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_KOMLFF 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_KOMLFF INTO WA_KOMLFF.


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

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

*Conversion exit GJAHR, internal->external for field GJAHRV
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFF-GJAHRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFF-GJAHRV.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFF-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFF-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUGBL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFF-AUGBL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFF-AUGBL.
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_KOMLFF_STR, 
MANDT TYPE STRING,
RUUID TYPE STRING,
WBELNV TYPE STRING,
POSNV TYPE STRING,
WBELNN TYPE STRING,
POSNN TYPE STRING,
LFTYPN TYPE STRING,
LFTYPV TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
ERNAM TYPE STRING,
WRTYP TYPE STRING,
ABARTN TYPE STRING,
WDTYPV TYPE STRING,
WDTYPN TYPE STRING,
GJAHRV TYPE STRING,
WBELNN_LONG TYPE STRING,
_DATAAGING TYPE STRING,
CORR_DOCUMENT TYPE STRING,
KNUMH TYPE STRING,
KOPOS TYPE STRING,
COCO_NUM TYPE STRING,
SETTLEMENT_DATE TYPE STRING,
SETTL_DATE_SEQ_ID TYPE STRING,
UPDKZ TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,
BUZEI TYPE STRING,
AUGDT TYPE STRING,
AUGCP TYPE STRING,
AUGBL TYPE STRING,
WRBTR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLFF_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_KOMLFF_STR-MANDT sy-vline 
WA_KOMLFF_STR-RUUID sy-vline 
WA_KOMLFF_STR-WBELNV sy-vline 
WA_KOMLFF_STR-POSNV sy-vline 
WA_KOMLFF_STR-WBELNN sy-vline 
WA_KOMLFF_STR-POSNN sy-vline 
WA_KOMLFF_STR-LFTYPN sy-vline 
WA_KOMLFF_STR-LFTYPV sy-vline 
WA_KOMLFF_STR-ERDAT sy-vline 
WA_KOMLFF_STR-ERZET sy-vline 
WA_KOMLFF_STR-ERNAM sy-vline 
WA_KOMLFF_STR-WRTYP sy-vline 
WA_KOMLFF_STR-ABARTN sy-vline 
WA_KOMLFF_STR-WDTYPV sy-vline 
WA_KOMLFF_STR-WDTYPN sy-vline 
WA_KOMLFF_STR-GJAHRV sy-vline 
WA_KOMLFF_STR-WBELNN_LONG sy-vline 
WA_KOMLFF_STR-_DATAAGING sy-vline 
WA_KOMLFF_STR-CORR_DOCUMENT sy-vline 
WA_KOMLFF_STR-KNUMH sy-vline 
WA_KOMLFF_STR-KOPOS sy-vline 
WA_KOMLFF_STR-COCO_NUM sy-vline 
WA_KOMLFF_STR-SETTLEMENT_DATE sy-vline 
WA_KOMLFF_STR-SETTL_DATE_SEQ_ID sy-vline 
WA_KOMLFF_STR-UPDKZ sy-vline 
WA_KOMLFF_STR-BELNR sy-vline 
WA_KOMLFF_STR-GJAHR sy-vline 
WA_KOMLFF_STR-BUZEI sy-vline 
WA_KOMLFF_STR-AUGDT sy-vline 
WA_KOMLFF_STR-AUGCP sy-vline 
WA_KOMLFF_STR-AUGBL sy-vline 
WA_KOMLFF_STR-WRBTR sy-vline      INTO ld_text SEPARATED BY SPACE.

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