ABAP Select data from SAP table KOMLFP_FOR_ALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLFP_FOR_ALV
*  INTO TABLE @DATA(IT_KOMLFP_FOR_ALV2).
*--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_KOMLFP_FOR_ALV INDEX 1 INTO DATA(WA_KOMLFP_FOR_ALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLFP_FOR_ALV>-POSNR = 1.
<KOMLFP_FOR_ALV>-MENGE = 1.
<KOMLFP_FOR_ALV>-WFKME = 1.
<KOMLFP_FOR_ALV>-IDNLF = 1.
<KOMLFP_FOR_ALV>-ARKTX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLFP_FOR_ALV-MATNR, sy-vline,
  WA_KOMLFP_FOR_ALV-NETWRD, sy-vline,
  WA_KOMLFP_FOR_ALV-BRTWRD, sy-vline,
  WA_KOMLFP_FOR_ALV-MWSBPD, sy-vline,
  WA_KOMLFP_FOR_ALV-MWSK2, sy-vline,
  WA_KOMLFP_FOR_ALV-WAERL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLFP_FOR_ALV 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_KOMLFP_FOR_ALV 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_KOMLFP_FOR_ALV INTO WA_KOMLFP_FOR_ALV.


*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 CUNIT, internal->external for field WFKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFP_FOR_ALV-WFKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFP_FOR_ALV-WFKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFP_FOR_ALV-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFP_FOR_ALV-MATNR.
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_KOMLFP_FOR_ALV_STR, 
POSNR TYPE STRING,
MENGE TYPE STRING,
WFKME TYPE STRING,
IDNLF TYPE STRING,
ARKTX TYPE STRING,
MATNR TYPE STRING,
NETWRD TYPE STRING,
BRTWRD TYPE STRING,
MWSBPD TYPE STRING,
MWSK2 TYPE STRING,
WAERL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLFP_FOR_ALV_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_KOMLFP_FOR_ALV_STR-POSNR sy-vline 
WA_KOMLFP_FOR_ALV_STR-MENGE sy-vline 
WA_KOMLFP_FOR_ALV_STR-WFKME sy-vline 
WA_KOMLFP_FOR_ALV_STR-IDNLF sy-vline 
WA_KOMLFP_FOR_ALV_STR-ARKTX sy-vline 
WA_KOMLFP_FOR_ALV_STR-MATNR sy-vline 
WA_KOMLFP_FOR_ALV_STR-NETWRD sy-vline 
WA_KOMLFP_FOR_ALV_STR-BRTWRD sy-vline 
WA_KOMLFP_FOR_ALV_STR-MWSBPD sy-vline 
WA_KOMLFP_FOR_ALV_STR-MWSK2 sy-vline 
WA_KOMLFP_FOR_ALV_STR-WAERL sy-vline      INTO ld_text SEPARATED BY SPACE.

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