ABAP Select data from SAP table KOMLRP_LI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLRP_LI
*  INTO TABLE @DATA(IT_KOMLRP_LI2).
*--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_KOMLRP_LI INDEX 1 INTO DATA(WA_KOMLRP_LI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLRP_LI>-WBELN = 1.
<KOMLRP_LI>-POSNR = 1.
<KOMLRP_LI>-NETWR = 1.
<KOMLRP_LI>-MWSBP = 1.
<KOMLRP_LI>-BRTWR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLRP_LI-WAERL, sy-vline,
  WA_KOMLRP_LI-MWSKZ, sy-vline,
  WA_KOMLRP_LI-MWSK2, sy-vline,
  WA_KOMLRP_LI-PRSDT, sy-vline,
  WA_KOMLRP_LI-MATKL, sy-vline,
  WA_KOMLRP_LI-IDNLF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLRP_LI 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_KOMLRP_LI 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_KOMLRP_LI INTO WA_KOMLRP_LI.


*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 WBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLRP_LI-WBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLRP_LI-WBELN.
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_KOMLRP_LI_STR, 
WBELN TYPE STRING,
POSNR TYPE STRING,
NETWR TYPE STRING,
MWSBP TYPE STRING,
BRTWR TYPE STRING,
WAERL TYPE STRING,
MWSKZ TYPE STRING,
MWSK2 TYPE STRING,
PRSDT TYPE STRING,
MATKL TYPE STRING,
IDNLF TYPE STRING,
LTSNR TYPE STRING,
EKKOL TYPE STRING,
WERKS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLRP_LI_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_KOMLRP_LI_STR-WBELN sy-vline 
WA_KOMLRP_LI_STR-POSNR sy-vline 
WA_KOMLRP_LI_STR-NETWR sy-vline 
WA_KOMLRP_LI_STR-MWSBP sy-vline 
WA_KOMLRP_LI_STR-BRTWR sy-vline 
WA_KOMLRP_LI_STR-WAERL sy-vline 
WA_KOMLRP_LI_STR-MWSKZ sy-vline 
WA_KOMLRP_LI_STR-MWSK2 sy-vline 
WA_KOMLRP_LI_STR-PRSDT sy-vline 
WA_KOMLRP_LI_STR-MATKL sy-vline 
WA_KOMLRP_LI_STR-IDNLF sy-vline 
WA_KOMLRP_LI_STR-LTSNR sy-vline 
WA_KOMLRP_LI_STR-EKKOL sy-vline 
WA_KOMLRP_LI_STR-WERKS sy-vline      INTO ld_text SEPARATED BY SPACE.

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