ABAP Select data from SAP table KOMLFK_CA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMLFK_CA
*  INTO TABLE @DATA(IT_KOMLFK_CA2).
*--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_KOMLFK_CA INDEX 1 INTO DATA(WA_KOMLFK_CA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMLFK_CA>-WBELN_CA = 1.
<KOMLFK_CA>-WFDAT = 1.
<KOMLFK_CA>-ERDAT = 1.
<KOMLFK_CA>-ERNAM = 1.
<KOMLFK_CA>-BLDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMLFK_CA-XBLNR, sy-vline,
  WA_KOMLFK_CA-ZUONR, sy-vline,
  WA_KOMLFK_CA-KIDNO, sy-vline,
  WA_KOMLFK_CA-RFBSK, sy-vline,
  WA_KOMLFK_CA-WRART, sy-vline,
  WA_KOMLFK_CA-LFART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMLFK_CA 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_KOMLFK_CA 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_KOMLFK_CA INTO WA_KOMLFK_CA.


*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_CA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMLFK_CA-WBELN_CA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMLFK_CA-WBELN_CA.
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_KOMLFK_CA_STR, 
WBELN_CA TYPE STRING,
WFDAT TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
BLDAT TYPE STRING,
XBLNR TYPE STRING,
ZUONR TYPE STRING,
KIDNO TYPE STRING,
RFBSK TYPE STRING,
WRART TYPE STRING,
LFART TYPE STRING,
LFGRU TYPE STRING,
POST_PARTY TYPE STRING,
FKSTO_PART TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMLFK_CA_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_KOMLFK_CA_STR-WBELN_CA sy-vline 
WA_KOMLFK_CA_STR-WFDAT sy-vline 
WA_KOMLFK_CA_STR-ERDAT sy-vline 
WA_KOMLFK_CA_STR-ERNAM sy-vline 
WA_KOMLFK_CA_STR-BLDAT sy-vline 
WA_KOMLFK_CA_STR-XBLNR sy-vline 
WA_KOMLFK_CA_STR-ZUONR sy-vline 
WA_KOMLFK_CA_STR-KIDNO sy-vline 
WA_KOMLFK_CA_STR-RFBSK sy-vline 
WA_KOMLFK_CA_STR-WRART sy-vline 
WA_KOMLFK_CA_STR-LFART sy-vline 
WA_KOMLFK_CA_STR-LFGRU sy-vline 
WA_KOMLFK_CA_STR-POST_PARTY sy-vline 
WA_KOMLFK_CA_STR-FKSTO_PART sy-vline      INTO ld_text SEPARATED BY SPACE.

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