ABAP Select data from SAP table KOMPLKC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMPLKC
*  INTO TABLE @DATA(IT_KOMPLKC2).
*--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_KOMPLKC INDEX 1 INTO DATA(WA_KOMPLKC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMPLKC>-WBELN = 1.
<KOMPLKC>-WFDAT = 1.
<KOMPLKC>-ZTERMD = 1.
<KOMPLKC>-ZLSCHD = 1.
<KOMPLKC>-BLDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMPLKC-WFDAT_RL, sy-vline,
  WA_KOMPLKC-WKURS_DAT, sy-vline,
  WA_KOMPLKC-WKURS, sy-vline,
  WA_KOMPLKC-ZUONR, sy-vline,
  WA_KOMPLKC-KIDNO, sy-vline,
  WA_KOMPLKC-XBLNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMPLKC 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_KOMPLKC 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_KOMPLKC INTO WA_KOMPLKC.


*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_KOMPLKC-WBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPLKC-WBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field WKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_KOMPLKC-WKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMPLKC-WKURS.
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_KOMPLKC_STR, 
WBELN TYPE STRING,
WFDAT TYPE STRING,
ZTERMD TYPE STRING,
ZLSCHD TYPE STRING,
BLDAT TYPE STRING,
WFDAT_RL TYPE STRING,
WKURS_DAT TYPE STRING,
WKURS TYPE STRING,
ZUONR TYPE STRING,
KIDNO TYPE STRING,
XBLNR TYPE STRING,
ZBD1TD TYPE STRING,
ZBD1PD TYPE STRING,
ZBD2TD TYPE STRING,
ZBD2PD TYPE STRING,
ZBD3TD TYPE STRING,
VALDTD TYPE STRING,
VALTGD TYPE STRING,
TESTRUN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMPLKC_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_KOMPLKC_STR-WBELN sy-vline 
WA_KOMPLKC_STR-WFDAT sy-vline 
WA_KOMPLKC_STR-ZTERMD sy-vline 
WA_KOMPLKC_STR-ZLSCHD sy-vline 
WA_KOMPLKC_STR-BLDAT sy-vline 
WA_KOMPLKC_STR-WFDAT_RL sy-vline 
WA_KOMPLKC_STR-WKURS_DAT sy-vline 
WA_KOMPLKC_STR-WKURS sy-vline 
WA_KOMPLKC_STR-ZUONR sy-vline 
WA_KOMPLKC_STR-KIDNO sy-vline 
WA_KOMPLKC_STR-XBLNR sy-vline 
WA_KOMPLKC_STR-ZBD1TD sy-vline 
WA_KOMPLKC_STR-ZBD1PD sy-vline 
WA_KOMPLKC_STR-ZBD2TD sy-vline 
WA_KOMPLKC_STR-ZBD2PD sy-vline 
WA_KOMPLKC_STR-ZBD3TD sy-vline 
WA_KOMPLKC_STR-VALDTD sy-vline 
WA_KOMPLKC_STR-VALTGD sy-vline 
WA_KOMPLKC_STR-TESTRUN sy-vline      INTO ld_text SEPARATED BY SPACE.

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