ABAP Select data from SAP table E3KNKKM into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP E3KNKKM 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 E3KNKKM. 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 E3KNKKM 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_E3KNKKM TYPE STANDARD TABLE OF E3KNKKM,
      WA_E3KNKKM TYPE E3KNKKM,
      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: <E3KNKKM> TYPE E3KNKKM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E3KNKKM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E3KNKKM
  INTO TABLE IT_E3KNKKM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E3KNKKM
*  INTO TABLE @DATA(IT_E3KNKKM2).
*--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_E3KNKKM INDEX 1 INTO DATA(WA_E3KNKKM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E3KNKKM ASSIGNING <E3KNKKM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E3KNKKM>-MSGFN = 1.
<E3KNKKM>-KKBER = 1.
<E3KNKKM>-KLIMK = 1.
<E3KNKKM>-KNKLI = 1.
<E3KNKKM>-CTLPC = 1.

ENDLOOP.

LOOP AT IT_E3KNKKM INTO WA_E3KNKKM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E3KNKKM-DTREV, sy-vline,
  WA_E3KNKKM-CRBLB, sy-vline,
  WA_E3KNKKM-SBGRP, sy-vline,
  WA_E3KNKKM-NXTRV, sy-vline,
  WA_E3KNKKM-KRAUS, sy-vline,
  WA_E3KNKKM-PAYDB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E3KNKKM 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_E3KNKKM 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_E3KNKKM INTO WA_E3KNKKM.


*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 KNKLI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_E3KNKKM-KNKLI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E3KNKKM-KNKLI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field DBEKR
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_E3KNKKM-DBEKR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E3KNKKM-DBEKR.
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_E3KNKKM_STR, 
MSGFN TYPE STRING,
KKBER TYPE STRING,
KLIMK TYPE STRING,
KNKLI TYPE STRING,
CTLPC TYPE STRING,
DTREV TYPE STRING,
CRBLB TYPE STRING,
SBGRP TYPE STRING,
NXTRV TYPE STRING,
KRAUS TYPE STRING,
PAYDB TYPE STRING,
DBRAT TYPE STRING,
REVDB TYPE STRING,
GRUPP TYPE STRING,
SBDAT TYPE STRING,
KDGRP TYPE STRING,
DBPAY TYPE STRING,
DBRTG TYPE STRING,
DBEKR TYPE STRING,
DBWAE TYPE STRING,
DBMON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E3KNKKM_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_E3KNKKM_STR-MSGFN sy-vline 
WA_E3KNKKM_STR-KKBER sy-vline 
WA_E3KNKKM_STR-KLIMK sy-vline 
WA_E3KNKKM_STR-KNKLI sy-vline 
WA_E3KNKKM_STR-CTLPC sy-vline 
WA_E3KNKKM_STR-DTREV sy-vline 
WA_E3KNKKM_STR-CRBLB sy-vline 
WA_E3KNKKM_STR-SBGRP sy-vline 
WA_E3KNKKM_STR-NXTRV sy-vline 
WA_E3KNKKM_STR-KRAUS sy-vline 
WA_E3KNKKM_STR-PAYDB sy-vline 
WA_E3KNKKM_STR-DBRAT sy-vline 
WA_E3KNKKM_STR-REVDB sy-vline 
WA_E3KNKKM_STR-GRUPP sy-vline 
WA_E3KNKKM_STR-SBDAT sy-vline 
WA_E3KNKKM_STR-KDGRP sy-vline 
WA_E3KNKKM_STR-DBPAY sy-vline 
WA_E3KNKKM_STR-DBRTG sy-vline 
WA_E3KNKKM_STR-DBEKR sy-vline 
WA_E3KNKKM_STR-DBWAE sy-vline 
WA_E3KNKKM_STR-DBMON sy-vline      INTO ld_text SEPARATED BY SPACE.

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