ABAP Select data from SAP table KNKA_AEDAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNKA_AEDAT
*  INTO TABLE @DATA(IT_KNKA_AEDAT2).
*--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_KNKA_AEDAT INDEX 1 INTO DATA(WA_KNKA_AEDAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNKA_AEDAT>-MANDT = 1.
<KNKA_AEDAT>-KUNNR = 1.
<KNKA_AEDAT>-TABNAME = 1.
<KNKA_AEDAT>-KKBER = 1.
<KNKA_AEDAT>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNKA_AEDAT-KLIMG, sy-vline,
  WA_KNKA_AEDAT-KLIME, sy-vline,
  WA_KNKA_AEDAT-WAERS, sy-vline,
  WA_KNKA_AEDAT-DLAUS, sy-vline,
  WA_KNKA_AEDAT-AEDAT, sy-vline,
  WA_KNKA_AEDAT-AETIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNKA_AEDAT 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_KNKA_AEDAT 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_KNKA_AEDAT INTO WA_KNKA_AEDAT.


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

*Conversion exit AU152, internal->external for field KLIMG
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_KNKA_AEDAT-KLIMG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKA_AEDAT-KLIMG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field KLIME
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_KNKA_AEDAT-KLIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KNKA_AEDAT-KLIME.
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_KNKA_AEDAT_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
TABNAME TYPE STRING,
KKBER TYPE STRING,
BUKRS TYPE STRING,
KLIMG TYPE STRING,
KLIME TYPE STRING,
WAERS TYPE STRING,
DLAUS TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNKA_AEDAT_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_KNKA_AEDAT_STR-MANDT sy-vline 
WA_KNKA_AEDAT_STR-KUNNR sy-vline 
WA_KNKA_AEDAT_STR-TABNAME sy-vline 
WA_KNKA_AEDAT_STR-KKBER sy-vline 
WA_KNKA_AEDAT_STR-BUKRS sy-vline 
WA_KNKA_AEDAT_STR-KLIMG sy-vline 
WA_KNKA_AEDAT_STR-KLIME sy-vline 
WA_KNKA_AEDAT_STR-WAERS sy-vline 
WA_KNKA_AEDAT_STR-DLAUS sy-vline 
WA_KNKA_AEDAT_STR-AEDAT sy-vline 
WA_KNKA_AEDAT_STR-AETIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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