ABAP Select data from SAP table KUAUF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KUAUF
*  INTO TABLE @DATA(IT_KUAUF2).
*--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_KUAUF INDEX 1 INTO DATA(WA_KUAUF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KUAUF>-MATNR = 1.
<KUAUF>-WERKS = 1.
<KUAUF>-LGORT = 1.
<KUAUF>-CHARG = 1.
<KUAUF>-SOBKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KUAUF-VBELN, sy-vline,
  WA_KUAUF-POSNR, sy-vline,
  WA_KUAUF-LFGJA, sy-vline,
  WA_KUAUF-LFMON, sy-vline,
  WA_KUAUF-KASPR, sy-vline,
  WA_KUAUF-KALAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KUAUF 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_KUAUF 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_KUAUF INTO WA_KUAUF.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_KUAUF-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KUAUF-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KUAUF-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KUAUF-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_KUAUF-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KUAUF-LFGJA.
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_KUAUF_STR, 
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
SOBKZ TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
KASPR TYPE STRING,
KALAB TYPE STRING,
KAINS TYPE STRING,
KASPE TYPE STRING,
KAVLA TYPE STRING,
KAVIN TYPE STRING,
KAVSP TYPE STRING,
KAILL TYPE STRING,
KAILQ TYPE STRING,
KAILS TYPE STRING,
KAVLL TYPE STRING,
KAVLQ TYPE STRING,
KAVLS TYPE STRING,
KAFLL TYPE STRING,
KAFLQ TYPE STRING,
KAFLS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KUAUF_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_KUAUF_STR-MATNR sy-vline 
WA_KUAUF_STR-WERKS sy-vline 
WA_KUAUF_STR-LGORT sy-vline 
WA_KUAUF_STR-CHARG sy-vline 
WA_KUAUF_STR-SOBKZ sy-vline 
WA_KUAUF_STR-VBELN sy-vline 
WA_KUAUF_STR-POSNR sy-vline 
WA_KUAUF_STR-LFGJA sy-vline 
WA_KUAUF_STR-LFMON sy-vline 
WA_KUAUF_STR-KASPR sy-vline 
WA_KUAUF_STR-KALAB sy-vline 
WA_KUAUF_STR-KAINS sy-vline 
WA_KUAUF_STR-KASPE sy-vline 
WA_KUAUF_STR-KAVLA sy-vline 
WA_KUAUF_STR-KAVIN sy-vline 
WA_KUAUF_STR-KAVSP sy-vline 
WA_KUAUF_STR-KAILL sy-vline 
WA_KUAUF_STR-KAILQ sy-vline 
WA_KUAUF_STR-KAILS sy-vline 
WA_KUAUF_STR-KAVLL sy-vline 
WA_KUAUF_STR-KAVLQ sy-vline 
WA_KUAUF_STR-KAVLS sy-vline 
WA_KUAUF_STR-KAFLL sy-vline 
WA_KUAUF_STR-KAFLQ sy-vline 
WA_KUAUF_STR-KAFLS sy-vline      INTO ld_text SEPARATED BY SPACE.

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