ABAP Select data from SAP table MKAUF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MKAUF
*  INTO TABLE @DATA(IT_MKAUF2).
*--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_MKAUF INDEX 1 INTO DATA(WA_MKAUF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MKAUF>-KTEXT = 1.
<MKAUF>-STEXT = 1.
<MKAUF>-LTEXT = 1.
<MKAUF>-LANGU = 1.
<MKAUF>-ARTST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MKAUF-APAGE, sy-vline,
  WA_MKAUF-MPAGE, sy-vline,
  WA_MKAUF-UPD_FLAG, sy-vline,
  WA_MKAUF-O_SALDO, sy-vline,
  WA_MKAUF-K_SALDO, sy-vline,
  WA_MKAUF-DRUCK_ST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MKAUF 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_MKAUF 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_MKAUF INTO WA_MKAUF.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MKAUF-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MKAUF-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field O_SALDO
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MKAUF-O_SALDO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MKAUF-O_SALDO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field K_SALDO
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MKAUF-K_SALDO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MKAUF-K_SALDO.
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_MKAUF_STR, 
KTEXT TYPE STRING,
STEXT TYPE STRING,
LTEXT TYPE STRING,
LANGU TYPE STRING,
ARTST TYPE STRING,
APAGE TYPE STRING,
MPAGE TYPE STRING,
UPD_FLAG TYPE STRING,
O_SALDO TYPE STRING,
K_SALDO TYPE STRING,
DRUCK_ST TYPE STRING,
FLG_OBLIGOX TYPE STRING,
ERLOESE TYPE STRING,
SYSST TYPE STRING,
ANWST TYPE STRING,
AINDX TYPE STRING,
MINDX TYPE STRING,
EINTRAG TYPE STRING,
VARNR TYPE STRING,
BEART TYPE STRING,
MARKE TYPE STRING,
FTEXT TYPE STRING,
BATCH TYPE STRING,
AUFGR TYPE STRING,
FUNCTION TYPE STRING,
TESTLAUF TYPE STRING,
LVTXT TYPE STRING,
BLACT TYPE STRING,
BLANZ TYPE STRING,
ERDAT TYPE STRING,
LISTE TYPE STRING,
WAERS TYPE STRING,
STONR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MKAUF_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_MKAUF_STR-KTEXT sy-vline 
WA_MKAUF_STR-STEXT sy-vline 
WA_MKAUF_STR-LTEXT sy-vline 
WA_MKAUF_STR-LANGU sy-vline 
WA_MKAUF_STR-ARTST sy-vline 
WA_MKAUF_STR-APAGE sy-vline 
WA_MKAUF_STR-MPAGE sy-vline 
WA_MKAUF_STR-UPD_FLAG sy-vline 
WA_MKAUF_STR-O_SALDO sy-vline 
WA_MKAUF_STR-K_SALDO sy-vline 
WA_MKAUF_STR-DRUCK_ST sy-vline 
WA_MKAUF_STR-FLG_OBLIGOX sy-vline 
WA_MKAUF_STR-ERLOESE sy-vline 
WA_MKAUF_STR-SYSST sy-vline 
WA_MKAUF_STR-ANWST sy-vline 
WA_MKAUF_STR-AINDX sy-vline 
WA_MKAUF_STR-MINDX sy-vline 
WA_MKAUF_STR-EINTRAG sy-vline 
WA_MKAUF_STR-VARNR sy-vline 
WA_MKAUF_STR-BEART sy-vline 
WA_MKAUF_STR-MARKE sy-vline 
WA_MKAUF_STR-FTEXT sy-vline 
WA_MKAUF_STR-BATCH sy-vline 
WA_MKAUF_STR-AUFGR sy-vline 
WA_MKAUF_STR-FUNCTION sy-vline 
WA_MKAUF_STR-TESTLAUF sy-vline 
WA_MKAUF_STR-LVTXT sy-vline 
WA_MKAUF_STR-BLACT sy-vline 
WA_MKAUF_STR-BLANZ sy-vline 
WA_MKAUF_STR-ERDAT sy-vline 
WA_MKAUF_STR-LISTE sy-vline 
WA_MKAUF_STR-WAERS sy-vline 
WA_MKAUF_STR-STONR sy-vline      INTO ld_text SEPARATED BY SPACE.

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