ABAP Select data from SAP table MCAFKOS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCAFKOS
*  INTO TABLE @DATA(IT_MCAFKOS2).
*--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_MCAFKOS INDEX 1 INTO DATA(WA_MCAFKOS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCAFKOS>-AUART = 1.
<MCAFKOS>-AUTYP = 1.
<MCAFKOS>-ERDAT = 1.
<MCAFKOS>-AEDAT = 1.
<MCAFKOS>-OBJNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCAFKOS-BUKRS, sy-vline,
  WA_MCAFKOS-WERKS, sy-vline,
  WA_MCAFKOS-PLGRP, sy-vline,
  WA_MCAFKOS-DISPO, sy-vline,
  WA_MCAFKOS-FEVOR, sy-vline,
  WA_MCAFKOS-GLTRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCAFKOS 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_MCAFKOS 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_MCAFKOS INTO WA_MCAFKOS.


*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 CUNIT, internal->external for field GMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCAFKOS-GMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCAFKOS-GMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCAFKOS-KUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCAFKOS-KUNUM.
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_MCAFKOS_STR, 
AUART TYPE STRING,
AUTYP TYPE STRING,
ERDAT TYPE STRING,
AEDAT TYPE STRING,
OBJNR TYPE STRING,
BUKRS TYPE STRING,
WERKS TYPE STRING,
PLGRP TYPE STRING,
DISPO TYPE STRING,
FEVOR TYPE STRING,
GLTRP TYPE STRING,
GSTRP TYPE STRING,
FTRMS TYPE STRING,
GLTRS TYPE STRING,
GSTRS TYPE STRING,
GSTRI TYPE STRING,
GETRI TYPE STRING,
GLTRI TYPE STRING,
FTRMI TYPE STRING,
FTRMP TYPE STRING,
GASMG TYPE STRING,
GAMNG TYPE STRING,
GMEIN TYPE STRING,
VERID TYPE STRING,
KUNUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCAFKOS_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_MCAFKOS_STR-AUART sy-vline 
WA_MCAFKOS_STR-AUTYP sy-vline 
WA_MCAFKOS_STR-ERDAT sy-vline 
WA_MCAFKOS_STR-AEDAT sy-vline 
WA_MCAFKOS_STR-OBJNR sy-vline 
WA_MCAFKOS_STR-BUKRS sy-vline 
WA_MCAFKOS_STR-WERKS sy-vline 
WA_MCAFKOS_STR-PLGRP sy-vline 
WA_MCAFKOS_STR-DISPO sy-vline 
WA_MCAFKOS_STR-FEVOR sy-vline 
WA_MCAFKOS_STR-GLTRP sy-vline 
WA_MCAFKOS_STR-GSTRP sy-vline 
WA_MCAFKOS_STR-FTRMS sy-vline 
WA_MCAFKOS_STR-GLTRS sy-vline 
WA_MCAFKOS_STR-GSTRS sy-vline 
WA_MCAFKOS_STR-GSTRI sy-vline 
WA_MCAFKOS_STR-GETRI sy-vline 
WA_MCAFKOS_STR-GLTRI sy-vline 
WA_MCAFKOS_STR-FTRMI sy-vline 
WA_MCAFKOS_STR-FTRMP sy-vline 
WA_MCAFKOS_STR-GASMG sy-vline 
WA_MCAFKOS_STR-GAMNG sy-vline 
WA_MCAFKOS_STR-GMEIN sy-vline 
WA_MCAFKOS_STR-VERID sy-vline 
WA_MCAFKOS_STR-KUNUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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