ABAP Select data from SAP table MCAFKO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCAFKO
*  INTO TABLE @DATA(IT_MCAFKO2).
*--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_MCAFKO INDEX 1 INTO DATA(WA_MCAFKO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCAFKO>-AUFNR = 1.
<MCAFKO>-AUFPL = 1.
<MCAFKO>-AUART = 1.
<MCAFKO>-AUTYP = 1.
<MCAFKO>-ERDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCAFKO-AEDAT, sy-vline,
  WA_MCAFKO-OBJNR, sy-vline,
  WA_MCAFKO-BUKRS, sy-vline,
  WA_MCAFKO-WERKS, sy-vline,
  WA_MCAFKO-PLGRP, sy-vline,
  WA_MCAFKO-DISPO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCAFKO 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_MCAFKO 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_MCAFKO INTO WA_MCAFKO.


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field MAUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCAFKO-MAUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCAFKO-MAUFNR.
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_MCAFKO_STR, 
AUFNR TYPE STRING,
AUFPL TYPE STRING,
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,
MDV01 TYPE STRING,
MDV02 TYPE STRING,
KUNUM TYPE STRING,
AMEIN TYPE STRING,
VDATU TYPE STRING,
TERKZ TYPE STRING,
FA_FREI TYPE STRING,
FA_GLFT TYPE STRING,
FA_RUECK TYPE STRING,
FA_TGLI TYPE STRING,
FA_TRUEC TYPE STRING,
GLUZS TYPE STRING,
GSUZS TYPE STRING,
GSUZI TYPE STRING,
GEUZI TYPE STRING,
PLNME TYPE STRING,
LEAD_AUFNR TYPE STRING,
MAUFNR TYPE STRING,
A TYPE STRING,
DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCAFKO_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_MCAFKO_STR-AUFNR sy-vline 
WA_MCAFKO_STR-AUFPL sy-vline 
WA_MCAFKO_STR-AUART sy-vline 
WA_MCAFKO_STR-AUTYP sy-vline 
WA_MCAFKO_STR-ERDAT sy-vline 
WA_MCAFKO_STR-AEDAT sy-vline 
WA_MCAFKO_STR-OBJNR sy-vline 
WA_MCAFKO_STR-BUKRS sy-vline 
WA_MCAFKO_STR-WERKS sy-vline 
WA_MCAFKO_STR-PLGRP sy-vline 
WA_MCAFKO_STR-DISPO sy-vline 
WA_MCAFKO_STR-FEVOR sy-vline 
WA_MCAFKO_STR-GLTRP sy-vline 
WA_MCAFKO_STR-GSTRP sy-vline 
WA_MCAFKO_STR-FTRMS sy-vline 
WA_MCAFKO_STR-GLTRS sy-vline 
WA_MCAFKO_STR-GSTRS sy-vline 
WA_MCAFKO_STR-GSTRI sy-vline 
WA_MCAFKO_STR-GETRI sy-vline 
WA_MCAFKO_STR-GLTRI sy-vline 
WA_MCAFKO_STR-FTRMI sy-vline 
WA_MCAFKO_STR-FTRMP sy-vline 
WA_MCAFKO_STR-GASMG sy-vline 
WA_MCAFKO_STR-GAMNG sy-vline 
WA_MCAFKO_STR-GMEIN sy-vline 
WA_MCAFKO_STR-VERID sy-vline 
WA_MCAFKO_STR-MDV01 sy-vline 
WA_MCAFKO_STR-MDV02 sy-vline 
WA_MCAFKO_STR-KUNUM sy-vline 
WA_MCAFKO_STR-AMEIN sy-vline 
WA_MCAFKO_STR-VDATU sy-vline 
WA_MCAFKO_STR-TERKZ sy-vline 
WA_MCAFKO_STR-FA_FREI sy-vline 
WA_MCAFKO_STR-FA_GLFT sy-vline 
WA_MCAFKO_STR-FA_RUECK sy-vline 
WA_MCAFKO_STR-FA_TGLI sy-vline 
WA_MCAFKO_STR-FA_TRUEC sy-vline 
WA_MCAFKO_STR-GLUZS sy-vline 
WA_MCAFKO_STR-GSUZS sy-vline 
WA_MCAFKO_STR-GSUZI sy-vline 
WA_MCAFKO_STR-GEUZI sy-vline 
WA_MCAFKO_STR-PLNME sy-vline 
WA_MCAFKO_STR-LEAD_AUFNR sy-vline 
WA_MCAFKO_STR-MAUFNR sy-vline 
WA_MCAFKO_STR-A sy-vline 
WA_MCAFKO_STR-DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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