ABAP Select data from SAP table MCBWHAFKO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCBWHAFKO
*  INTO TABLE @DATA(IT_MCBWHAFKO2).
*--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_MCBWHAFKO INDEX 1 INTO DATA(WA_MCBWHAFKO2).


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

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

ENDLOOP.

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

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


*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_MCBWHAFKO-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCBWHAFKO-AUFNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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