ABAP Select data from SAP table MCKONAIB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCKONAIB
*  INTO TABLE @DATA(IT_MCKONAIB2).
*--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_MCKONAIB INDEX 1 INTO DATA(WA_MCKONAIB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCKONAIB>-SUPKZ = 1.
<MCKONAIB>-BLTYP = 1.
<MCKONAIB>-KVEWE = 1.
<MCKONAIB>-KAPPL = 1.
<MCKONAIB>-KOTABNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCKONAIB-VARKEY, sy-vline,
  WA_MCKONAIB-DATUM, sy-vline,
  WA_MCKONAIB-DATUM2, sy-vline,
  WA_MCKONAIB-BELNR, sy-vline,
  WA_MCKONAIB-POSNR, sy-vline,
  WA_MCKONAIB-KHERK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCKONAIB 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_MCKONAIB 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_MCKONAIB INTO WA_MCKONAIB.


*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 KOTAB, internal->external for field KOTABNR
CALL FUNCTION 'CONVERSION_EXIT_KOTAB_OUTPUT'
  EXPORTING
    input =                      WA_MCKONAIB-KOTABNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKONAIB-KOTABNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCKONAIB-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKONAIB-BELNR.
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_MCKONAIB_STR, 
SUPKZ TYPE STRING,
BLTYP TYPE STRING,
KVEWE TYPE STRING,
KAPPL TYPE STRING,
KOTABNR TYPE STRING,
VARKEY TYPE STRING,
DATUM TYPE STRING,
DATUM2 TYPE STRING,
BELNR TYPE STRING,
POSNR TYPE STRING,
KHERK TYPE STRING,
BUKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCKONAIB_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_MCKONAIB_STR-SUPKZ sy-vline 
WA_MCKONAIB_STR-BLTYP sy-vline 
WA_MCKONAIB_STR-KVEWE sy-vline 
WA_MCKONAIB_STR-KAPPL sy-vline 
WA_MCKONAIB_STR-KOTABNR sy-vline 
WA_MCKONAIB_STR-VARKEY sy-vline 
WA_MCKONAIB_STR-DATUM sy-vline 
WA_MCKONAIB_STR-DATUM2 sy-vline 
WA_MCKONAIB_STR-BELNR sy-vline 
WA_MCKONAIB_STR-POSNR sy-vline 
WA_MCKONAIB_STR-KHERK sy-vline 
WA_MCKONAIB_STR-BUKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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