ABAP Select data from SAP table MCKONACHK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCKONACHK
*  INTO TABLE @DATA(IT_MCKONACHK2).
*--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_MCKONACHK INDEX 1 INTO DATA(WA_MCKONACHK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCKONACHK>-KNUMA = 1.
<MCKONACHK>-KNUMH = 1.
<MCKONACHK>-KOPOS = 1.
<MCKONACHK>-LIFNR = 1.
<MCKONACHK>-MWSKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCKONACHK-WERKS, sy-vline,
  WA_MCKONACHK-BOLIF, sy-vline,
  WA_MCKONACHK-MATKL, sy-vline,
  WA_MCKONACHK-EKORG, sy-vline,
  WA_MCKONACHK-EKGRP, sy-vline,
  WA_MCKONACHK-DATBI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCKONACHK 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_MCKONACHK 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_MCKONACHK INTO WA_MCKONACHK.


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

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

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

*Conversion exit ALPHA, internal->external for field KUNRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCKONACHK-KUNRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKONACHK-KUNRE.
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_MCKONACHK_STR, 
KNUMA TYPE STRING,
KNUMH TYPE STRING,
KOPOS TYPE STRING,
LIFNR TYPE STRING,
MWSKZ TYPE STRING,
WERKS TYPE STRING,
BOLIF TYPE STRING,
MATKL TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
DATBI TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KUNRE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCKONACHK_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_MCKONACHK_STR-KNUMA sy-vline 
WA_MCKONACHK_STR-KNUMH sy-vline 
WA_MCKONACHK_STR-KOPOS sy-vline 
WA_MCKONACHK_STR-LIFNR sy-vline 
WA_MCKONACHK_STR-MWSKZ sy-vline 
WA_MCKONACHK_STR-WERKS sy-vline 
WA_MCKONACHK_STR-BOLIF sy-vline 
WA_MCKONACHK_STR-MATKL sy-vline 
WA_MCKONACHK_STR-EKORG sy-vline 
WA_MCKONACHK_STR-EKGRP sy-vline 
WA_MCKONACHK_STR-DATBI sy-vline 
WA_MCKONACHK_STR-VKORG sy-vline 
WA_MCKONACHK_STR-VTWEG sy-vline 
WA_MCKONACHK_STR-SPART sy-vline 
WA_MCKONACHK_STR-KUNRE sy-vline      INTO ld_text SEPARATED BY SPACE.

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