ABAP Select data from SAP table MCKONA_OLD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCKONA_OLD
*  INTO TABLE @DATA(IT_MCKONA_OLD2).
*--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_MCKONA_OLD INDEX 1 INTO DATA(WA_MCKONA_OLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCKONA_OLD>-MANDT = 1.
<MCKONA_OLD>-KNUMA = 1.
<MCKONA_OLD>-BUKRS = 1.
<MCKONA_OLD>-KNUMH = 1.
<MCKONA_OLD>-KOPOS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCKONA_OLD-LIFNR, sy-vline,
  WA_MCKONA_OLD-KAWRT, sy-vline,
  WA_MCKONA_OLD-WAERS, sy-vline,
  WA_MCKONA_OLD-KKURS, sy-vline,
  WA_MCKONA_OLD-MATKL, sy-vline,
  WA_MCKONA_OLD-BOLIF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCKONA_OLD 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_MCKONA_OLD 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_MCKONA_OLD INTO WA_MCKONA_OLD.


*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_MCKONA_OLD-KNUMA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKONA_OLD-KNUMA.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit EXCRT, internal->external for field KKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MCKONA_OLD-KKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKONA_OLD-KKURS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit EXCRT, internal->external for field AKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MCKONA_OLD-AKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKONA_OLD-AKURS.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

*Conversion exit EXCRT, internal->external for field KURSK
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MCKONA_OLD-KURSK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKONA_OLD-KURSK.
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_MCKONA_OLD_STR, 
MANDT TYPE STRING,
KNUMA TYPE STRING,
BUKRS TYPE STRING,
KNUMH TYPE STRING,
KOPOS TYPE STRING,
LIFNR TYPE STRING,
KAWRT TYPE STRING,
WAERS TYPE STRING,
KKURS TYPE STRING,
MATKL TYPE STRING,
BOLIF TYPE STRING,
DATBI TYPE STRING,
ABSPW TYPE STRING,
HWAER TYPE STRING,
AKURS TYPE STRING,
MWSKZ TYPE STRING,
AGWRT TYPE STRING,
AUWRT TYPE STRING,
RUWRT TYPE STRING,
RRWRT TYPE STRING,
BONBA TYPE STRING,
MENGE TYPE STRING,
BELNR TYPE STRING,
POSNR TYPE STRING,
BUDAT TYPE STRING,
WERKS TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
GEWEI TYPE STRING,
VOLEH TYPE STRING,
BRGEW TYPE STRING,
NTGEW TYPE STRING,
VOLUM TYPE STRING,
ANZPU TYPE STRING,
PUNEI TYPE STRING,
MEINS TYPE STRING,
BOBAS TYPE STRING,
STAFO TYPE STRING,
KURSK TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
BZIRK TYPE STRING,
BTRKZ TYPE STRING,
EKSGB TYPE STRING,
ABTNR TYPE STRING,
WGRU2 TYPE STRING,
WGRU1 TYPE STRING,
LAND1 TYPE STRING,
WRKGR2 TYPE STRING,
WRKGR1 TYPE STRING,
DUMMYUSR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCKONA_OLD_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_MCKONA_OLD_STR-MANDT sy-vline 
WA_MCKONA_OLD_STR-KNUMA sy-vline 
WA_MCKONA_OLD_STR-BUKRS sy-vline 
WA_MCKONA_OLD_STR-KNUMH sy-vline 
WA_MCKONA_OLD_STR-KOPOS sy-vline 
WA_MCKONA_OLD_STR-LIFNR sy-vline 
WA_MCKONA_OLD_STR-KAWRT sy-vline 
WA_MCKONA_OLD_STR-WAERS sy-vline 
WA_MCKONA_OLD_STR-KKURS sy-vline 
WA_MCKONA_OLD_STR-MATKL sy-vline 
WA_MCKONA_OLD_STR-BOLIF sy-vline 
WA_MCKONA_OLD_STR-DATBI sy-vline 
WA_MCKONA_OLD_STR-ABSPW sy-vline 
WA_MCKONA_OLD_STR-HWAER sy-vline 
WA_MCKONA_OLD_STR-AKURS sy-vline 
WA_MCKONA_OLD_STR-MWSKZ sy-vline 
WA_MCKONA_OLD_STR-AGWRT sy-vline 
WA_MCKONA_OLD_STR-AUWRT sy-vline 
WA_MCKONA_OLD_STR-RUWRT sy-vline 
WA_MCKONA_OLD_STR-RRWRT sy-vline 
WA_MCKONA_OLD_STR-BONBA sy-vline 
WA_MCKONA_OLD_STR-MENGE sy-vline 
WA_MCKONA_OLD_STR-BELNR sy-vline 
WA_MCKONA_OLD_STR-POSNR sy-vline 
WA_MCKONA_OLD_STR-BUDAT sy-vline 
WA_MCKONA_OLD_STR-WERKS sy-vline 
WA_MCKONA_OLD_STR-EKORG sy-vline 
WA_MCKONA_OLD_STR-EKGRP sy-vline 
WA_MCKONA_OLD_STR-GEWEI sy-vline 
WA_MCKONA_OLD_STR-VOLEH sy-vline 
WA_MCKONA_OLD_STR-BRGEW sy-vline 
WA_MCKONA_OLD_STR-NTGEW sy-vline 
WA_MCKONA_OLD_STR-VOLUM sy-vline 
WA_MCKONA_OLD_STR-ANZPU sy-vline 
WA_MCKONA_OLD_STR-PUNEI sy-vline 
WA_MCKONA_OLD_STR-MEINS sy-vline 
WA_MCKONA_OLD_STR-BOBAS sy-vline 
WA_MCKONA_OLD_STR-STAFO sy-vline 
WA_MCKONA_OLD_STR-KURSK sy-vline 
WA_MCKONA_OLD_STR-VKORG sy-vline 
WA_MCKONA_OLD_STR-VTWEG sy-vline 
WA_MCKONA_OLD_STR-BZIRK sy-vline 
WA_MCKONA_OLD_STR-BTRKZ sy-vline 
WA_MCKONA_OLD_STR-EKSGB sy-vline 
WA_MCKONA_OLD_STR-ABTNR sy-vline 
WA_MCKONA_OLD_STR-WGRU2 sy-vline 
WA_MCKONA_OLD_STR-WGRU1 sy-vline 
WA_MCKONA_OLD_STR-LAND1 sy-vline 
WA_MCKONA_OLD_STR-WRKGR2 sy-vline 
WA_MCKONA_OLD_STR-WRKGR1 sy-vline 
WA_MCKONA_OLD_STR-DUMMYUSR sy-vline      INTO ld_text SEPARATED BY SPACE.

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