ABAP Select data from SAP table MCKALKW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCKALKW
*  INTO TABLE @DATA(IT_MCKALKW2).
*--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_MCKALKW INDEX 1 INTO DATA(WA_MCKALKW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCKALKW>-MANDT = 1.
<MCKALKW>-VRSIO = 1.
<MCKALKW>-AUFNR = 1.
<MCKALKW>-KSTAR = 1.
<MCKALKW>-KOSTL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCKALKW-LSTAR, sy-vline,
  WA_MCKALKW-WERKS, sy-vline,
  WA_MCKALKW-MATNR, sy-vline,
  WA_MCKALKW-ARBID, sy-vline,
  WA_MCKALKW-TYPPS, sy-vline,
  WA_MCKALKW-HRKFT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCKALKW 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_MCKALKW 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_MCKALKW INTO WA_MCKALKW.


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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCKALKW-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKALKW-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEEHT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCKALKW-MEEHT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKALKW-MEEHT.
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_MCKALKW_STR, 
MANDT TYPE STRING,
VRSIO TYPE STRING,
AUFNR TYPE STRING,
KSTAR TYPE STRING,
KOSTL TYPE STRING,
LSTAR TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
ARBID TYPE STRING,
TYPPS TYPE STRING,
HRKFT TYPE STRING,
ELEMT TYPE STRING,
PSKNZ TYPE STRING,
BWTAR TYPE STRING,
GPREIS TYPE STRING,
FPREIS TYPE STRING,
VPREIS TYPE STRING,
PEINH TYPE STRING,
WERTN TYPE STRING,
WRTFX TYPE STRING,
WRTVR TYPE STRING,
HWAER TYPE STRING,
OPREIS TYPE STRING,
TPREIS TYPE STRING,
WRTFW_KPF TYPE STRING,
FWAER_KPF TYPE STRING,
WRTFW_POS TYPE STRING,
FWAER TYPE STRING,
PGPREIS TYPE STRING,
PFPREIS TYPE STRING,
PVPREIS TYPE STRING,
PPEINH TYPE STRING,
PWERTN TYPE STRING,
PWRTFX TYPE STRING,
PWRTVR TYPE STRING,
POPREIS TYPE STRING,
PTPREIS TYPE STRING,
PWRTFW_KPF TYPE STRING,
PWRTFW_POS TYPE STRING,
MENGE TYPE STRING,
MEEHT TYPE STRING,
PMENGE TYPE STRING,
WERKSARBPL TYPE STRING,
ARBPL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCKALKW_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_MCKALKW_STR-MANDT sy-vline 
WA_MCKALKW_STR-VRSIO sy-vline 
WA_MCKALKW_STR-AUFNR sy-vline 
WA_MCKALKW_STR-KSTAR sy-vline 
WA_MCKALKW_STR-KOSTL sy-vline 
WA_MCKALKW_STR-LSTAR sy-vline 
WA_MCKALKW_STR-WERKS sy-vline 
WA_MCKALKW_STR-MATNR sy-vline 
WA_MCKALKW_STR-ARBID sy-vline 
WA_MCKALKW_STR-TYPPS sy-vline 
WA_MCKALKW_STR-HRKFT sy-vline 
WA_MCKALKW_STR-ELEMT sy-vline 
WA_MCKALKW_STR-PSKNZ sy-vline 
WA_MCKALKW_STR-BWTAR sy-vline 
WA_MCKALKW_STR-GPREIS sy-vline 
WA_MCKALKW_STR-FPREIS sy-vline 
WA_MCKALKW_STR-VPREIS sy-vline 
WA_MCKALKW_STR-PEINH sy-vline 
WA_MCKALKW_STR-WERTN sy-vline 
WA_MCKALKW_STR-WRTFX sy-vline 
WA_MCKALKW_STR-WRTVR sy-vline 
WA_MCKALKW_STR-HWAER sy-vline 
WA_MCKALKW_STR-OPREIS sy-vline 
WA_MCKALKW_STR-TPREIS sy-vline 
WA_MCKALKW_STR-WRTFW_KPF sy-vline 
WA_MCKALKW_STR-FWAER_KPF sy-vline 
WA_MCKALKW_STR-WRTFW_POS sy-vline 
WA_MCKALKW_STR-FWAER sy-vline 
WA_MCKALKW_STR-PGPREIS sy-vline 
WA_MCKALKW_STR-PFPREIS sy-vline 
WA_MCKALKW_STR-PVPREIS sy-vline 
WA_MCKALKW_STR-PPEINH sy-vline 
WA_MCKALKW_STR-PWERTN sy-vline 
WA_MCKALKW_STR-PWRTFX sy-vline 
WA_MCKALKW_STR-PWRTVR sy-vline 
WA_MCKALKW_STR-POPREIS sy-vline 
WA_MCKALKW_STR-PTPREIS sy-vline 
WA_MCKALKW_STR-PWRTFW_KPF sy-vline 
WA_MCKALKW_STR-PWRTFW_POS sy-vline 
WA_MCKALKW_STR-MENGE sy-vline 
WA_MCKALKW_STR-MEEHT sy-vline 
WA_MCKALKW_STR-PMENGE sy-vline 
WA_MCKALKW_STR-WERKSARBPL sy-vline 
WA_MCKALKW_STR-ARBPL sy-vline      INTO ld_text SEPARATED BY SPACE.

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