ABAP Select data from SAP table MCKALKV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCKALKV
*  INTO TABLE @DATA(IT_MCKALKV2).
*--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_MCKALKV INDEX 1 INTO DATA(WA_MCKALKV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCKALKV>-MANDT = 1.
<MCKALKV>-SSOUR = 1.
<MCKALKV>-VRSIO = 1.
<MCKALKV>-AUFNR = 1.
<MCKALKV>-POSNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCKALKV-TYPPS, sy-vline,
  WA_MCKALKV-KSTAR, sy-vline,
  WA_MCKALKV-KOSTL, sy-vline,
  WA_MCKALKV-LSTAR, sy-vline,
  WA_MCKALKV-HRKFT, sy-vline,
  WA_MCKALKV-ELEMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCKALKV 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_MCKALKV 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_MCKALKV INTO WA_MCKALKV.


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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCKALKV-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCKALKV-MATNR.
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_MCKALKV_STR, 
MANDT TYPE STRING,
SSOUR TYPE STRING,
VRSIO TYPE STRING,
AUFNR TYPE STRING,
POSNR TYPE STRING,
TYPPS TYPE STRING,
KSTAR TYPE STRING,
KOSTL TYPE STRING,
LSTAR TYPE STRING,
HRKFT TYPE STRING,
ELEMT TYPE STRING,
PSKNZ TYPE STRING,
BWTAR TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
ARBID 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,
A TYPE STRING,
DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCKALKV_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_MCKALKV_STR-MANDT sy-vline 
WA_MCKALKV_STR-SSOUR sy-vline 
WA_MCKALKV_STR-VRSIO sy-vline 
WA_MCKALKV_STR-AUFNR sy-vline 
WA_MCKALKV_STR-POSNR sy-vline 
WA_MCKALKV_STR-TYPPS sy-vline 
WA_MCKALKV_STR-KSTAR sy-vline 
WA_MCKALKV_STR-KOSTL sy-vline 
WA_MCKALKV_STR-LSTAR sy-vline 
WA_MCKALKV_STR-HRKFT sy-vline 
WA_MCKALKV_STR-ELEMT sy-vline 
WA_MCKALKV_STR-PSKNZ sy-vline 
WA_MCKALKV_STR-BWTAR sy-vline 
WA_MCKALKV_STR-WERKS sy-vline 
WA_MCKALKV_STR-MATNR sy-vline 
WA_MCKALKV_STR-ARBID sy-vline 
WA_MCKALKV_STR-GPREIS sy-vline 
WA_MCKALKV_STR-FPREIS sy-vline 
WA_MCKALKV_STR-VPREIS sy-vline 
WA_MCKALKV_STR-PEINH sy-vline 
WA_MCKALKV_STR-WERTN sy-vline 
WA_MCKALKV_STR-WRTFX sy-vline 
WA_MCKALKV_STR-WRTVR sy-vline 
WA_MCKALKV_STR-HWAER sy-vline 
WA_MCKALKV_STR-OPREIS sy-vline 
WA_MCKALKV_STR-TPREIS sy-vline 
WA_MCKALKV_STR-WRTFW_KPF sy-vline 
WA_MCKALKV_STR-FWAER_KPF sy-vline 
WA_MCKALKV_STR-WRTFW_POS sy-vline 
WA_MCKALKV_STR-FWAER sy-vline 
WA_MCKALKV_STR-PGPREIS sy-vline 
WA_MCKALKV_STR-PFPREIS sy-vline 
WA_MCKALKV_STR-PVPREIS sy-vline 
WA_MCKALKV_STR-PPEINH sy-vline 
WA_MCKALKV_STR-PWERTN sy-vline 
WA_MCKALKV_STR-PWRTFX sy-vline 
WA_MCKALKV_STR-PWRTVR sy-vline 
WA_MCKALKV_STR-POPREIS sy-vline 
WA_MCKALKV_STR-PTPREIS sy-vline 
WA_MCKALKV_STR-PWRTFW_KPF sy-vline 
WA_MCKALKV_STR-PWRTFW_POS sy-vline 
WA_MCKALKV_STR-A sy-vline 
WA_MCKALKV_STR-DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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