ABAP Select data from SAP table MCKALKS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCKALKS
*  INTO TABLE @DATA(IT_MCKALKS2).
*--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_MCKALKS INDEX 1 INTO DATA(WA_MCKALKS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCKALKS>-TYPPS = 1.
<MCKALKS>-PSKNZ = 1.
<MCKALKS>-BWTAR = 1.
<MCKALKS>-PREIS = 1.
<MCKALKS>-WERTN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCKALKS-WRTFX, sy-vline,
  WA_MCKALKS-WRTVR, sy-vline,
  WA_MCKALKS-WAERSK, sy-vline,
  WA_MCKALKS-PPREIS, sy-vline,
  WA_MCKALKS-PWERTN, sy-vline,
  WA_MCKALKS-PWRTFX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCKALKS 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_MCKALKS 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_MCKALKS INTO WA_MCKALKS.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MCKALKS_STR, 
TYPPS TYPE STRING,
PSKNZ TYPE STRING,
BWTAR TYPE STRING,
PREIS TYPE STRING,
WERTN TYPE STRING,
WRTFX TYPE STRING,
WRTVR TYPE STRING,
WAERSK TYPE STRING,
PPREIS TYPE STRING,
PWERTN TYPE STRING,
PWRTFX TYPE STRING,
PWRTVR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCKALKS_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_MCKALKS_STR-TYPPS sy-vline 
WA_MCKALKS_STR-PSKNZ sy-vline 
WA_MCKALKS_STR-BWTAR sy-vline 
WA_MCKALKS_STR-PREIS sy-vline 
WA_MCKALKS_STR-WERTN sy-vline 
WA_MCKALKS_STR-WRTFX sy-vline 
WA_MCKALKS_STR-WRTVR sy-vline 
WA_MCKALKS_STR-WAERSK sy-vline 
WA_MCKALKS_STR-PPREIS sy-vline 
WA_MCKALKS_STR-PWERTN sy-vline 
WA_MCKALKS_STR-PWRTFX sy-vline 
WA_MCKALKS_STR-PWRTVR sy-vline      INTO ld_text SEPARATED BY SPACE.

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