ABAP Select data from SAP table MKOL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MKOL
*  INTO TABLE @DATA(IT_MKOL2).
*--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_MKOL INDEX 1 INTO DATA(WA_MKOL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MKOL>-MANDT = 1.
<MKOL>-MATNR = 1.
<MKOL>-WERKS = 1.
<MKOL>-LGORT = 1.
<MKOL>-CHARG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MKOL-SOBKZ, sy-vline,
  WA_MKOL-LIFNR, sy-vline,
  WA_MKOL-LVORM, sy-vline,
  WA_MKOL-ERSDA, sy-vline,
  WA_MKOL-ERNAM, sy-vline,
  WA_MKOL-AENAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MKOL 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_MKOL 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_MKOL INTO WA_MKOL.


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

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

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MKOL-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MKOL-LFGJA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field KOJIN
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MKOL-KOJIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MKOL-KOJIN.
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_MKOL_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
SOBKZ TYPE STRING,
LIFNR TYPE STRING,
LVORM TYPE STRING,
ERSDA TYPE STRING,
ERNAM TYPE STRING,
AENAM TYPE STRING,
LAEDA TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
SPERS TYPE STRING,
SLABS TYPE STRING,
SINSM TYPE STRING,
SEINM TYPE STRING,
SSPEM TYPE STRING,
SVMLA TYPE STRING,
SVMIN TYPE STRING,
SVMEI TYPE STRING,
SVMSP TYPE STRING,
KZISL TYPE STRING,
KZISQ TYPE STRING,
KZISE TYPE STRING,
KZISS TYPE STRING,
KZVSL TYPE STRING,
KZVSQ TYPE STRING,
KZVSE TYPE STRING,
KZVSS TYPE STRING,
MMENG TYPE STRING,
AMENG TYPE STRING,
KODLL TYPE STRING,
KOJIN TYPE STRING,
KORUE TYPE STRING,
SGT_SCAT TYPE STRING,
FSH_SALLOC_QTY TYPE STRING,
/CWM/SLABS TYPE STRING,
/CWM/SINSM TYPE STRING,
/CWM/SEINM TYPE STRING,
/CWM/SSPEM TYPE STRING,
/CWM/SVMLA TYPE STRING,
/CWM/SVMIN TYPE STRING,
/CWM/SVMEI TYPE STRING,
/CWM/SVMSP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MKOL_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_MKOL_STR-MANDT sy-vline 
WA_MKOL_STR-MATNR sy-vline 
WA_MKOL_STR-WERKS sy-vline 
WA_MKOL_STR-LGORT sy-vline 
WA_MKOL_STR-CHARG sy-vline 
WA_MKOL_STR-SOBKZ sy-vline 
WA_MKOL_STR-LIFNR sy-vline 
WA_MKOL_STR-LVORM sy-vline 
WA_MKOL_STR-ERSDA sy-vline 
WA_MKOL_STR-ERNAM sy-vline 
WA_MKOL_STR-AENAM sy-vline 
WA_MKOL_STR-LAEDA sy-vline 
WA_MKOL_STR-LFGJA sy-vline 
WA_MKOL_STR-LFMON sy-vline 
WA_MKOL_STR-SPERS sy-vline 
WA_MKOL_STR-SLABS sy-vline 
WA_MKOL_STR-SINSM sy-vline 
WA_MKOL_STR-SEINM sy-vline 
WA_MKOL_STR-SSPEM sy-vline 
WA_MKOL_STR-SVMLA sy-vline 
WA_MKOL_STR-SVMIN sy-vline 
WA_MKOL_STR-SVMEI sy-vline 
WA_MKOL_STR-SVMSP sy-vline 
WA_MKOL_STR-KZISL sy-vline 
WA_MKOL_STR-KZISQ sy-vline 
WA_MKOL_STR-KZISE sy-vline 
WA_MKOL_STR-KZISS sy-vline 
WA_MKOL_STR-KZVSL sy-vline 
WA_MKOL_STR-KZVSQ sy-vline 
WA_MKOL_STR-KZVSE sy-vline 
WA_MKOL_STR-KZVSS sy-vline 
WA_MKOL_STR-MMENG sy-vline 
WA_MKOL_STR-AMENG sy-vline 
WA_MKOL_STR-KODLL sy-vline 
WA_MKOL_STR-KOJIN sy-vline 
WA_MKOL_STR-KORUE sy-vline 
WA_MKOL_STR-SGT_SCAT sy-vline 
WA_MKOL_STR-FSH_SALLOC_QTY sy-vline 
WA_MKOL_STR-/CWM/SLABS sy-vline 
WA_MKOL_STR-/CWM/SINSM sy-vline 
WA_MKOL_STR-/CWM/SEINM sy-vline 
WA_MKOL_STR-/CWM/SSPEM sy-vline 
WA_MKOL_STR-/CWM/SVMLA sy-vline 
WA_MKOL_STR-/CWM/SVMIN sy-vline 
WA_MKOL_STR-/CWM/SVMEI sy-vline 
WA_MKOL_STR-/CWM/SVMSP sy-vline      INTO ld_text SEPARATED BY SPACE.

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