ABAP Select data from SAP table SKM1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SKM1 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 SKM1. 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 SKM1 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_SKM1 TYPE STANDARD TABLE OF SKM1,
      WA_SKM1 TYPE SKM1,
      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: <SKM1> TYPE SKM1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_SKM1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM SKM1
  INTO TABLE IT_SKM1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SKM1
*  INTO TABLE @DATA(IT_SKM12).
*--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_SKM1 INDEX 1 INTO DATA(WA_SKM12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_SKM1 ASSIGNING <SKM1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SKM1>-MANDT = 1.
<SKM1>-KTOPL = 1.
<SKM1>-MUSTR = 1.
<SKM1>-BEGRU = 1.
<SKM1>-BUSAB = 1.

ENDLOOP.

LOOP AT IT_SKM1 INTO WA_SKM1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SKM1-DATLZ, sy-vline,
  WA_SKM1-ERDAT, sy-vline,
  WA_SKM1-ERNAM, sy-vline,
  WA_SKM1-FDGRV, sy-vline,
  WA_SKM1-FDLEV, sy-vline,
  WA_SKM1-FIPLS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SKM1 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_SKM1 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_SKM1 INTO WA_SKM1.


*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 MUSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_SKM1-MUSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SKM1-MUSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FDGRV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_SKM1-FDGRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SKM1-FDGRV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALTKT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_SKM1-ALTKT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SKM1-ALTKT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_SKM1-RECID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SKM1-RECID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit FMCIS, internal->external for field FIPOS
CALL FUNCTION 'CONVERSION_EXIT_FMCIS_OUTPUT'
  EXPORTING
    input =                      WA_SKM1-FIPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SKM1-FIPOS.
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_SKM1_STR, 
MANDT TYPE STRING,
KTOPL TYPE STRING,
MUSTR TYPE STRING,
BEGRU TYPE STRING,
BUSAB TYPE STRING,
DATLZ TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
FDGRV TYPE STRING,
FDLEV TYPE STRING,
FIPLS TYPE STRING,
FSTAG TYPE STRING,
HBKID TYPE STRING,
HKTID TYPE STRING,
KDFSL TYPE STRING,
MITKZ TYPE STRING,
MWSKZ TYPE STRING,
STEXT TYPE STRING,
VZSKZ TYPE STRING,
WAERS TYPE STRING,
WMETH TYPE STRING,
XGKON TYPE STRING,
XINTB TYPE STRING,
XKRES TYPE STRING,
XNKON TYPE STRING,
XOPVW TYPE STRING,
ZINDT TYPE STRING,
ZINRT TYPE STRING,
ZUAWA TYPE STRING,
ALTKT TYPE STRING,
XMITK TYPE STRING,
RECID TYPE STRING,
FIPOS TYPE STRING,
XMWNO TYPE STRING,
XSALH TYPE STRING,
BEWGP TYPE STRING,
INFKY TYPE STRING,
XLGCLR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SKM1_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_SKM1_STR-MANDT sy-vline 
WA_SKM1_STR-KTOPL sy-vline 
WA_SKM1_STR-MUSTR sy-vline 
WA_SKM1_STR-BEGRU sy-vline 
WA_SKM1_STR-BUSAB sy-vline 
WA_SKM1_STR-DATLZ sy-vline 
WA_SKM1_STR-ERDAT sy-vline 
WA_SKM1_STR-ERNAM sy-vline 
WA_SKM1_STR-FDGRV sy-vline 
WA_SKM1_STR-FDLEV sy-vline 
WA_SKM1_STR-FIPLS sy-vline 
WA_SKM1_STR-FSTAG sy-vline 
WA_SKM1_STR-HBKID sy-vline 
WA_SKM1_STR-HKTID sy-vline 
WA_SKM1_STR-KDFSL sy-vline 
WA_SKM1_STR-MITKZ sy-vline 
WA_SKM1_STR-MWSKZ sy-vline 
WA_SKM1_STR-STEXT sy-vline 
WA_SKM1_STR-VZSKZ sy-vline 
WA_SKM1_STR-WAERS sy-vline 
WA_SKM1_STR-WMETH sy-vline 
WA_SKM1_STR-XGKON sy-vline 
WA_SKM1_STR-XINTB sy-vline 
WA_SKM1_STR-XKRES sy-vline 
WA_SKM1_STR-XNKON sy-vline 
WA_SKM1_STR-XOPVW sy-vline 
WA_SKM1_STR-ZINDT sy-vline 
WA_SKM1_STR-ZINRT sy-vline 
WA_SKM1_STR-ZUAWA sy-vline 
WA_SKM1_STR-ALTKT sy-vline 
WA_SKM1_STR-XMITK sy-vline 
WA_SKM1_STR-RECID sy-vline 
WA_SKM1_STR-FIPOS sy-vline 
WA_SKM1_STR-XMWNO sy-vline 
WA_SKM1_STR-XSALH sy-vline 
WA_SKM1_STR-BEWGP sy-vline 
WA_SKM1_STR-INFKY sy-vline 
WA_SKM1_STR-XLGCLR sy-vline      INTO ld_text SEPARATED BY SPACE.

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