ABAP Select data from SAP table KOMAM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KOMAM
*  INTO TABLE @DATA(IT_KOMAM2).
*--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_KOMAM INDEX 1 INTO DATA(WA_KOMAM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KOMAM>-LIFNR = 1.
<KOMAM>-MATNR = 1.
<KOMAM>-MATKL = 1.
<KOMAM>-INFNR = 1.
<KOMAM>-EKORG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KOMAM-ESOKZ, sy-vline,
  WA_KOMAM-WERKS, sy-vline,
  WA_KOMAM-EVRTN, sy-vline,
  WA_KOMAM-EVRTP, sy-vline,
  WA_KOMAM-EKKOL, sy-vline,
  WA_KOMAM-EKKOA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KOMAM 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_KOMAM 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_KOMAM INTO WA_KOMAM.


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

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

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

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

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

*Conversion exit CUNIT, internal->external for field BSTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KOMAM-BSTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMAM-BSTME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOLIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KOMAM-KOLIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KOMAM-KOLIF.
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_KOMAM_STR, 
LIFNR TYPE STRING,
MATNR TYPE STRING,
MATKL TYPE STRING,
INFNR TYPE STRING,
EKORG TYPE STRING,
ESOKZ TYPE STRING,
WERKS TYPE STRING,
EVRTN TYPE STRING,
EVRTP TYPE STRING,
EKKOL TYPE STRING,
EKKOA TYPE STRING,
MTART TYPE STRING,
LIFRE TYPE STRING,
BSTME TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
RESWK TYPE STRING,
LTSNR TYPE STRING,
KOLIF TYPE STRING,
VARCOND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KOMAM_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_KOMAM_STR-LIFNR sy-vline 
WA_KOMAM_STR-MATNR sy-vline 
WA_KOMAM_STR-MATKL sy-vline 
WA_KOMAM_STR-INFNR sy-vline 
WA_KOMAM_STR-EKORG sy-vline 
WA_KOMAM_STR-ESOKZ sy-vline 
WA_KOMAM_STR-WERKS sy-vline 
WA_KOMAM_STR-EVRTN sy-vline 
WA_KOMAM_STR-EVRTP sy-vline 
WA_KOMAM_STR-EKKOL sy-vline 
WA_KOMAM_STR-EKKOA sy-vline 
WA_KOMAM_STR-MTART sy-vline 
WA_KOMAM_STR-LIFRE sy-vline 
WA_KOMAM_STR-BSTME sy-vline 
WA_KOMAM_STR-INCO1 sy-vline 
WA_KOMAM_STR-INCO2 sy-vline 
WA_KOMAM_STR-RESWK sy-vline 
WA_KOMAM_STR-LTSNR sy-vline 
WA_KOMAM_STR-KOLIF sy-vline 
WA_KOMAM_STR-VARCOND sy-vline      INTO ld_text SEPARATED BY SPACE.

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