ABAP Select data from SAP table KLMERKA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLMERKA
*  INTO TABLE @DATA(IT_KLMERKA2).
*--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_KLMERKA INDEX 1 INTO DATA(WA_KLMERKA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLMERKA>-ATNAM = 1.
<KLMERKA>-ATBEZ = 1.
<KLMERKA>-ATERF = 1.
<KLMERKA>-DIMEN = 1.
<KLMERKA>-ATFOR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLMERKA-ANZST, sy-vline,
  WA_KLMERKA-ANZDZ, sy-vline,
  WA_KLMERKA-ATSCH, sy-vline,
  WA_KLMERKA-DINKB, sy-vline,
  WA_KLMERKA-ABTEI, sy-vline,
  WA_KLMERKA-HERKU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLMERKA 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_KLMERKA 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_KLMERKA INTO WA_KLMERKA.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_KLMERKA-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLMERKA-ATINN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ATINN, internal->external for field ATINO
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_KLMERKA-ATINO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLMERKA-ATINO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KLMERKA-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLMERKA-DOKNR.
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_KLMERKA_STR, 
ATNAM TYPE STRING,
ATBEZ TYPE STRING,
ATERF TYPE STRING,
DIMEN TYPE STRING,
ATFOR TYPE STRING,
ANZST TYPE STRING,
ANZDZ TYPE STRING,
ATSCH TYPE STRING,
DINKB TYPE STRING,
ABTEI TYPE STRING,
HERKU TYPE STRING,
ATVOR TYPE STRING,
ATEIN TYPE STRING,
ATINT TYPE STRING,
ATWRD TYPE STRING,
ATVSC TYPE STRING,
ATFOD TYPE STRING,
ATKLE TYPE STRING,
ATTAB TYPE STRING,
ATFEL TYPE STRING,
ATTEI TYPE STRING,
ATINN TYPE STRING,
ATINO TYPE STRING,
WERKS TYPE STRING,
KATALOGART TYPE STRING,
AUSWAHLMGE TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
KNOBJ TYPE STRING,
DTYPE TYPE STRING,
SELRE TYPE STRING,
DRURE TYPE STRING,
ANZRE TYPE STRING,
ATVIE TYPE STRING,
ATINP TYPE STRING,
INDRE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLMERKA_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_KLMERKA_STR-ATNAM sy-vline 
WA_KLMERKA_STR-ATBEZ sy-vline 
WA_KLMERKA_STR-ATERF sy-vline 
WA_KLMERKA_STR-DIMEN sy-vline 
WA_KLMERKA_STR-ATFOR sy-vline 
WA_KLMERKA_STR-ANZST sy-vline 
WA_KLMERKA_STR-ANZDZ sy-vline 
WA_KLMERKA_STR-ATSCH sy-vline 
WA_KLMERKA_STR-DINKB sy-vline 
WA_KLMERKA_STR-ABTEI sy-vline 
WA_KLMERKA_STR-HERKU sy-vline 
WA_KLMERKA_STR-ATVOR sy-vline 
WA_KLMERKA_STR-ATEIN sy-vline 
WA_KLMERKA_STR-ATINT sy-vline 
WA_KLMERKA_STR-ATWRD sy-vline 
WA_KLMERKA_STR-ATVSC sy-vline 
WA_KLMERKA_STR-ATFOD sy-vline 
WA_KLMERKA_STR-ATKLE sy-vline 
WA_KLMERKA_STR-ATTAB sy-vline 
WA_KLMERKA_STR-ATFEL sy-vline 
WA_KLMERKA_STR-ATTEI sy-vline 
WA_KLMERKA_STR-ATINN sy-vline 
WA_KLMERKA_STR-ATINO sy-vline 
WA_KLMERKA_STR-WERKS sy-vline 
WA_KLMERKA_STR-KATALOGART sy-vline 
WA_KLMERKA_STR-AUSWAHLMGE sy-vline 
WA_KLMERKA_STR-DOKAR sy-vline 
WA_KLMERKA_STR-DOKNR sy-vline 
WA_KLMERKA_STR-DOKVR sy-vline 
WA_KLMERKA_STR-DOKTL sy-vline 
WA_KLMERKA_STR-KNOBJ sy-vline 
WA_KLMERKA_STR-DTYPE sy-vline 
WA_KLMERKA_STR-SELRE sy-vline 
WA_KLMERKA_STR-DRURE sy-vline 
WA_KLMERKA_STR-ANZRE sy-vline 
WA_KLMERKA_STR-ATVIE sy-vline 
WA_KLMERKA_STR-ATINP sy-vline 
WA_KLMERKA_STR-INDRE sy-vline      INTO ld_text SEPARATED BY SPACE.

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