ABAP Select data from SAP table /SAPCEM/KLMERKA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPCEM/KLMERKA
*  INTO TABLE @DATA(IT_/SAPCEM/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_/SAPCEM/KLMERKA INDEX 1 INTO DATA(WA_/SAPCEM/KLMERKA2).


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

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

ENDLOOP.

LOOP AT IT_/SAPCEM/KLMERKA INTO WA_/SAPCEM/KLMERKA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPCEM/KLMERKA-ANZST, sy-vline,
  WA_/SAPCEM/KLMERKA-ANZDZ, sy-vline,
  WA_/SAPCEM/KLMERKA-ATSCH, sy-vline,
  WA_/SAPCEM/KLMERKA-DINKB, sy-vline,
  WA_/SAPCEM/KLMERKA-ABTEI, sy-vline,
  WA_/SAPCEM/KLMERKA-HERKU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPCEM/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_/SAPCEM/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_/SAPCEM/KLMERKA INTO WA_/SAPCEM/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_/SAPCEM/KLMERKA-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPCEM/KLMERKA-ATINN.
WRITE:/ 'New Value:', ld_input.

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

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

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