ABAP Select data from SAP table KBM_CLASS_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KBM_CLASS_DATA
*  INTO TABLE @DATA(IT_KBM_CLASS_DATA2).
*--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_KBM_CLASS_DATA INDEX 1 INTO DATA(WA_KBM_CLASS_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KBM_CLASS_DATA>-MANDT = 1.
<KBM_CLASS_DATA>-VBELN = 1.
<KBM_CLASS_DATA>-VBPOS = 1.
<KBM_CLASS_DATA>-MATNR = 1.
<KBM_CLASS_DATA>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KBM_CLASS_DATA-STLAN, sy-vline,
  WA_KBM_CLASS_DATA-STLNR, sy-vline,
  WA_KBM_CLASS_DATA-STLAL, sy-vline,
  WA_KBM_CLASS_DATA-ANDAT, sy-vline,
  WA_KBM_CLASS_DATA-ANNAM, sy-vline,
  WA_KBM_CLASS_DATA-AEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KBM_CLASS_DATA 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_KBM_CLASS_DATA 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_KBM_CLASS_DATA INTO WA_KBM_CLASS_DATA.


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

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

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_KBM_CLASS_DATA-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KBM_CLASS_DATA-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KBM_CLASS_DATA-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KBM_CLASS_DATA-STLAL.
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_KBM_CLASS_DATA_STR, 
MANDT TYPE STRING,
VBELN TYPE STRING,
VBPOS TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
STLAN TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
ANDAT TYPE STRING,
ANNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KBM_CLASS_DATA_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_KBM_CLASS_DATA_STR-MANDT sy-vline 
WA_KBM_CLASS_DATA_STR-VBELN sy-vline 
WA_KBM_CLASS_DATA_STR-VBPOS sy-vline 
WA_KBM_CLASS_DATA_STR-MATNR sy-vline 
WA_KBM_CLASS_DATA_STR-WERKS sy-vline 
WA_KBM_CLASS_DATA_STR-STLAN sy-vline 
WA_KBM_CLASS_DATA_STR-STLNR sy-vline 
WA_KBM_CLASS_DATA_STR-STLAL sy-vline 
WA_KBM_CLASS_DATA_STR-ANDAT sy-vline 
WA_KBM_CLASS_DATA_STR-ANNAM sy-vline 
WA_KBM_CLASS_DATA_STR-AEDAT sy-vline 
WA_KBM_CLASS_DATA_STR-AENAM sy-vline      INTO ld_text SEPARATED BY SPACE.

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