ABAP Select data from SAP table ITM_CLASS_SEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ITM_CLASS_SEL
*  INTO TABLE @DATA(IT_ITM_CLASS_SEL2).
*--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_ITM_CLASS_SEL INDEX 1 INTO DATA(WA_ITM_CLASS_SEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ITM_CLASS_SEL>-IDENT = 1.
<ITM_CLASS_SEL>-POSNR = 1.
<ITM_CLASS_SEL>-POSTP = 1.
<ITM_CLASS_SEL>-SORTF = 1.
<ITM_CLASS_SEL>-IDNRK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ITM_CLASS_SEL-CLASS, sy-vline,
  WA_ITM_CLASS_SEL-KLART, sy-vline,
  WA_ITM_CLASS_SEL-DOKAR, sy-vline,
  WA_ITM_CLASS_SEL-DOKNR, sy-vline,
  WA_ITM_CLASS_SEL-DOKTL, sy-vline,
  WA_ITM_CLASS_SEL-DOKVR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ITM_CLASS_SEL 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_ITM_CLASS_SEL 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_ITM_CLASS_SEL INTO WA_ITM_CLASS_SEL.


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

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

*Conversion exit ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ITM_CLASS_SEL-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ITM_CLASS_SEL-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_ITM_CLASS_SEL_STR, 
IDENT TYPE STRING,
POSNR TYPE STRING,
POSTP TYPE STRING,
SORTF TYPE STRING,
IDNRK TYPE STRING,
CLASS TYPE STRING,
KLART TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
FREE_SEL_FLG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ITM_CLASS_SEL_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_ITM_CLASS_SEL_STR-IDENT sy-vline 
WA_ITM_CLASS_SEL_STR-POSNR sy-vline 
WA_ITM_CLASS_SEL_STR-POSTP sy-vline 
WA_ITM_CLASS_SEL_STR-SORTF sy-vline 
WA_ITM_CLASS_SEL_STR-IDNRK sy-vline 
WA_ITM_CLASS_SEL_STR-CLASS sy-vline 
WA_ITM_CLASS_SEL_STR-KLART sy-vline 
WA_ITM_CLASS_SEL_STR-DOKAR sy-vline 
WA_ITM_CLASS_SEL_STR-DOKNR sy-vline 
WA_ITM_CLASS_SEL_STR-DOKTL sy-vline 
WA_ITM_CLASS_SEL_STR-DOKVR sy-vline 
WA_ITM_CLASS_SEL_STR-FREE_SEL_FLG sy-vline      INTO ld_text SEPARATED BY SPACE.

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