ABAP Select data from SAP table CLASSX_FLE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CLASSX_FLE
*  INTO TABLE @DATA(IT_CLASSX_FLE2).
*--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_CLASSX_FLE INDEX 1 INTO DATA(WA_CLASSX_FLE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CLASSX_FLE>-KLART = 1.
<CLASSX_FLE>-CLASS = 1.
<CLASSX_FLE>-KLBEZ = 1.
<CLASSX_FLE>-ANZUKZ = 1.
<CLASSX_FLE>-ATNAM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CLASSX_FLE-ATWRT, sy-vline,
  WA_CLASSX_FLE-FORMT, sy-vline,
  WA_CLASSX_FLE-LAENGE, sy-vline,
  WA_CLASSX_FLE-DEZIMA, sy-vline,
  WA_CLASSX_FLE-DIMEN, sy-vline,
  WA_CLASSX_FLE-INHER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CLASSX_FLE 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_CLASSX_FLE 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_CLASSX_FLE INTO WA_CLASSX_FLE.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_CLASSX_FLE_STR, 
KLART TYPE STRING,
CLASS TYPE STRING,
KLBEZ TYPE STRING,
ANZUKZ TYPE STRING,
ATNAM TYPE STRING,
ATWRT TYPE STRING,
FORMT TYPE STRING,
LAENGE TYPE STRING,
DEZIMA TYPE STRING,
DIMEN TYPE STRING,
INHER TYPE STRING,
ABTEI TYPE STRING,
HERKUN TYPE STRING,
DINKBU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CLASSX_FLE_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_CLASSX_FLE_STR-KLART sy-vline 
WA_CLASSX_FLE_STR-CLASS sy-vline 
WA_CLASSX_FLE_STR-KLBEZ sy-vline 
WA_CLASSX_FLE_STR-ANZUKZ sy-vline 
WA_CLASSX_FLE_STR-ATNAM sy-vline 
WA_CLASSX_FLE_STR-ATWRT sy-vline 
WA_CLASSX_FLE_STR-FORMT sy-vline 
WA_CLASSX_FLE_STR-LAENGE sy-vline 
WA_CLASSX_FLE_STR-DEZIMA sy-vline 
WA_CLASSX_FLE_STR-DIMEN sy-vline 
WA_CLASSX_FLE_STR-INHER sy-vline 
WA_CLASSX_FLE_STR-ABTEI sy-vline 
WA_CLASSX_FLE_STR-HERKUN sy-vline 
WA_CLASSX_FLE_STR-DINKBU sy-vline      INTO ld_text SEPARATED BY SPACE.

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