ABAP Select data from SAP table DICLASS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DICLASS
*  INTO TABLE @DATA(IT_DICLASS2).
*--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_DICLASS INDEX 1 INTO DATA(WA_DICLASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DICLASS>-MANDT = 1.
<DICLASS>-CLINT = 1.
<DICLASS>-KLART = 1.
<DICLASS>-CLASS = 1.
<DICLASS>-KLBEZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DICLASS-ANZSM, sy-vline,
  WA_DICLASS-ANZAU, sy-vline,
  WA_DICLASS-BGRKP, sy-vline,
  WA_DICLASS-BGRKL, sy-vline,
  WA_DICLASS-BGRSE, sy-vline,
  WA_DICLASS-STDCL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DICLASS 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_DICLASS 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_DICLASS INTO WA_DICLASS.


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

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_DICLASS-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DICLASS-TPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QMNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DICLASS-QMNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DICLASS-QMNUM.
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_DICLASS_STR, 
MANDT TYPE STRING,
CLINT TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
KLBEZ TYPE STRING,
ANZSM TYPE STRING,
ANZAU TYPE STRING,
BGRKP TYPE STRING,
BGRKL TYPE STRING,
BGRSE TYPE STRING,
STDCL TYPE STRING,
STATU TYPE STRING,
VWSTL TYPE STRING,
VWPLA TYPE STRING,
EQUNR TYPE STRING,
TPLNR TYPE STRING,
QMNUM TYPE STRING,
FENUM TYPE STRING,
TRPNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DICLASS_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_DICLASS_STR-MANDT sy-vline 
WA_DICLASS_STR-CLINT sy-vline 
WA_DICLASS_STR-KLART sy-vline 
WA_DICLASS_STR-CLASS sy-vline 
WA_DICLASS_STR-KLBEZ sy-vline 
WA_DICLASS_STR-ANZSM sy-vline 
WA_DICLASS_STR-ANZAU sy-vline 
WA_DICLASS_STR-BGRKP sy-vline 
WA_DICLASS_STR-BGRKL sy-vline 
WA_DICLASS_STR-BGRSE sy-vline 
WA_DICLASS_STR-STDCL sy-vline 
WA_DICLASS_STR-STATU sy-vline 
WA_DICLASS_STR-VWSTL sy-vline 
WA_DICLASS_STR-VWPLA sy-vline 
WA_DICLASS_STR-EQUNR sy-vline 
WA_DICLASS_STR-TPLNR sy-vline 
WA_DICLASS_STR-QMNUM sy-vline 
WA_DICLASS_STR-FENUM sy-vline 
WA_DICLASS_STR-TRPNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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