ABAP Select data from SAP table REL_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 REL_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 REL_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 REL_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_REL_CLASS_DATA TYPE STANDARD TABLE OF REL_CLASS_DATA,
      WA_REL_CLASS_DATA TYPE REL_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: <REL_CLASS_DATA> TYPE REL_CLASS_DATA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REL_CLASS_DATA
*  INTO TABLE @DATA(IT_REL_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_REL_CLASS_DATA INDEX 1 INTO DATA(WA_REL_CLASS_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REL_CLASS_DATA>-MANDT = 1.
<REL_CLASS_DATA>-PLNTY = 1.
<REL_CLASS_DATA>-PLNNR = 1.
<REL_CLASS_DATA>-PLNAL = 1.
<REL_CLASS_DATA>-PLNKN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REL_CLASS_DATA-PLNRN, sy-vline,
  WA_REL_CLASS_DATA-ALNRN, sy-vline,
  WA_REL_CLASS_DATA-KNNRN, sy-vline,
  WA_REL_CLASS_DATA-AOBAR, sy-vline,
  WA_REL_CLASS_DATA-MIMAX, sy-vline,
  WA_REL_CLASS_DATA-ZAEHL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REL_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_REL_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_REL_CLASS_DATA INTO WA_REL_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 PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-PLNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-PLNAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNRN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-PLNRN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-PLNRN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALNRN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-ALNRN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-ALNRN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ZEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-ZEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-ZEINH.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field VPLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-VPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-VPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VPLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-VPLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-VPLAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR_AUS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REL_CLASS_DATA-AENNR_AUS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REL_CLASS_DATA-AENNR_AUS.
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_REL_CLASS_DATA_STR, 
MANDT TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNKN TYPE STRING,
PLNRN TYPE STRING,
ALNRN TYPE STRING,
KNNRN TYPE STRING,
AOBAR TYPE STRING,
MIMAX TYPE STRING,
ZAEHL TYPE STRING,
DATUV TYPE STRING,
TECHV TYPE STRING,
AENNR TYPE STRING,
ZEINH TYPE STRING,
DAUER TYPE STRING,
DAUKZ TYPE STRING,
VORNC TYPE STRING,
NCVOR TYPE STRING,
LOEKZ TYPE STRING,
KALID TYPE STRING,
PRZNT TYPE STRING,
PROVG TYPE STRING,
ARBID TYPE STRING,
WERKS TYPE STRING,
ANDAT TYPE STRING,
ANNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
DAUERMAX TYPE STRING,
VALID_TO TYPE STRING,
LOEKZ_INHERITED TYPE STRING,
VORNR TYPE STRING,
VPLTY TYPE STRING,
VPLNR TYPE STRING,
VPLAL TYPE STRING,
IDENT TYPE STRING,
IDENT_REF TYPE STRING,
HERKUNFT TYPE STRING,
DATUB TYPE STRING,
AENNR_AUS TYPE STRING,
FLG_LOCK TYPE STRING,
FLG_TSK_GROUP TYPE STRING,
HANDLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REL_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_REL_CLASS_DATA_STR-MANDT sy-vline 
WA_REL_CLASS_DATA_STR-PLNTY sy-vline 
WA_REL_CLASS_DATA_STR-PLNNR sy-vline 
WA_REL_CLASS_DATA_STR-PLNAL sy-vline 
WA_REL_CLASS_DATA_STR-PLNKN sy-vline 
WA_REL_CLASS_DATA_STR-PLNRN sy-vline 
WA_REL_CLASS_DATA_STR-ALNRN sy-vline 
WA_REL_CLASS_DATA_STR-KNNRN sy-vline 
WA_REL_CLASS_DATA_STR-AOBAR sy-vline 
WA_REL_CLASS_DATA_STR-MIMAX sy-vline 
WA_REL_CLASS_DATA_STR-ZAEHL sy-vline 
WA_REL_CLASS_DATA_STR-DATUV sy-vline 
WA_REL_CLASS_DATA_STR-TECHV sy-vline 
WA_REL_CLASS_DATA_STR-AENNR sy-vline 
WA_REL_CLASS_DATA_STR-ZEINH sy-vline 
WA_REL_CLASS_DATA_STR-DAUER sy-vline 
WA_REL_CLASS_DATA_STR-DAUKZ sy-vline 
WA_REL_CLASS_DATA_STR-VORNC sy-vline 
WA_REL_CLASS_DATA_STR-NCVOR sy-vline 
WA_REL_CLASS_DATA_STR-LOEKZ sy-vline 
WA_REL_CLASS_DATA_STR-KALID sy-vline 
WA_REL_CLASS_DATA_STR-PRZNT sy-vline 
WA_REL_CLASS_DATA_STR-PROVG sy-vline 
WA_REL_CLASS_DATA_STR-ARBID sy-vline 
WA_REL_CLASS_DATA_STR-WERKS sy-vline 
WA_REL_CLASS_DATA_STR-ANDAT sy-vline 
WA_REL_CLASS_DATA_STR-ANNAM sy-vline 
WA_REL_CLASS_DATA_STR-AEDAT sy-vline 
WA_REL_CLASS_DATA_STR-AENAM sy-vline 
WA_REL_CLASS_DATA_STR-DAUERMAX sy-vline 
WA_REL_CLASS_DATA_STR-VALID_TO sy-vline 
WA_REL_CLASS_DATA_STR-LOEKZ_INHERITED sy-vline 
WA_REL_CLASS_DATA_STR-VORNR sy-vline 
WA_REL_CLASS_DATA_STR-VPLTY sy-vline 
WA_REL_CLASS_DATA_STR-VPLNR sy-vline 
WA_REL_CLASS_DATA_STR-VPLAL sy-vline 
WA_REL_CLASS_DATA_STR-IDENT sy-vline 
WA_REL_CLASS_DATA_STR-IDENT_REF sy-vline 
WA_REL_CLASS_DATA_STR-HERKUNFT sy-vline 
WA_REL_CLASS_DATA_STR-DATUB sy-vline 
WA_REL_CLASS_DATA_STR-AENNR_AUS sy-vline 
WA_REL_CLASS_DATA_STR-FLG_LOCK sy-vline 
WA_REL_CLASS_DATA_STR-FLG_TSK_GROUP sy-vline 
WA_REL_CLASS_DATA_STR-HANDLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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