ABAP Select data from SAP table ERTFND_DISP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ERTFND_DISP
*  INTO TABLE @DATA(IT_ERTFND_DISP2).
*--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_ERTFND_DISP INDEX 1 INTO DATA(WA_ERTFND_DISP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ERTFND_DISP>-TARIFTYP = 1.
<ERTFND_DISP>-TARIFART = 1.
<ERTFND_DISP>-AB = 1.
<ERTFND_DISP>-BIS = 1.
<ERTFND_DISP>-LFDNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ERTFND_DISP-SPARTE, sy-vline,
  WA_ERTFND_DISP-AKLASSE, sy-vline,
  WA_ERTFND_DISP-TARIFNR, sy-vline,
  WA_ERTFND_DISP-USE_REGIST, sy-vline,
  WA_ERTFND_DISP-USE_RTP, sy-vline,
  WA_ERTFND_DISP-USE_DEVICE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ERTFND_DISP 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_ERTFND_DISP 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_ERTFND_DISP INTO WA_ERTFND_DISP.


*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_ERTFND_DISP_STR, 
TARIFTYP TYPE STRING,
TARIFART TYPE STRING,
AB TYPE STRING,
BIS TYPE STRING,
LFDNR TYPE STRING,
SPARTE TYPE STRING,
AKLASSE TYPE STRING,
TARIFNR TYPE STRING,
USE_REGIST TYPE STRING,
USE_RTP TYPE STRING,
USE_DEVICE TYPE STRING,
USE_FACTS TYPE STRING,
USE_PEB TYPE STRING,
USE_WASTE TYPE STRING,
ESTI_ANL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ERTFND_DISP_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_ERTFND_DISP_STR-TARIFTYP sy-vline 
WA_ERTFND_DISP_STR-TARIFART sy-vline 
WA_ERTFND_DISP_STR-AB sy-vline 
WA_ERTFND_DISP_STR-BIS sy-vline 
WA_ERTFND_DISP_STR-LFDNR sy-vline 
WA_ERTFND_DISP_STR-SPARTE sy-vline 
WA_ERTFND_DISP_STR-AKLASSE sy-vline 
WA_ERTFND_DISP_STR-TARIFNR sy-vline 
WA_ERTFND_DISP_STR-USE_REGIST sy-vline 
WA_ERTFND_DISP_STR-USE_RTP sy-vline 
WA_ERTFND_DISP_STR-USE_DEVICE sy-vline 
WA_ERTFND_DISP_STR-USE_FACTS sy-vline 
WA_ERTFND_DISP_STR-USE_PEB sy-vline 
WA_ERTFND_DISP_STR-USE_WASTE sy-vline 
WA_ERTFND_DISP_STR-ESTI_ANL sy-vline      INTO ld_text SEPARATED BY SPACE.

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