ABAP Select data from SAP table ETRF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ETRF
*  INTO TABLE @DATA(IT_ETRF2).
*--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_ETRF INDEX 1 INTO DATA(WA_ETRF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ETRF>-MANDT = 1.
<ETRF>-TARIFNR = 1.
<ETRF>-SPARTE = 1.
<ETRF>-AKLASSE = 1.
<ETRF>-OPERAND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ETRF-USE_REGIST, sy-vline,
  WA_ETRF-USE_RTP, sy-vline,
  WA_ETRF-USE_DEVICE, sy-vline,
  WA_ETRF-USE_FACTS, sy-vline,
  WA_ETRF-USE_PEB, sy-vline,
  WA_ETRF-USE_WASTE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ETRF 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_ETRF 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_ETRF INTO WA_ETRF.


*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_ETRF_STR, 
MANDT TYPE STRING,
TARIFNR TYPE STRING,
SPARTE TYPE STRING,
AKLASSE TYPE STRING,
OPERAND 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,
MINPROZ TYPE STRING,
PRUEFKL TYPE STRING,
RTPINTERFACE TYPE STRING,
RTPCATEGORY TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
BEGRU TYPE STRING,
LOEVM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ETRF_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_ETRF_STR-MANDT sy-vline 
WA_ETRF_STR-TARIFNR sy-vline 
WA_ETRF_STR-SPARTE sy-vline 
WA_ETRF_STR-AKLASSE sy-vline 
WA_ETRF_STR-OPERAND sy-vline 
WA_ETRF_STR-USE_REGIST sy-vline 
WA_ETRF_STR-USE_RTP sy-vline 
WA_ETRF_STR-USE_DEVICE sy-vline 
WA_ETRF_STR-USE_FACTS sy-vline 
WA_ETRF_STR-USE_PEB sy-vline 
WA_ETRF_STR-USE_WASTE sy-vline 
WA_ETRF_STR-MINPROZ sy-vline 
WA_ETRF_STR-PRUEFKL sy-vline 
WA_ETRF_STR-RTPINTERFACE sy-vline 
WA_ETRF_STR-RTPCATEGORY sy-vline 
WA_ETRF_STR-ERDAT sy-vline 
WA_ETRF_STR-ERNAM sy-vline 
WA_ETRF_STR-AEDAT sy-vline 
WA_ETRF_STR-AENAM sy-vline 
WA_ETRF_STR-BEGRU sy-vline 
WA_ETRF_STR-LOEVM sy-vline      INTO ld_text SEPARATED BY SPACE.

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