ABAP Select data from SAP table IDOC_TRFC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDOC_TRFC
*  INTO TABLE @DATA(IT_IDOC_TRFC2).
*--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_IDOC_TRFC INDEX 1 INTO DATA(WA_IDOC_TRFC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDOC_TRFC>-DOCNUM = 1.
<IDOC_TRFC>-ARFCIPID = 1.
<IDOC_TRFC>-ARFCPID = 1.
<IDOC_TRFC>-ARFCTIME = 1.
<IDOC_TRFC>-ARFCTIDCNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDOC_TRFC-ARFCDEST, sy-vline,
  WA_IDOC_TRFC-ARFCLUWCNT, sy-vline,
  WA_IDOC_TRFC-ARFCSTATE, sy-vline,
  WA_IDOC_TRFC-ARFCFNAM, sy-vline,
  WA_IDOC_TRFC-ARFCRETURN, sy-vline,
  WA_IDOC_TRFC-ARFCUZEIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDOC_TRFC 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_IDOC_TRFC 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_IDOC_TRFC INTO WA_IDOC_TRFC.


*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_IDOC_TRFC_STR, 
DOCNUM TYPE STRING,
ARFCIPID TYPE STRING,
ARFCPID TYPE STRING,
ARFCTIME TYPE STRING,
ARFCTIDCNT TYPE STRING,
ARFCDEST TYPE STRING,
ARFCLUWCNT TYPE STRING,
ARFCSTATE TYPE STRING,
ARFCFNAM TYPE STRING,
ARFCRETURN TYPE STRING,
ARFCUZEIT TYPE STRING,
ARFCDATUM TYPE STRING,
ARFCUSER TYPE STRING,
ARFCRETRYS TYPE STRING,
ARFCTCODE TYPE STRING,
ARFCRHOST TYPE STRING,
ARFCMSG TYPE STRING,
ARFCRESERV TYPE STRING,
HASH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDOC_TRFC_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_IDOC_TRFC_STR-DOCNUM sy-vline 
WA_IDOC_TRFC_STR-ARFCIPID sy-vline 
WA_IDOC_TRFC_STR-ARFCPID sy-vline 
WA_IDOC_TRFC_STR-ARFCTIME sy-vline 
WA_IDOC_TRFC_STR-ARFCTIDCNT sy-vline 
WA_IDOC_TRFC_STR-ARFCDEST sy-vline 
WA_IDOC_TRFC_STR-ARFCLUWCNT sy-vline 
WA_IDOC_TRFC_STR-ARFCSTATE sy-vline 
WA_IDOC_TRFC_STR-ARFCFNAM sy-vline 
WA_IDOC_TRFC_STR-ARFCRETURN sy-vline 
WA_IDOC_TRFC_STR-ARFCUZEIT sy-vline 
WA_IDOC_TRFC_STR-ARFCDATUM sy-vline 
WA_IDOC_TRFC_STR-ARFCUSER sy-vline 
WA_IDOC_TRFC_STR-ARFCRETRYS sy-vline 
WA_IDOC_TRFC_STR-ARFCTCODE sy-vline 
WA_IDOC_TRFC_STR-ARFCRHOST sy-vline 
WA_IDOC_TRFC_STR-ARFCMSG sy-vline 
WA_IDOC_TRFC_STR-ARFCRESERV sy-vline 
WA_IDOC_TRFC_STR-HASH sy-vline      INTO ld_text SEPARATED BY SPACE.

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