ABAP Select data from SAP table /TRP/S_RET into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /TRP/S_RET 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 /TRP/S_RET. 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 /TRP/S_RET 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_/TRP/S_RET TYPE STANDARD TABLE OF /TRP/S_RET,
      WA_/TRP/S_RET TYPE /TRP/S_RET,
      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: </TRP/S_RET> TYPE /TRP/S_RET.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /TRP/S_RET
  INTO TABLE IT_/TRP/S_RET.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /TRP/S_RET
*  INTO TABLE @DATA(IT_/TRP/S_RET2).
*--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_/TRP/S_RET INDEX 1 INTO DATA(WA_/TRP/S_RET2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/TRP/S_RET ASSIGNING </TRP/S_RET>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</TRP/S_RET>-TOR_ID = 1.
</TRP/S_RET>-FOR_ID = 1.
</TRP/S_RET>-AMOUNT = 1.
</TRP/S_RET>-TIME_COST = 1.
</TRP/S_RET>-ERR_MSG = 1.

ENDLOOP.

LOOP AT IT_/TRP/S_RET INTO WA_/TRP/S_RET.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline, ENDLOOP.
   
*Add any further fields from structure WA_/TRP/S_RET 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_/TRP/S_RET 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_/TRP/S_RET INTO WA_/TRP/S_RET.


*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 TOR_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/TRP/S_RET-TOR_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TRP/S_RET-TOR_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FOR_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/TRP/S_RET-FOR_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TRP/S_RET-FOR_ID.
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_/TRP/S_RET_STR, 
TOR_ID TYPE STRING,
FOR_ID TYPE STRING,
AMOUNT TYPE STRING,
TIME_COST TYPE STRING,
ERR_MSG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/TRP/S_RET_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_/TRP/S_RET_STR-TOR_ID sy-vline 
WA_/TRP/S_RET_STR-FOR_ID sy-vline 
WA_/TRP/S_RET_STR-AMOUNT sy-vline 
WA_/TRP/S_RET_STR-TIME_COST sy-vline 
WA_/TRP/S_RET_STR-ERR_MSG sy-vline      INTO ld_text SEPARATED BY SPACE.

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