ABAP Select data from SAP table ERTPINTERFACE_KEY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ERTPINTERFACE_KEY
*  INTO TABLE @DATA(IT_ERTPINTERFACE_KEY2).
*--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_ERTPINTERFACE_KEY INDEX 1 INTO DATA(WA_ERTPINTERFACE_KEY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ERTPINTERFACE_KEY>-MANDT = 1.
<ERTPINTERFACE_KEY>-RTPINTERFACE = 1.
<ERTPINTERFACE_KEY>-SPRAS = 1.
<ERTPINTERFACE_KEY>-RESULTNO = 1.
<ERTPINTERFACE_KEY>-RTPCOMP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ERTPINTERFACE_KEY-DATEFROM, sy-vline,
  WA_ERTPINTERFACE_KEY-TIMEFROM, sy-vline,
  WA_ERTPINTERFACE_KEY-PARNUMBER, sy-vline,
  WA_ERTPINTERFACE_KEY-RTPCOMPCODE, sy-vline,
  WA_ERTPINTERFACE_KEY-OBJNAME, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_ERTPINTERFACE_KEY 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_ERTPINTERFACE_KEY 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_ERTPINTERFACE_KEY INTO WA_ERTPINTERFACE_KEY.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_ERTPINTERFACE_KEY-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERTPINTERFACE_KEY-SPRAS.
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_ERTPINTERFACE_KEY_STR, 
MANDT TYPE STRING,
RTPINTERFACE TYPE STRING,
SPRAS TYPE STRING,
RESULTNO TYPE STRING,
RTPCOMP TYPE STRING,
DATEFROM TYPE STRING,
TIMEFROM TYPE STRING,
PARNUMBER TYPE STRING,
RTPCOMPCODE TYPE STRING,
OBJNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ERTPINTERFACE_KEY_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_ERTPINTERFACE_KEY_STR-MANDT sy-vline 
WA_ERTPINTERFACE_KEY_STR-RTPINTERFACE sy-vline 
WA_ERTPINTERFACE_KEY_STR-SPRAS sy-vline 
WA_ERTPINTERFACE_KEY_STR-RESULTNO sy-vline 
WA_ERTPINTERFACE_KEY_STR-RTPCOMP sy-vline 
WA_ERTPINTERFACE_KEY_STR-DATEFROM sy-vline 
WA_ERTPINTERFACE_KEY_STR-TIMEFROM sy-vline 
WA_ERTPINTERFACE_KEY_STR-PARNUMBER sy-vline 
WA_ERTPINTERFACE_KEY_STR-RTPCOMPCODE sy-vline 
WA_ERTPINTERFACE_KEY_STR-OBJNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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