ABAP Select data from SAP table RPAPP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RPAPP
*  INTO TABLE @DATA(IT_RPAPP2).
*--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_RPAPP INDEX 1 INTO DATA(WA_RPAPP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RPAPP>-APLNO = 1.
<RPAPP>-RECTK = 1.
<RPAPP>-DTKNZ = 1.
<RPAPP>-ENAME = 1.
<RPAPP>-ENAME1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RPAPP-ENAME2, sy-vline,
  WA_RPAPP-BEGDA, sy-vline,
  WA_RPAPP-OFFID, sy-vline,
  WA_RPAPP-INAME, sy-vline,
  WA_RPAPP-ASHTX, sy-vline,
  WA_RPAPP-ACTTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RPAPP 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_RPAPP 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_RPAPP INTO WA_RPAPP.


*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_RPAPP_STR, 
APLNO TYPE STRING,
RECTK TYPE STRING,
DTKNZ TYPE STRING,
ENAME TYPE STRING,
ENAME1 TYPE STRING,
ENAME2 TYPE STRING,
BEGDA TYPE STRING,
OFFID TYPE STRING,
INAME TYPE STRING,
ASHTX TYPE STRING,
ACTTX TYPE STRING,
FINSH TYPE STRING,
PLAND TYPE STRING,
REFER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RPAPP_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_RPAPP_STR-APLNO sy-vline 
WA_RPAPP_STR-RECTK sy-vline 
WA_RPAPP_STR-DTKNZ sy-vline 
WA_RPAPP_STR-ENAME sy-vline 
WA_RPAPP_STR-ENAME1 sy-vline 
WA_RPAPP_STR-ENAME2 sy-vline 
WA_RPAPP_STR-BEGDA sy-vline 
WA_RPAPP_STR-OFFID sy-vline 
WA_RPAPP_STR-INAME sy-vline 
WA_RPAPP_STR-ASHTX sy-vline 
WA_RPAPP_STR-ACTTX sy-vline 
WA_RPAPP_STR-FINSH sy-vline 
WA_RPAPP_STR-PLAND sy-vline 
WA_RPAPP_STR-REFER sy-vline      INTO ld_text SEPARATED BY SPACE.

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